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Java : Double with Examples

Last Modified : December 31, 2023 Published : March 24, 2022

Double (Java SE 18 & JDK 18) API Examples.
You will find code examples on most Double methods.


Summary

The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.

Double (Java SE 18 & JDK 18)

Class diagram

// Compile error.
final var list = new ArrayList<double>();

// OK.
final var list = new ArrayList<Double>();
list.add(1.11);
list.add(2.22);
list.add(3.33);

System.out.println(list); // [1.11, 2.22, 3.33]

Fields

static final int BYTES

The number of bytes used to represent a double value.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.BYTES); // 8

static final int MAX_EXPONENT

Maximum exponent a finite double variable may have.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.MAX_EXPONENT); // 1023

static final double MAX_VALUE

A constant holding the largest positive finite value of type double, (2-2-52)·21023.

Double (Java SE 18 & JDK 18) 
// 1.7976931348623157E308
System.out.println(Double.MAX_VALUE);

// 179769313486231570814527423731704356798070567525844996598917
// 476803157260780028538760589558632766878171540458953514382464
// 234321326889464182768467546703537516986049910576551282076245
// 490090389328944075868508455133942304583236903222948165808559
// 332123348274797826204144723168738177180919299881250404026184
// 124858368
System.out.println(new BigDecimal(Double.MAX_VALUE).toPlainString());

static final int MIN_EXPONENT

Minimum exponent a normalized double variable may have.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.MIN_EXPONENT); // -1022

static final double MIN_NORMAL

A constant holding the smallest positive normal value of type double, 2-1022.

Double (Java SE 18 & JDK 18) 
// 2.2250738585072014E-308
System.out.println(Double.MIN_NORMAL);

// 0.0000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000222507385850720138309023271733240406421921598046233
// 183055332741688720443481391819585428315901251102056406733973
// 103581100515243416155346010885601238537771882113077799353200
// 233047961014744258363607192156504694250373420837525080665061
// 665815894872049117996859163964850063590877011830487479978088
// 775374994945158045160505091539985658247081864511353793580499
// 211598108576605199243335211435239014879569960959128889160299
// 264151106346631339366347758651302937176204732563178148566435
// 087212282863764204484681140761391147706280168985324411002416
// 144742161856716615054015428508471675290190316132277889672970
// 737312333408698898317506783884692609277397797285865965494109
// 136909540613646756870239867831529068098461721092462539672851
// 5625
System.out.println(new BigDecimal(Double.MIN_NORMAL).toPlainString());

static final double MIN_VALUE

A constant holding the smallest positive nonzero value of type double, 2-1074.

Double (Java SE 18 & JDK 18) 
// 4.9E-324
System.out.println(Double.MIN_VALUE);

// 0.0000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000000000000000000000000000000000000000
// 000000000000000000000000049406564584124654417656879286822137
// 236505980261432476442558568250067550727020875186529983636163
// 599237979656469544571773092665671035593979639877479601078187
// 812630071319031140452784581716784898210368871863605699873072
// 305000638740915356498438731247339727316961514003171538539807
// 412623856559117102665855668676818703956031062493194527159149
// 245532930545654440112748012970999954193198940908041656332452
// 475714786901472678015935523861155013480352649347201937902681
// 071074917033322268447533357208324319360923828934583680601060
// 115061698097530783422773183292479049825247307763759272478746
// 560847782037344696995336470179726777175851256605511991315048
// 911014510378627381672509558373897335989936648099411642057026
// 37090279242767544565229087538682506419718265533447265625
System.out.println(new BigDecimal(Double.MIN_VALUE).toPlainString());

static final double NaN

A constant holding a Not-a-Number (NaN) value of type double.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.NaN); // NaN

static final double NEGATIVE_INFINITY

A constant holding the negative infinity of type double.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.NEGATIVE_INFINITY); // -Infinity

static final double POSITIVE_INFINITY

A constant holding the positive infinity of type double.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.POSITIVE_INFINITY); // Infinity

static final int SIZE

The number of bits used to represent a double value.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.SIZE); // 64

static final Class<Double> TYPE

The Class instance representing the primitive type double.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.TYPE.getName()); // double
System.out.println(Double.TYPE.isPrimitive()); // true

Constructors

Double (double value)

Deprecated, for removal: This API element is subject to removal in a future version. It is rarely appropriate to use this constructor.

Double (Java SE 18 & JDK 18)

Deprecated. Use valueOf(double d) instead.

Double (String s)

Deprecated, for removal: This API element is subject to removal in a future version. It is rarely appropriate to use this constructor.

Double (Java SE 18 & JDK 18)

Deprecated. Use valueOf(String s) instead.

Methods

byte byteValue ()

Returns the value of this Double as a byte after a narrowing primitive conversion.

Double (Java SE 18 & JDK 18) 
final byte value1 = Double.valueOf(100.0).byteValue();
System.out.println(value1); // 100

final byte value2 = Double.valueOf(22.222).byteValue();
System.out.println(value2); // 22

final byte value3 = Double.valueOf(9.99).byteValue();
System.out.println(value3); // 9

System.out.println(Byte.MAX_VALUE); // 127
System.out.println(Byte.MIN_VALUE); // -128

final byte value1 = Double.valueOf(127.0).byteValue();
System.out.println(value1); // 127

final byte value2 = Double.valueOf(128.0).byteValue();
System.out.println(value2); // -128

final byte value3 = Double.valueOf(-128.0).byteValue();
System.out.println(value3); // -128

final byte value4 = Double.valueOf(-129.0).byteValue();
System.out.println(value4); // 127

final byte value1 = Double.valueOf(Double.NaN).byteValue();
System.out.println(value1); // 0

final byte value2 = Double.valueOf(Double.NEGATIVE_INFINITY).byteValue();
System.out.println(value2); // 0

final byte value3 = Double.valueOf(Double.POSITIVE_INFINITY).byteValue();
System.out.println(value3); // -1

static int compare (double d1, double d2)

Compares the two specified double values.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.compare(1.23, 4.56)); // -1
System.out.println(Double.compare(4.56, 1.23)); // 1

System.out.println(Double.compare(1.23, -1.23)); // 1
System.out.println(Double.compare(-1.23, 1.23)); // -1

System.out.println(Double.compare(0.0, -0.0)); // 1
System.out.println(Double.compare(-0.0, 0.0)); // -1

System.out.println(Double.compare(Double.NaN, 1.23)); // 1
System.out.println(Double.compare(Double.NEGATIVE_INFINITY, 1.23)); // -1
System.out.println(Double.compare(Double.POSITIVE_INFINITY, 1.23)); // 1

int compareTo (Double anotherDouble)

Compares two Double objects numerically.

Double (Java SE 18 & JDK 18) 
final var d1 = Double.valueOf(1.23);
final var d2 = Double.valueOf(4.56);

System.out.println(d1.compareTo(d2)); // -1
System.out.println(d2.compareTo(d1)); // 1

final var d1 = Double.valueOf(1.23);
final var d2 = Double.valueOf(-1.23);

System.out.println(d1.compareTo(d2)); // 1
System.out.println(d2.compareTo(d1)); // -1

final var d1 = Double.valueOf(0.0);
final var d2 = Double.valueOf(-0.0);

System.out.println(d1.compareTo(d2)); // 1
System.out.println(d2.compareTo(d1)); // -1

final var d = Double.valueOf(1.23);

System.out.println(d.compareTo(Double.NaN)); // -1
System.out.println(d.compareTo(Double.NEGATIVE_INFINITY)); // 1
System.out.println(d.compareTo(Double.POSITIVE_INFINITY)); // -1

Optional<Double> describeConstable ()

Returns an Optional containing the nominal descriptor for this instance, which is the instance itself.

Double (Java SE 18 & JDK 18) 
final var ret = Double.valueOf(1.23).describeConstable();
System.out.println(ret); // Optional[1.23]

static long doubleToLongBits (double value)

Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout.

Double (Java SE 18 & JDK 18) 
final var bits1 = Double.doubleToLongBits(1.0);
System.out.println(Long.toHexString(bits1)); // 3ff0000000000000

final var bits2 = Double.doubleToLongBits(-1.0);
System.out.println(Long.toHexString(bits2)); // bff0000000000000

final var bits = Double.doubleToLongBits(123.25);
System.out.println(Long.toHexString(bits)); // 405ed00000000000

final var bits1 = Double.doubleToLongBits(Double.NaN);
System.out.println(Long.toHexString(bits1)); // 7ff8000000000000

final var bits2 = Double.doubleToLongBits(Double.NEGATIVE_INFINITY);
System.out.println(Long.toHexString(bits2)); // fff0000000000000

final var bits3 = Double.doubleToLongBits(Double.POSITIVE_INFINITY);
System.out.println(Long.toHexString(bits3)); // 7ff0000000000000

static long doubleToRawLongBits (double value)

Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, preserving Not-a-Number (NaN) values.

Double (Java SE 18 & JDK 18) 
final var bits1 = Double.doubleToRawLongBits(1.0);
System.out.println(Long.toHexString(bits1)); // 3ff0000000000000

final var bits2 = Double.doubleToRawLongBits(-1.0);
System.out.println(Long.toHexString(bits2)); // bff0000000000000

final var bits = Double.doubleToRawLongBits(123.25);
System.out.println(Long.toHexString(bits)); // 405ed00000000000

final var bits1 = Double.doubleToRawLongBits(Double.NaN);
System.out.println(Long.toHexString(bits1)); // 7ff8000000000000

final var bits2 = Double.doubleToRawLongBits(Double.NEGATIVE_INFINITY);
System.out.println(Long.toHexString(bits2)); // fff0000000000000

final var bits3 = Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
System.out.println(Long.toHexString(bits3)); // 7ff0000000000000

double doubleValue ()

Returns the double value of this Double object.

Double (Java SE 18 & JDK 18) 
final double ret1 = Double.valueOf(1.23).doubleValue();
System.out.println(ret1); // 1.23

final double ret2 = Double.valueOf(-4.56).doubleValue();
System.out.println(ret2); // -4.56

System.out.println(Double.valueOf(Double.NaN).doubleValue()); // NaN
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).doubleValue()); // -Infinity
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).doubleValue()); // Infinity

boolean equals (Object obj)

Compares this object against the specified object.

Double (Java SE 18 & JDK 18) 
final var d1 = Double.valueOf(1.23);
final var d2 = Double.valueOf(1.23);

System.out.println(d1.equals(d2)); // true

final var d1 = Double.valueOf(1.23);
final var d2 = Double.valueOf(4.56);

System.out.println(d1.equals(d2)); // false

// An example with rounding error.
final var d1 = Double.valueOf(0.3);
final var d2 = Double.valueOf(0.1 + 0.2);

System.out.println(d1.equals(d2)); // false

final var d1 = Double.valueOf(Double.NaN);
final var d2 = Double.valueOf(Double.NaN);

System.out.println(d1.doubleValue() == d2.doubleValue()); // false
System.out.println(d1.equals(d2)); // true

final var d1 = Double.valueOf(+0.0);
final var d2 = Double.valueOf(-0.0);

System.out.println(d1.doubleValue() == d2.doubleValue()); // true
System.out.println(d1.equals(d2)); // false

float floatValue ()

Returns the value of this Double as a float after a narrowing primitive conversion.

Double (Java SE 18 & JDK 18) 
final float ret1 = Double.valueOf(1.23).floatValue();
System.out.println(ret1); // 1.23

final float ret2 = Double.valueOf(-4.56).floatValue();
System.out.println(ret2); // -4.56

final var d = Double.valueOf(Double.MAX_VALUE);
System.out.println(d); // 1.7976931348623157E308

final float ret = d.floatValue();
System.out.println(ret); // Infinity

System.out.println(Double.valueOf(Double.NaN).floatValue()); // NaN
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).floatValue()); // -Infinity
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).floatValue()); // Infinity

int hashCode ()

Returns a hash code for this Double object.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.valueOf(1.23).hashCode()); // 1158867386
System.out.println(Double.valueOf(-4.56).hashCode()); // 1673869133

System.out.println(Double.valueOf(Double.MAX_VALUE).hashCode()); // -2146435072
System.out.println(Double.valueOf(Double.MIN_VALUE).hashCode()); // 1

System.out.println(Double.valueOf(Double.NaN).hashCode()); // 2146959360
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).hashCode()); // -1048576
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).hashCode()); // 2146435072

System.out.println(Double.valueOf(+0.0).hashCode()); // 0
System.out.println(Double.valueOf(-0.0).hashCode()); // -2147483648

static int hashCode (double value)

Returns a hash code for a double value; compatible with Double.hashCode().

Double (Java SE 18 & JDK 18) 
System.out.println(Double.hashCode(1.23)); // 1158867386
System.out.println(Double.hashCode(-4.56)); // 1673869133

System.out.println(Double.hashCode(Double.MAX_VALUE)); // -2146435072
System.out.println(Double.hashCode(Double.MIN_VALUE)); // 1

System.out.println(Double.hashCode(Double.NaN)); // 2146959360
System.out.println(Double.hashCode(Double.NEGATIVE_INFINITY)); // -1048576
System.out.println(Double.hashCode(Double.POSITIVE_INFINITY)); // 2146435072

System.out.println(Double.hashCode(+0.0)); // 0
System.out.println(Double.hashCode(-0.0)); // -2147483648

int intValue ()

Returns the value of this Double as an int after a narrowing primitive conversion.

Double (Java SE 18 & JDK 18) 
final int value1 = Double.valueOf(100.0).intValue();
System.out.println(value1); // 100

final int value2 = Double.valueOf(22.222).intValue();
System.out.println(value2); // 22

final int value3 = Double.valueOf(9.99).intValue();
System.out.println(value3); // 9

System.out.println(Integer.MAX_VALUE); // 2147483647
System.out.println(Integer.MIN_VALUE); // -2147483648

final int value1 = Double.valueOf(2147483647.0).intValue();
System.out.println(value1); // 2147483647

final int value2 = Double.valueOf(2147483648.0).intValue();
System.out.println(value2); // 2147483647

final int value3 = Double.valueOf(-2147483648.0).intValue();
System.out.println(value3); // -2147483648

final int value4 = Double.valueOf(-2147483649.0).intValue();
System.out.println(value4); // -2147483648

final int value1 = Double.valueOf(Double.NaN).intValue();
System.out.println(value1); // 0

final int value2 = Double.valueOf(Double.NEGATIVE_INFINITY).intValue();
System.out.println(value2); // -2147483648

final int value3 = Double.valueOf(Double.POSITIVE_INFINITY).intValue();
System.out.println(value3); // 2147483647

static boolean isFinite (double d)

Returns true if the argument is a finite floating-point value; returns false otherwise (for NaN and infinity arguments).

Double (Java SE 18 & JDK 18) 
System.out.println(Double.isFinite(0.0)); // true
System.out.println(Double.isFinite(1.23)); // true
System.out.println(Double.isFinite(-4.56)); // true

System.out.println(Double.isFinite(Double.NaN)); // false
System.out.println(Double.isFinite(Double.NEGATIVE_INFINITY)); // false
System.out.println(Double.isFinite(Double.POSITIVE_INFINITY)); // false

boolean isInfinite ()

Returns true if this Double value is infinitely large in magnitude, false otherwise.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.valueOf(0.0).isInfinite()); // false
System.out.println(Double.valueOf(1.23).isInfinite()); // false
System.out.println(Double.valueOf(-4.56).isInfinite()); // false

System.out.println(Double.valueOf(Double.NaN).isInfinite()); // false
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).isInfinite()); // true
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).isInfinite()); // true

static boolean isInfinite (double v)

Returns true if the specified number is infinitely large in magnitude, false otherwise.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.isInfinite(0.0)); // false
System.out.println(Double.isInfinite(1.23)); // false
System.out.println(Double.isInfinite(-4.56)); // false

System.out.println(Double.isInfinite(Double.NaN)); // false
System.out.println(Double.isInfinite(Double.NEGATIVE_INFINITY)); // true
System.out.println(Double.isInfinite(Double.POSITIVE_INFINITY)); // true

boolean isNaN ()

Returns true if this Double value is a Not-a-Number (NaN), false otherwise.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.valueOf(0.0).isNaN()); // false
System.out.println(Double.valueOf(1.23).isNaN()); // false
System.out.println(Double.valueOf(-4.56).isNaN()); // false

System.out.println(Double.valueOf(Double.NaN).isNaN()); // true
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).isNaN()); // false
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).isNaN()); // false

static boolean isNaN (double v)

Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.isNaN(0.0)); // false
System.out.println(Double.isNaN(1.23)); // false
System.out.println(Double.isNaN(-4.56)); // false

System.out.println(Double.isNaN(Double.NaN)); // true
System.out.println(Double.isNaN(Double.NEGATIVE_INFINITY)); // false
System.out.println(Double.isNaN(Double.POSITIVE_INFINITY)); // false

static double longBitsToDouble (long bits)

Returns the double value corresponding to a given bit representation.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.longBitsToDouble(0x3ff0000000000000L)); // 1.0
System.out.println(Double.longBitsToDouble(0xbff0000000000000L)); // -1.0

System.out.println(Double.longBitsToDouble(0x405ed00000000000L)); // 123.25

System.out.println(Double.longBitsToDouble(0x7ff8000000000000L)); // NaN
System.out.println(Double.longBitsToDouble(0xfff0000000000000L)); // -Infinity
System.out.println(Double.longBitsToDouble(0x7ff0000000000000L)); // Infinity

long longValue ()

Returns the value of this Double as a long after a narrowing primitive conversion.

Double (Java SE 18 & JDK 18) 
final long value1 = Double.valueOf(100.0).longValue();
System.out.println(value1); // 100

final long value2 = Double.valueOf(22.222).longValue();
System.out.println(value2); // 22

final long value3 = Double.valueOf(9.99).longValue();
System.out.println(value3); // 9

System.out.println(Long.MAX_VALUE); // 9223372036854775807
System.out.println(Long.MIN_VALUE); // -9223372036854775808

final long value1 = Double.valueOf(9223372036854775807.0).longValue();
System.out.println(value1); // 9223372036854775807

final long value2 = Double.valueOf(9223372036854775808.0).longValue();
System.out.println(value2); // 9223372036854775807

final long value3 = Double.valueOf(-9223372036854775808.0).longValue();
System.out.println(value3); // -9223372036854775808

final long value4 = Double.valueOf(-9223372036854775809.0).longValue();
System.out.println(value4); // -9223372036854775808

final long value1 = Double.valueOf(Double.NaN).longValue();
System.out.println(value1); // 0

final long value2 = Double.valueOf(Double.NEGATIVE_INFINITY).longValue();
System.out.println(value2); // -9223372036854775808

final long value3 = Double.valueOf(Double.POSITIVE_INFINITY).longValue();
System.out.println(value3); // 9223372036854775807

static double max (double a, double b)

Returns the greater of two double values as if by calling Math.max.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.max(1.23, 4.56)); // 4.56
System.out.println(Double.max(-7.89, 7.89)); // 7.89

System.out.println(Double.max(1.23, Double.NaN)); // NaN
System.out.println(Double.max(1.23, Double.NEGATIVE_INFINITY)); // 1.23
System.out.println(Double.max(1.23, Double.POSITIVE_INFINITY)); // Infinity

System.out.println(Double.max(+0.0, -0.0)); // 0.0

static double min (double a, double b)

Returns the smaller of two double values as if by calling Math.min.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.min(1.23, 4.56)); // 1.23
System.out.println(Double.min(-7.89, 7.89)); // -7.89

System.out.println(Double.min(1.23, Double.NaN)); // NaN
System.out.println(Double.min(1.23, Double.NEGATIVE_INFINITY)); // -Infinity
System.out.println(Double.min(1.23, Double.POSITIVE_INFINITY)); // 1.23

System.out.println(Double.min(+0.0, -0.0)); // -0.0

static double parseDouble (String s)

Returns a new double initialized to the value represented by the specified String, as performed by the valueOf method of class Double.

Double (Java SE 18 & JDK 18) 
final double d1 = Double.parseDouble("1.23");
System.out.println(d1); // 1.23

final double d2 = Double.parseDouble("-4.56");
System.out.println(d2); // -4.56

final double d3 = Double.parseDouble("1.234e+3");
System.out.println(d3); // 1234.0

final double d4 = Double.parseDouble("1.234e-3");
System.out.println(d4); // 0.001234

final double d5 = Double.parseDouble("0xffffp-1");
System.out.println(d5); // 32767.5
System.out.println(Double.toHexString(d5)); // 0x1.fffep14

final double d1 = Double.parseDouble("NaN");
System.out.println(d1); // NaN

final double d2 = Double.parseDouble("-Infinity");
System.out.println(d2); // -Infinity

final double d3 = Double.parseDouble("Infinity");
System.out.println(d3); // Infinity

Double resolveConstantDesc (MethodHandles.Lookup lookup)

Resolves this instance as a ConstantDesc, the result of which is the instance itself.

Double (Java SE 18 & JDK 18) 
final var value = Double.valueOf(1.23);

final var ret = value.resolveConstantDesc(MethodHandles.lookup());
System.out.println(ret); // 1.23

short shortValue ()

Returns the value of this Double as a short after a narrowing primitive conversion.

Double (Java SE 18 & JDK 18) 
final short value1 = Double.valueOf(100.0).shortValue();
System.out.println(value1); // 100

final short value2 = Double.valueOf(22.222).shortValue();
System.out.println(value2); // 22

final short value3 = Double.valueOf(9.99).shortValue();
System.out.println(value3); // 9

System.out.println(Short.MAX_VALUE); // 32767
System.out.println(Short.MIN_VALUE); // -32768

final short value1 = Double.valueOf(32767.0).shortValue();
System.out.println(value1); // 32767

final short value2 = Double.valueOf(32768.0).shortValue();
System.out.println(value2); // -32768

final short value3 = Double.valueOf(-32768.0).shortValue();
System.out.println(value3); // -32768

final short value4 = Double.valueOf(-32769.0).shortValue();
System.out.println(value4); // 32767

final short value1 = Double.valueOf(Double.NaN).shortValue();
System.out.println(value1); // 0

final short value2 = Double.valueOf(Double.NEGATIVE_INFINITY).shortValue();
System.out.println(value2); // 0

final short value3 = Double.valueOf(Double.POSITIVE_INFINITY).shortValue();
System.out.println(value3); // -1

static double sum (double a, double b)

Adds two double values together as per the + operator.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.sum(1.0, 5.0)); // 6.0
System.out.println(Double.sum(1.0, -5.0)); // -4.0

System.out.println(Double.sum(1.234, Double.NaN)); // NaN
System.out.println(Double.sum(1.234, Double.NEGATIVE_INFINITY)); // -Infinity
System.out.println(Double.sum(1.234, Double.POSITIVE_INFINITY)); // Infinity

// An example with rounding error.
System.out.println(Double.sum(0.1, 0.2)); // 0.30000000000000004

static String toHexString (double d)

Returns a hexadecimal string representation of the double argument.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.toHexString(1.0)); // 0x1.0p0
System.out.println(Double.toHexString(-1.0)); // -0x1.0p0
System.out.println(Double.toHexString(2.0)); // 0x1.0p1
System.out.println(Double.toHexString(3.0)); // 0x1.8p1
System.out.println(Double.toHexString(0.5)); // 0x1.0p-1
System.out.println(Double.toHexString(0.25)); // 0x1.0p-2

System.out.println(Double.toHexString(Double.MAX_VALUE)); // 0x1.fffffffffffffp1023
System.out.println(Double.toHexString(Double.MIN_VALUE)); // 0x0.0000000000001p-1022

System.out.println(Double.toHexString(Double.NaN)); // NaN
System.out.println(Double.toHexString(Double.NEGATIVE_INFINITY)); // -Infinity
System.out.println(Double.toHexString(Double.POSITIVE_INFINITY)); // Infinity

String toString ()

Returns a string representation of this Double object.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.valueOf(1.23).toString()); // 1.23
System.out.println(Double.valueOf(-4.56).toString()); // -4.56

System.out.println(Double.valueOf(1234567890.0).toString()); // 1.23456789E9
System.out.println(Double.valueOf(1.23e-10).toString()); // 1.23E-10

System.out.println(Double.valueOf(0.0).toString()); // 0.0
System.out.println(Double.valueOf(-0.0).toString()); // -0.0

System.out.println(Double.valueOf(Double.MAX_VALUE).toString()); // 1.7976931348623157E308
System.out.println(Double.valueOf(Double.MIN_VALUE).toString()); // 4.9E-324

System.out.println(Double.valueOf(Double.NaN).toString()); // NaN
System.out.println(Double.valueOf(Double.NEGATIVE_INFINITY).toString()); // -Infinity
System.out.println(Double.valueOf(Double.POSITIVE_INFINITY).toString()); // Infinity

static String toString (double d)

Returns a string representation of the double argument.

Double (Java SE 18 & JDK 18) 
System.out.println(Double.toString(1.23)); // 1.23
System.out.println(Double.toString(-4.56)); // -4.56

System.out.println(Double.toString(1234567890.0)); // 1.23456789E9
System.out.println(Double.toString(1.23e-10)); // 1.23E-10

System.out.println(Double.toString(0.0)); // 0.0
System.out.println(Double.toString(-0.0)); // -0.0

System.out.println(Double.toString(Double.MAX_VALUE)); // 1.7976931348623157E308
System.out.println(Double.toString(Double.MIN_VALUE)); // 4.9E-324

System.out.println(Double.toString(Double.NaN)); // NaN
System.out.println(Double.toString(Double.NEGATIVE_INFINITY)); // -Infinity
System.out.println(Double.toString(Double.POSITIVE_INFINITY)); // Infinity

static Double valueOf (double d)

Returns a Double instance representing the specified double value.

Double (Java SE 18 & JDK 18) 
final var d1 = Double.valueOf(1.23);
System.out.println(d1); // 1.23

final var d2 = Double.valueOf(-4.56);
System.out.println(d2); // -4.56

final var d3 = Double.valueOf(1234567890.0);
System.out.println(d3); // 1.23456789E9

final var d4 = Double.valueOf(1.23e-10);
System.out.println(d4); // 1.23E-10

final var d5 = Double.valueOf(Double.MAX_VALUE);
System.out.println(d5); // 1.7976931348623157E308

final var d6 = Double.valueOf(Double.MIN_VALUE);
System.out.println(d6); // 4.9E-324

static Double valueOf (String s)

Returns a Double object holding the double value represented by the argument string s.

Double (Java SE 18 & JDK 18) 
final var d1 = Double.valueOf("1.23");
System.out.println(d1); // 1.23

final var d2 = Double.valueOf("-4.56");
System.out.println(d2); // -4.56

final var d3 = Double.valueOf("1.234e+3");
System.out.println(d3); // 1234.0

final var d4 = Double.valueOf("1.234e-3");
System.out.println(d4); // 0.001234

final var d5 = Double.valueOf("0xffffp-1");
System.out.println(d5); // 32767.5
System.out.println(Double.toHexString(d5)); // 0x1.fffep14

final var d1 = Double.valueOf("NaN");
System.out.println(d1); // NaN

final var d2 = Double.valueOf("-Infinity");
System.out.println(d2); // -Infinity

final var d3 = Double.valueOf("Infinity");
System.out.println(d3); // Infinity

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