StringReader (Java SE 21 & JDK 21) en Java con ejemplos.
Encontrará ejemplos de código en la mayoría de los métodos de StringReader.
Nota :
- Este artículo puede utilizar software de traducción para su comodidad. Consulte también la versión original en inglés.
Summary
Un flujo de caracteres cuya fuente es una cadena. (Traducción automática)
try (final var reader = new StringReader("abc")) {
final var ret1 = reader.read();
System.out.printf("%d : %c%n", ret1, ret1); // 97 : a
final var ret2 = reader.read();
System.out.printf("%d : %c%n", ret2, ret2); // 98 : b
final var ret3 = reader.read();
System.out.printf("%d : %c%n", ret3, ret3); // 99 : c
final var ret4 = reader.read();
System.out.println(ret4); // -1
}
final var s = """
abcd
XYZ
12345
""";
try (final var reader = new BufferedReader(new StringReader(s))) {
System.out.println(reader.readLine()); // abcd
System.out.println(reader.readLine()); // XYZ
System.out.println(reader.readLine()); // 12345
System.out.println(reader.readLine()); // null
}
Fields declared in Reader
Constructors
StringReader (String s)
Crea un nuevo lector de cadenas. (Traducción automática)
try (final var reader = new StringReader("abcd")) {
final var cbuf = new char[4];
System.out.println(reader.read(cbuf)); // 4
System.out.println(Arrays.toString(cbuf)); // [a, b, c, d]
}
Methods
void close ()
Cierra la transmisión y libera todos los recursos del sistema asociados con ella. (Traducción automática)
try (final var reader = new StringReader("abcd")) {
final var cbuf = new char[4];
System.out.println(reader.read(cbuf)); // 4
System.out.println(Arrays.toString(cbuf)); // [a, b, c, d]
}
// An example without a try-with-resources statement.
final var reader = new StringReader("abcd");
try {
final var cbuf = new char[4];
System.out.println(reader.read(cbuf)); // 4
System.out.println(Arrays.toString(cbuf)); // [a, b, c, d]
} finally {
reader.close();
}
void mark (int readAheadLimit)
Marca la posición actual en la secuencia. (Traducción automática)
try (final var reader = new StringReader("abcde")) {
System.out.printf("%c%n", reader.read()); // a
System.out.printf("%c%n", reader.read()); // b
System.out.printf("%c%n", reader.read()); // c
// A readAheadLimit is ignored.
reader.mark(0);
System.out.printf("%c%n", reader.read()); // d
System.out.printf("%c%n", reader.read()); // e
System.out.println(reader.read()); // -1
reader.reset();
System.out.printf("%c%n", reader.read()); // d
System.out.printf("%c%n", reader.read()); // e
System.out.println(reader.read()); // -1
}
boolean markSupported ()
Indica si esta secuencia admite la operación mark(), lo cual hace. (Traducción automática)
try (final var reader = new StringReader("abcd")) {
System.out.println(reader.markSupported()); // true
}
int read ()
Lee un solo caracter. (Traducción automática)
try (final var reader = new StringReader("abc")) {
final var ret1 = reader.read();
System.out.printf("%d : %c%n", ret1, ret1); // 97 : a
final var ret2 = reader.read();
System.out.printf("%d : %c%n", ret2, ret2); // 98 : b
final var ret3 = reader.read();
System.out.printf("%d : %c%n", ret3, ret3); // 99 : c
final var ret4 = reader.read();
System.out.println(ret4); // -1
}
int read (char[] cbuf, int off, int len)
Lee caracteres en una parte de una matriz. (Traducción automática)
try (final var reader = new StringReader("abcdefg")) {
final var cbuf = new char[5];
System.out.println(reader.read(cbuf, 0, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [a, , , , ]
System.out.println(reader.read(cbuf, 0, 2)); // 2
System.out.println(Arrays.toString(cbuf)); // [b, c, , , ]
System.out.println(reader.read(cbuf, 0, 3)); // 3
System.out.println(Arrays.toString(cbuf)); // [d, e, f, , ]
System.out.println(reader.read(cbuf, 0, 4)); // 1
System.out.println(Arrays.toString(cbuf)); // [g, e, f, , ]
System.out.println(reader.read(cbuf, 0, 5)); // -1
System.out.println(Arrays.toString(cbuf)); // [g, e, f, , ]
}
try (final var reader = new StringReader("abcde")) {
final var cbuf = new char[5];
System.out.println(reader.read(cbuf, 4, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [ , , , , a]
System.out.println(reader.read(cbuf, 3, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [ , , , b, a]
System.out.println(reader.read(cbuf, 2, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [ , , c, b, a]
System.out.println(reader.read(cbuf, 1, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [ , d, c, b, a]
System.out.println(reader.read(cbuf, 0, 1)); // 1
System.out.println(Arrays.toString(cbuf)); // [e, d, c, b, a]
}
try (final var reader = new StringReader("abcdefg")) {
final var cbuf = new char[3];
System.out.println(reader.read(cbuf, 0, 3)); // 3
System.out.println(Arrays.toString(cbuf)); // [a, b, c]
//reader.read(cbuf, 0, 4); // IndexOutOfBoundsException
//reader.read(cbuf, 3, 1); // IndexOutOfBoundsException
}
boolean ready ()
Indica si esta secuencia está lista para ser leída. (Traducción automática)
try (final var reader = new StringReader("abc")) {
System.out.println(reader.ready()); // true
System.out.printf("%c%n", reader.read()); // a
System.out.println(reader.ready()); // true
System.out.printf("%c%n", reader.read()); // b
System.out.println(reader.ready()); // true
System.out.printf("%c%n", reader.read()); // c
System.out.println(reader.ready()); // true
System.out.println(reader.read()); // -1
}
void reset ()
Restablece la secuencia a la marca más reciente o al comienzo de la cadena si nunca se ha marcado. (Traducción automática)
try (final var reader = new StringReader("abcde")) {
System.out.printf("%c%n", reader.read()); // a
System.out.printf("%c%n", reader.read()); // b
System.out.printf("%c%n", reader.read()); // c
// A readAheadLimit is ignored.
reader.mark(0);
System.out.printf("%c%n", reader.read()); // d
System.out.printf("%c%n", reader.read()); // e
System.out.println(reader.read()); // -1
reader.reset();
System.out.printf("%c%n", reader.read()); // d
System.out.printf("%c%n", reader.read()); // e
System.out.println(reader.read()); // -1
}
long skip (long n)
Salta caracteres. (Traducción automática)
try (final var reader = new StringReader("abcdefghij")) {
System.out.printf("%c%n", reader.read()); // a
System.out.println(reader.skip(1)); // 1
System.out.printf("%c%n", reader.read()); // c
System.out.println(reader.skip(2)); // 2
System.out.printf("%c%n", reader.read()); // f
System.out.println(reader.skip(3)); // 3
System.out.printf("%c%n", reader.read()); // j
System.out.println(reader.skip(1)); // 0
System.out.println(reader.read()); // -1
}
try (final Reader reader = new StringReader("abcde")) {
System.out.printf("%c%n", reader.read()); // a
System.out.println(reader.skip(10)); // 4
System.out.println(reader.read()); // -1
}
Methods declared in Reader
Related posts
- Ejemplos de API