Java : IOException with Examples

IOException (Java SE 21 & JDK 21) with Examples.
You will find code examples on most IOException methods.

Summary

Signals that an I/O exception of some sort has occurred. This class is the general class of exceptions produced by failed or interrupted I/O operations.

Class diagram

final var path = Path.of("R:", "java-work", "aaa.txt");
System.out.println(path); // R:\java-work\aaa.txt

System.out.println(Files.notExists(path)); // true

try {
    final var str = Files.readString(path);
} catch (IOException e) {
    System.out.println(e);
}

// Result
// ↓
//java.nio.file.NoSuchFileException: R:\java-work\aaa.txt

Constructors

IOException ()

Constructs an IOException with null as its error detail message.

final var e = new IOException();
System.out.println(e); // java.io.IOException

IOException (String message)

Constructs an IOException with the specified detail message.

final var e = new IOException("abcd");
System.out.println(e); // java.io.IOException: abcd
System.out.println(e.getMessage()); // abcd

IOException (String message, Throwable cause)

Constructs an IOException with the specified detail message and cause.

final var cause = new IOException("XYZ");
final var e = new IOException("abcd", cause);

System.out.println(e); // java.io.IOException: abcd
System.out.println(e.getMessage()); // abcd

System.out.println(e.getCause()); // java.io.IOException: XYZ
System.out.println(e.getCause().getMessage()); // XYZ

IOException (Throwable cause)

Constructs an IOException with the specified cause and a detail message of (cause==null ? null : cause.toString()) (which typically contains the class and detail message of cause).

final var cause = new IOException("XYZ");
final var e = new IOException(cause);

System.out.println(e); // java.io.IOException: java.io.IOException: XYZ

System.out.println(e.getCause()); // java.io.IOException: XYZ
System.out.println(e.getCause().getMessage()); // XYZ

Methods declared in Throwable

addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Please see the link below.

Throwable with Examples

API Examples

Java : IOException with Examples

Summary

Constructors

IOException ()

IOException (String message)

IOException (String message, Throwable cause)

IOException (Throwable cause)

Methods declared in Throwable

addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

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