Java 中的 Exception (Java SE 22 & JDK 22) 及其示例。
您将找到大多数 Exception 方法的代码示例。
注解 :
- 本文可能使用了翻译软件以方便阅读。 另请查看英文原文。
简介
Exception 类及其子类是 Throwable 的一种形式，用于指示合理的应用程序可能想要捕获的条件。 (机器翻译)
Code examples on this page uses the SampleException class below.
@SuppressWarnings("serial")
public class SampleException extends Exception {
public SampleException() {
}
public SampleException(String message) {
super(message);
}
public SampleException(String message, Throwable cause) {
super(message, cause);
}
public SampleException(Throwable cause) {
super(cause);
}
public SampleException(String message, Throwable cause,
boolean enableSuppression,
boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}
public class Main {
public static void main(String[] args) {
try {
func1();
} catch (SampleException ex) {
final Exception e = ex;
e.printStackTrace();
// Result
// ↓
//SampleException
// at Main.func2 ...
// at Main.func1 ...
// at Main.main ...
// ...
}
}
private static void func1() throws SampleException {
func2();
}
private static void func2() throws SampleException {
throw new SampleException();
}
}
Constructors
Exception ()
构造一个新的异常，其详细消息为 null。 (机器翻译)
final Exception e = new SampleException();
System.out.println(e); // SampleException
Exception (String message)
构造具有指定详细消息的新异常。 (机器翻译)
final Exception e = new SampleException("abcde");
System.out.println(e); // SampleException: abcde
System.out.println(e.getMessage()); // abcde
Exception (String message, Throwable cause)
构造具有指定详细消息和原因的新异常。 (机器翻译)
final Exception cause = new SampleException("XYZ");
final Exception e = new SampleException("abcde", cause);
System.out.println(e); // SampleException: abcde
System.out.println(e.getMessage()); // abcde
System.out.println(e.getCause()); // SampleException: XYZ
System.out.println(e.getCause().getMessage()); // XYZ
Exception (String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace)
构造一个新的异常，并指定详细消息、原因、启用或禁用抑制以及启用或禁用可写堆栈跟踪。 (机器翻译)
final Exception cause = new SampleException("XYZ");
final Exception e = new SampleException("abcde", cause, true, true);
System.out.println(e); // SampleException: abcde
System.out.println(e.getCause()); // SampleException: XYZ
e.addSuppressed(new SampleException("E1"));
e.addSuppressed(new SampleException("E2"));
// [SampleException: E1, SampleException: E2]
System.out.println(Arrays.toString(e.getSuppressed()));
System.out.println(e.getStackTrace().length > 0); // true
// enableSuppression = false
final Exception cause = new SampleException("XYZ");
final Exception e = new SampleException("abcde", cause, false, true);
System.out.println(e); // SampleException: abcde
System.out.println(e.getCause()); // SampleException: XYZ
e.addSuppressed(new SampleException("E1"));
e.addSuppressed(new SampleException("E2"));
System.out.println(Arrays.toString(e.getSuppressed())); // []
System.out.println(e.getStackTrace().length > 0); // true
// writableStackTrace = false
final Exception cause = new SampleException("XYZ");
final Exception e = new SampleException("abcde", cause, true, false);
System.out.println(e); // SampleException: abcde
System.out.println(e.getCause()); // SampleException: XYZ
e.addSuppressed(new SampleException("E1"));
e.addSuppressed(new SampleException("E2"));
// [SampleException: E1, SampleException: E2]
System.out.println(Arrays.toString(e.getSuppressed()));
System.out.println(e.getStackTrace().length); // 0
Exception (Throwable cause)
构造一个具有指定原因和详细消息（cause==null ? null : cause.toString()）的新异常（通常包含原因的类和详细消息）。 (机器翻译)
final Exception cause = new SampleException("XYZ");
final Exception e = new SampleException(cause);
System.out.println(e); // SampleException: SampleException: XYZ
System.out.println(e.getMessage()); // SampleException: XYZ
System.out.println(e.getCause()); // SampleException: 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
请参阅下面的链接。