異常恢復模型

終止與恢復

在Java異常中  有兩種機制

一種是終止模型  一種是恢復模型

用while循環建立 恢復模型  不斷重複 直到不再出現異常

public class Ex5 {
	private static int[] ia = new int[2];
	static int x = 5;	
	public static void main(String[] args) {
		while(true) {
			try {
				ia[x] = 1;
				System.out.println(ia[x]);
				break;	
			} catch(ArrayIndexOutOfBoundsException e) {
				System.err.println(
					"Caught ArrayIndexOutOfBoundsException");
					e.printStackTrace();
				x--;
			} finally {
				System.out.println("Are we done yet?");		
			}
		}
		System.out.println("Now, we're done.");
	}	
}

結果：

Caught ArrayIndexOutOfBoundsException
Are we done yet?
Are we done yet?
java.lang.ArrayIndexOutOfBoundsException: 5
	at my.test.Ex5.main(Ex5.java:9)
Caught ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException: 4
	at my.test.Ex5.main(Ex5.java:9)
Caught ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException: 3
	at my.test.Ex5.main(Ex5.java:9)
Are we done yet?
Caught ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException: 2
	at my.test.Ex5.main(Ex5.java:9)
Are we done yet?
1
Are we done yet?
Now, we're done.