Java知多少（47）多重catch语句的使用

 1 // Demonstrate multiple catch statements.
 2 class MultiCatch {
 3     public static void main(String args[]) {
 4         try {
 5             int a = args.length;
 6             System.out.println("a = " + a);
 7             int b = 42 / a;
 8             int c[] = { 1 };
 9             c[42] = 99;
10         } catch(ArithmeticException e) {
11             System.out.println("Divide by 0: " + e);
12         } catch(ArrayIndexOutOfBoundsException e) {
13             System.out.println("Array index oob: " + e);
14         }
15         System.out.println("After try/catch blocks.");
16     }
17 }

 1 /* This program contains an error.
 2 A subclass must come before its superclass in a series of catch statements. If not,unreachable code will be created and acompile-time error will result.
 3 */
 4 class SuperSubCatch {
 5     public static void main(String args[]) {
 6         try {
 7             int a = 0;
 8             int b = 42 / a;
 9         } catch(Exception e) {
10             System.out.println("Generic Exception catch.");
11         }
12         /* This catch is never reached because
13         ArithmeticException is a subclass of Exception. */
14         catch(ArithmeticException e) { // ERROR - unreachable
15             System.out.println("This is never reached.");
16         }
17     }
18 }