异常处理举例1

1、例1：public class Try1 public static void main (String args) int i=0; int a = 5,6,7,8; for(i=0;i<5;i+) System.out.println(" a"+i+"="+ai); System.out.print("3/0="+(3/0); 例2：public class Try2 public static void main (String args) int i=0; int a = 5,6,7,8; for(i=0;i<5;

2、i+) try System.out.print("a"+i+"/"+i+"="+(ai/i); catch(ArrayIndexOutOfBoundsException e) System.out.print("捕获数组下标越界异常!"); catch(ArithmeticException e) System.out.print("捕获算术异常!"); catch(Exception e) System.out.print("捕获"+e.getMessage()+&quo

3、t;异常!"); /显示异常信息 finally System.out.println(" finally i="+i); System.out.println("继续!"); 练习：分析程序运行结果。运行验证public class catchlx static void setN(int n) System.out.println("n的值是："+n) ; try if (n=0) System.out.println("没有捕获异常!") ; return ; else if (n=1) int i

4、=0;int j=4/i; else if (n=2) int a=new int4;a4=10; catch(ArithmeticException e) System.out.println("捕获的异常信息是："+e) ; catch(ArrayIndexOutOfBoundsException e) System.out.println("捕获的异常信息是："+e) ; catch(Exception e) System.out.println("本句没有执行！") ; finally System.out.println(&

5、quot;finally 块！") ; public static void main(String args) setN(0); setN(1); setN(2); 3.调用方法处理异常（即发生异常的方法中不对异常处理，而是由调用者来处理异常） public calss ExceptionSamplepublic static void main(String args) int z; try z=Division(10,0); catch(Exception e) z=10; System.out.println(z);static int Division(int x, int

6、 y) throws ArithmeticException return x/y; 做如下修改，结果会怎样？public calss ExceptionSamplepublic static void main(String args) throws ArithmeticException int z; z=Division(10,0); System.out.println(z);static int Division(int x, int y) throws ArithmeticException return x/y; 例：用throw抛出异常。class throwSample pu

7、blic static void main(String args)try if (args.length!=1) throw new Exception(“参数过少或过多”); else System.out.println(agrs0);catch(Exception e) System.out.println(“*参数个数不对！”); System.out.println(e.getMessage(); 例：自定义异常public calss MyException extends Throwable public MyException() Super(); public MyExce

8、ption(String msg) Super(msg); public MyException(String msg, Thrwoable cause) Super(msg,cause); public MyException(Thrwoable cause) Super(cause); public class Exceptonsabple public static void main(String args)try throw new MyException(“自定义异常！”); Catch (MyException me) System.out.println(me.getMessa

9、ge(); 自定义异常练习：例如：class MyException extends Exception /自定义异常 private int detail; MyException(int a) detail=a; public String toString() return "myexceptoin = "+detail; public class yichang static void compute(int a) throws MyException /有异常抛出的方法 System.out.println("调用 compute("+a+")") ; if (a>10) throw new MyException(a); System.out.println(" 正常退出 ") ; public static void