zoukankan      html  css  js  c++  java
  • 2020.10.31

    1.

    package first;
    import javax.swing.*;
    class AboutException{
       public static void main(String[] a) 
       {
          int i=1, j=0, k;
          //k=i/j;
    
    
        try
        {
            
            k = i/j;    // Causes division-by-zero exception
            //throw new Exception("Hello.Exception!");
        }
        
        catch ( ArithmeticException e)
        {
            System.out.println("被0除.  "+ e.getMessage());
        }
        
        catch (Exception e)
        {
            if (e instanceof ArithmeticException)
                System.out.println("被0除");
            else
            {  
                System.out.println(e.getMessage());
                
            }
        }
    
        
        finally
             {
                 JOptionPane.showConfirmDialog(null,"OK");
             }
            
      }
    }

     总结:

    (1)把可能会发生错误的代码放进try语句块中。

    (2)当程序检测到出现了一个错误时会抛出一个异常对象。异常处理代码会捕获并处理这个错误。 catch语句块中的代码用于处理错误。

    (3)当异常发生时,程序控制流程由try语句块跳转到catch语句块。

    (4)不管是否有异常发生,finally语句块中的语句始终保证被执行。

    (5)如果没有提供合适的异常处理代码,JVM将会结束掉整个应用程序。

    2.

     1 public class CatchWho { 
     2     public static void main(String[] args) { 
     3         try { 
     4                 try { 
     5                     throw new ArrayIndexOutOfBoundsException(); 
     6                 } 
     7                 catch(ArrayIndexOutOfBoundsException e) { 
     8                        System.out.println(  "ArrayIndexOutOfBoundsException" +  "/内层try-catch"); 
     9                 }
    10  
    11             throw new ArithmeticException(); 
    12         } 
    13         catch(ArithmeticException e) { 
    14             System.out.println("发生ArithmeticException"); 
    15         } 
    16         catch(ArrayIndexOutOfBoundsException e) { 
    17            System.out.println(  "ArrayIndexOutOfBoundsException" + "/外层try-catch"); 
    18         } 
    19     } 
    20 }

     3.

     1 public class CatchWho2 { 
     2     public static void main(String[] args) { 
     3         try {
     4                 try { 
     5                     throw new ArrayIndexOutOfBoundsException(); 
     6                 } 
     7                 catch(ArithmeticException e) { //不同
     8                     System.out.println( "ArrayIndexOutOfBoundsException" + "/内层try-catch"); 
     9                 }
    10             throw new ArithmeticException(); //没有运行
    11         } 
    12         catch(ArithmeticException e) { 
    13             System.out.println("发生ArithmeticException"); 
    14         } 
    15         catch(ArrayIndexOutOfBoundsException e) { 
    16             System.out.println( "ArrayIndexOutOfBoundsException" + "/外层try-catch"); 
    17         } 
    18     } 
    19 }

     4.

     1 public class EmbededFinally {
     2 
     3     
     4     public static void main(String args[]) {
     5         
     6         int result;
     7         
     8         try {
     9             
    10             System.out.println("in Level 1");
    11 
    12            
    13              try {
    14                 
    15                 System.out.println("in Level 2");
    16   // result=100/0;  //Level 2
    17                
    18                  try {
    19                    
    20                      System.out.println("in Level 3");
    21                       
    22                      result=100/0;  //Level 3
    23                 
    24                 } 
    25                 
    26                 catch (Exception e) {
    27                     
    28                     System.out.println("Level 3:" + e.getClass().toString());
    29                 
    30                 }
    31                 
    32                 
    33                 finally {
    34                     
    35                     System.out.println("In Level 3 finally");
    36                 
    37                 }
    38                 
    39                
    40                 // result=100/0;  //Level 2
    41 
    42             
    43                 }
    44             
    45             catch (Exception e) {
    46                
    47                  System.out.println("Level 2:" + e.getClass().toString());
    48            
    49              }
    50              finally {
    51                 
    52                 System.out.println("In Level 2 finally");
    53            
    54              }
    55              
    56             // result = 100 / 0;  //level 1
    57         
    58         } 
    59         
    60         catch (Exception e) {
    61             
    62             System.out.println("Level 1:" + e.getClass().toString());
    63         
    64         }
    65         
    66         finally {
    67            
    68              System.out.println("In Level 1 finally");
    69         
    70         }
    71     
    72     }
    73 
    74 }

    5.

     1 public class SystemExitAndFinally {
     2 
     3     
     4     public static void main(String[] args){
     5         
     6         try{
     7             System.out.println("in main");
     8             throw new Exception("Exception is thrown in main");
     9                     //System.exit(0);
    10         }catch(Exception e)
    11 
    12             {
    13             
    14             System.out.println(e.getMessage());
    15             
    16             System.exit(0);
    17         
    18         }
    19         
    20         finally
    21         
    22         {
    23             
    24             System.out.println("in finally");
    25         
    26         }
    27     
    28     }
    29 
    30 
    31 }

  • 相关阅读:
    python+Appium自动化:记录遇到的坑
    python+Appium自动化:Appium元素检测
    python+Appium自动化:id元素定位
    python+Appium自动化:运行第一个appium脚本
    python+Appium自动化:Capability配置简介
    python+Appium自动化:Appium-desktop界面简介
    Appium简介以及环境安装
    monkeyrunner录制和回放功能
    monkeyrunner脚本录制和回放下载
    MonkeyRunner的简介与综合实践
  • 原文地址:https://www.cnblogs.com/Nojava/p/13905987.html
Copyright © 2011-2022 走看看