Java解决异常之try、catch、finally、throw、throws&log4j记录日志步骤

 1 package day20190311;
 2 /**
 3  * 多重catch语句
 4  * @author Administrator
 5  *
 6  */
 7 public class ExceptionDemo02 {
 8 
 9     public static void main(String[] args) {
10         try{
11             System.out.println("try代码块执行！");
12             int i=4/0;
13             String name=null;
14             System.out.println(name.length());
15         }catch(ArithmeticException e){
16             System.out.println("处理算数异常！");
17             //e.toString()获取的信息包括异常类型和异常详细消息
18             System.out.println(e.toString());
19             //e.getMessage()只是获取了异常的详细消息字符串
20             System.out.println(e.getMessage());
21             //打印异常堆栈信息
22             e.printStackTrace();
23         }catch(NullPointerException e){
24             System.out.println("处理空指针异常！");
25         }
26         //处理多个异常，先子类后父类
27         catch(Exception e){
28             System.out.println("父类处理异常！");
29         }finally{
30             System.out.println("finally代码块执行！");
31         }
32     }
33 }