代碼1：

    
package scjp;

public class Demo464 {
	public static void main(String args[]){ 
	    System.out.println("Before Try"); 
	    try {
	    	
	    } catch(NullPointerException t) { 
	    System.out.println("Inside Catch"); 
	  } 
	    System.out.println("At the End"); 
	 } 

}


  

代碼2：

    
package scjp;

import java.io.IOException;

public class Demo464 {
	public static void main(String args[]){ 
	    System.out.println("Before Try"); 
	    try {
	    	
	    } catch(IOException t) { 
	    System.out.println("Inside Catch"); 
	  } 
	    System.out.println("At the End"); 
	 } 

}

  

代碼2中在catch行會(huì)報(bào)錯(cuò)，說(shuō)永遠(yuǎn)不會(huì)有IOException可以catch，為什么代碼1卻不會(huì)報(bào)錯(cuò)呢。

try catch 空塊的情況