黑马程序员——自定义异常类

                                                      

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package Exception;

public class ZiDingYi_Exception{
 public static void main(String args[]){
  Demo d=new Demo();
  try{
   System.out.println(d.test(3,-1));
  }catch(FuShuException f){//具体异常
   System.out.println(f.toString());
   System.out.println(f.getNum());//获取导致异常出现的负数
   System.out.println("出现负数了，你疯了？");
  }catch(Exception e){//异常的父类要写到所有具体异常的下面
   e.printStackTrace();
  }
  
 }
}
class Demo{
 public int test(int a,int b) throws FuShuException{
  if(b<0){//判断
   throw new FuShuException("你的除数是负数",b);//抛出异常类
  }
  return a/b;
 }
}
/**
 * 自定义异常类，继承Exception类
 * @author wjw
 *
 */
class FuShuException extends Exception{
 public FuShuException(){
 }
 private int num;
 public FuShuException(String msg,int num){
  super(msg);//Exception类中已经有这个方法，直接super即可
  this.num=num;
 }
 public int getNum(){
  return num;
 }
}

 

 

                                                 

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