Java基础之异常的抛出过程

电玩女神 2023-03-01 09:21 175阅读 0赞

/*
    
    */
    class Demo
    {
        
    	public int method(int[] arr,int index)
    	{
        		
    
    		if(arr==null)
    			throw new NullPointerException("数组的引用不能为空！");
    
    		if(index>=arr.length)
    		{
        
    			throw new ArrayIndexOutOfBoundsException("数组的角标越界啦，哥们，你是不是疯了？："+index);
    		}
    		if(index<0)
    		{
        
    			throw new ArrayIndexOutOfBoundsException("数组的角标不能为负数，哥们，你是真疯了！："+index);
    		}
    		return arr[index];
    	}
    }
    
    class  ExceptionDemo2
    {
        
    	public static void main(String[] args) 
    	{
        
    		int[] arr = new int[3];
    		
    		Demo d = new Demo();
    		int num = d.method(null,-30);
    		System.out.println("num="+num);
    		System.out.println("over");
    	}
    	
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70_pic_center_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70]: /images/20230209/61043cd606fc4860a1e4f2f83588cffc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70_pic_center_pic_center]: https://img-blog.csdnimg.cn/20201102112836336.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ==,size_16,color_FFFFFF,t_70#pic_center#pic_center