Java基础之异常的抛出过程

电玩女神 2023-03-01 09:21 186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");
    	}
    	
    }

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