8.6数组使用中俩个常见的问题

 int[] arr1 = new int[3];
        arr1[0] =1;
        arr1[1] =2;
        arr1[2] =3;
        System.out.println(arr1[0]);
        System.out.println(arr1[1]);
        System.out.println(arr1[2]);
        System.out.println(arr1[3]);  //数组索引越界异常  ArrayIndexOutOfBoundsException

2.空指针异常

数组引用存储的值为null而非数组的地址值时

 //需求演示空指针异常
        int[] arr =new int[3];
        arr[0] =11;
        arr[1] =22;
        arr[2] =33;

        arr = null;
        System.out.println(arr[0]);  //NullPointerException
    }
}

8.6数组使用中俩个常见的问题

原文：https://blog.51cto.com/15138685/2666444