数组角标越界的异常：ArrayIndexOutOfBoundsExcetion

int[] arr = new int[]{1,2,3,4,5};

for(int i = 0;i <= arr.length;i++){
System.out.println(arr[i]);
}

System.out.println(arr[-2]);

System.out.println(“hello”);

• 情况一：

int[] arr1 = new int[]{1,2,3};
arr1 = null;
System.out.println(arr1[0]);

• 情况二：

int[][] arr2 = new int[4][];
System.out.println(arr2[0][0]);

• 情况三：

String[] arr3 = new String[]{“AA”,”BB”,”CC”};
arr3[0] = null;
System.out.println(arr3[0].toString());