Java Empty Array Check: 3 Easy Methods

In Java, we can use the following method to check if an array is empty:

1. Determine by checking the length property of an array.

int[] arr = new int[0];
if(arr.length == 0){
    System.out.println("数组为空");
} else {
    System.out.println("数组不为空");
}

1. Determine equality using the equals() method of the Arrays class.

int[] arr = new int[0];
if(Arrays.equals(arr, new int[0])){
    System.out.println("数组为空");
} else {
    System.out.println("数组不为空");
}

1. Determine using the toString() method of the Arrays class:

int[] arr = new int[0];
if(Arrays.toString(arr).equals("[]")){
    System.out.println("数组为空");
} else {
    System.out.println("数组不为空");
}

The above are several commonly used methods to determine if an array is empty; choose the appropriate method based on the actual situation.