JAVA如何实现数组的元素删除？

import java.util.Arrays;
 
public class ArrayTest1 {
 
	public static void main(String[] args) {
		int[] array1 = new int[] {4, 5, 6, 7};
		int num = 2;
		int[] newArray = new int[array1.length-1];
		
		for(int i=0;i<newArray.length; i++) {
			// 判断元素是否越界
			if (num < 0 || num >= array1.length) {
				throw new RuntimeException("元素越界... "); 
			} 
			// 
			if(i<num) {
				newArray[i] = array1[i];
			}
			else {
				newArray[i] = array1[i+1];
			}
		}
		// 打印输出数组内容
		System.out.println(Arrays.toString(array1));
		array1 = newArray;
		System.out.println(Arrays.toString(array1));
	}
}