Java数组删除指定元素_JAVA_编程开发_程序员俱乐部

class="java">
package com.zas.util;

import java.util.Arrays;

public class ArrayUtil {
    
	/**
	 * 删除数组的第 i 个元素(从0开始)
	 * @param arr
	 * @param pos
	 * @return 成功  true 失败 false
	 */
	public static Boolean arrayDeleteByPos(Object[] arr, int pos) {
		if(arr == null || pos < 0 || (pos + 1) > arr.length){
			return false;
		}
		for (int j = pos; j < arr.length - 1; j++) {
			 arr[j]= arr[j + 1];  
		}
		arr[arr.length - 1] = null;
		return true;
	}
	
	/**
	 * 删除数组元素 obj (相同元素只删除一个)
	 * @param arr
	 * @param i
	 * @return 成功  true 失败 false
	 */
	public static Boolean arrayDeleteByObj(Object[] arr, Object obj) {
		if(arr == null){
			return false;
		}
		int pos = -1;
		for (int j = 0; j < arr.length; j++) {
			if(obj == null){
				if(arr[j] == null){
					pos = j;
				}
			}else{
				if(obj.equals(arr[j])){
					pos = j;
				}
			}
		}
		if(pos == -1){
			return false;
		}
		return arrayDeleteByPos(arr, pos);
	}
	
	public static void main(String[] args) {
		Object[] mks = {1, "2", 3, "4", 5, 6};
		System.out.println(Arrays.toString(mks));
		arrayDeleteByObj(mks, 4);
		System.out.println(Arrays.toString(mks));
		arrayDeleteByObj(mks, "4");
		System.out.println(Arrays.toString(mks));
		arrayDeleteByPos(mks, 2);
		System.out.println(Arrays.toString(mks));
	}
}