增删改查

import java.util.Arrays;
import java.util.Scanner;


public class MethodDemo7_2 {

    //扫描仪
    static Scanner scanner = new Scanner(System.in);
    //一组姓名
    static String[] names = new String[3];

    /**
     * 数据初始化
     */
    public static void init() {
        System.out.println("init-->" + names);
        names[0] = "tom";
        names[1] = "cat";
        names[2] = "lucy";
    }

    /**
     * 显示
     */
    public static void show() {
        System.out.println("show-->" + names);
        for (int i = 0; i < names.length; i++) {
            System.out.println((i + 1) + "-->" + names[i]);
        }
    }

    /**
     * 添加
     */
    public static void add() {
        System.out.println("请输入添加的姓名：");
        String inputName = scanner.next();

        //先扩容
        names = Arrays.copyOf(names, names.length + 1);
        //将输入的姓名存入到数组中
        names[names.length - 1] = inputName;
    }

    /**
     * 删除
     */
    public static void delete() {
        System.out.println("请输入你要删除的姓名：");
        String inputName = scanner.next();
        //根据姓名查找对应的索引
        int index = -1;
        for (int i = 0; i < names.length; i++) {
            if (inputName.equals(names[i])) {
                index = i;
            }
        }
        if (index == -1) {
            System.out.println("[删除失败，该姓名不存在！]");
            return;
        }
        //循环覆盖
        for (int i = index; i < names.length - 1; i++) {
            names[i] = names[i + 1];
        }
        //缩容
        names = Arrays.copyOf(names, names.length - 1);
    }

    /**
     * 入口
     *
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("main-->" + names);
        init();
        add();
        show();
        delete();
        show();
    }
}