来场刺激的数组训练吧！

题目见下图

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

public class Main {
	public static void main(String[] args) {
		//初始化用户名
		String[] nameArray = {"张三","李四","王五","小明"};
		//初始化用户年龄
		int[] ageArray = {22,23,20,22};
		//初始化用户状态
		String[] stateArray = {"正常","正常","正常","正常"};
		Scanner scanner = new Scanner(System.in);
		int num;
		String name;
		int age;
		int index = 0;
		boolean flag;
		do {
			System.out.println("欢迎使用用户管理系统");
			System.out.println("1.查询用户");
			System.out.println("2.添加用户");
			System.out.println("3.删除用户");
			System.out.println("4.账号冻结");
			System.out.println("5.账号解封");
			System.out.println("6.退出系统");
			System.out.print("请选择：");
			num = scanner.nextInt();
			switch(num) {
			case 1:
				System.out.println("------ 查询用户 ------");
				System.out.println("编号\t\t姓名\t\t年龄\t\t状态\t\t");
				for(int i=0;i<nameArray.length;i++) {
					System.out.println((i+1)+"\t\t"+nameArray[i]+"\t\t"+ageArray[1]+"\t\t"+stateArray[i]);
				}
				System.out.print("输入0返回：");
				num = scanner.nextInt();
				break;
			case 2:
				System.out.println("------ 添加用户 ------");
				System.out.print("请输入用户姓名：");
				name = scanner.next();
				flag = isNameExist(name, nameArray);
				if(flag == true) {
					System.out.println(name+"已存在！");
				}else {
					System.out.print("请输入用户年龄：");
					age = scanner.nextInt();
					nameArray = Arrays.copyOf(nameArray, nameArray.length+1);
					nameArray[nameArray.length-1] = name;
					ageArray = Arrays.copyOf(ageArray, ageArray.length+1);
					ageArray[ageArray.length-1] = age;
					stateArray = Arrays.copyOf(stateArray, stateArray.length+1);
					stateArray[stateArray.length-1] = "正常";
					System.out.println("添加成功！");
				}
				System.out.print("输入0返回：");
				num = scanner.nextInt();
				break;
			case 3:
				System.out.println("------ 删除用户 ------");
				System.out.print("请输入要删除的用户名：");
				name = scanner.next();
				flag = isNameExist(name, nameArray);
				if(flag != true) {
					System.out.println(name+"不存在，请重新输入！");
				}else {
					index = getIndex(name, nameArray);
					String[] newNameArray = new String[nameArray.length-1];
					int[] newAgeArray = new int[ageArray.length-1];
					String[] newStateArray = new String[stateArray.length-1];
					for(int i=0;i<index;i++) {
						newNameArray[i] = nameArray[i];
						newAgeArray[i] = ageArray[i];
						newStateArray[i] = stateArray[i];
					}
					for(int i=index;i<newNameArray.length;i++) {
						newNameArray[i] = nameArray[i+1];
						newAgeArray[i] = ageArray[i+1];
						newStateArray[i] = stateArray[i+1];
					}
					nameArray = newNameArray;
					ageArray = newAgeArray;
					stateArray = newStateArray;
					System.out.println(name+"删除成功！");
				}
				System.out.print("输入0返回：");
				num = scanner.nextInt();
				break;
			case 4:
				System.out.println("------ 账号冻结 ------");
				System.out.print("请输入要冻结的用户名：");
				name = scanner.next();
				flag = isNameExist(name, nameArray);
				if(!flag) {
					System.out.println(name+"不存在，请重新输入！");
				}else {
					index = getIndex(name, nameArray);
					if(stateArray[index].equals("冻结")) {
						System.out.println(name+"已冻结！");
					}else {
						stateArray[index] = "冻结";
						System.out.println(name+"冻结成功！");
					}
				}
				System.out.print("输入0返回：");
				num = scanner.nextInt();
				break;
			case 5:
				System.out.println("------ 账号解封 ------");
				System.out.print("请输入要解封的用户名：");
				name = scanner.next();
				//判断name是否存在
				flag = isNameExist(name, nameArray);
				if(!flag) {
					System.out.println(name+"不存在，请重新输入！");
				}else {
					index = getIndex(name, nameArray);
					if(stateArray[index].equals("正常")) {
						System.out.println(name+"状态正常！");
					}else {
						stateArray[index] = "正常";
						System.out.println(name+"解封成功！");
					}
				}
				System.out.print("输入0返回：");
				num = scanner.nextInt();
				break;
			case 6:
				System.out.println("感谢使用用户管理系统！");
				break;
			}
		}while(num == 0);
	}
	
	//检测用户输入的名称是否存在
	public static boolean isNameExist(String name,String[] nameArray) {
		boolean flag = false;
		for(int i = 0; i < nameArray.length;i++) {
			if(name.equals(nameArray[i])) {
				flag = true;
				break;
			}
		}
		return flag;
	}
	//如果用户名存在，获取其下标
	public static int getIndex(String name,String[] nameArray) {
		int index = 0;
		for(int i = 0; i < nameArray.length;i++) {
			if(name.equals(nameArray[i])) {
				index = i;
				break;
			}
		}
		return index;
	}
}

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