Question

怎么用java升级菜单切换？

Answer 1

import java.util.Scanner;

public class Menu {

/**
* @param args
*/
public static void main(String[] args) {
PrintMenu();

int answer = 0;//保存用户的输入的答案
System.out.println("请选择，输入数字:");
Scanner sc = new Scanner(System.in);
answer = sc.nextInt();
do {

if (answer > 4 && answer < 1) {
System.out.println("输入错误，请重新输入数字:");
answer = sc.nextInt();
} else {
switch (answer) {
case 1:
System.out.println("正在进入客户信息管理.......");
return;

case 2:
System.out.println("正在进行购物结算.....");
return;
case 3:
System.out.println("正在进入真情回馈....");
return;
case 4:
System.out.println("正在注销....");
return;
}
}

} while (true);

}

/**
* 打印菜单的方法
*/
public static void PrintMenu() {
System.out.println("*******************");
System.out.println(" 1.客户信息管理");
System.out.println(" 2.购物结算");
System.out.println(" 3.真情回馈");
System.out.println(" 4.注销");
System.out.println("*******************");
}

}