import java.util.Scanner;
public class trice {
public static void main(String[]args){
System.out.println("欢迎使用myshopping管理系统");
System.out.println("");
System.out.println("");
System.out.println("*************************");
System.out.println("\t1.客户信息管理");
System.out.println("\t2.购物结算");
System.out.println("\t3.真情回顾");
System.out.println("\t4.注销");
System.out.println("**************************");
System.out.println("请输入选项");
Scanner input = new Scanner(System.in);
int tger ;
boolean isRisght;
do{
tger = input.nextInt();
isRisght = true;
if(isRisght){
switch(tger){
case 1:
System.out.println("张浩,男,19岁");
break ;
case 2:
System.out.println("执行购物结算");
break ;
case 3 :
System.out.println("执行真情回顾");
break;
case 4 :
System.out.println("推出");
break ;
default:
System.out.println("输入不对");
}
}else{
System.out.println("输入正确的选项");
tger = input.nextInt();
}
}while(isRisght);
System.out.println("程序结束");
}
}
为什么不跳出呢??
public class trice {
public static void main(String[]args){
System.out.println("欢迎使用myshopping管理系统");
System.out.println("");
System.out.println("");
System.out.println("*************************");
System.out.println("\t1.客户信息管理");
System.out.println("\t2.购物结算");
System.out.println("\t3.真情回顾");
System.out.println("\t4.注销");
System.out.println("**************************");
System.out.println("请输入选项");
Scanner input = new Scanner(System.in);
int tger ;
boolean isRisght;
do{
tger = input.nextInt();
isRisght = true;
if(isRisght){
switch(tger){
case 1:
System.out.println("张浩,男,19岁");
break ;
case 2:
System.out.println("执行购物结算");
break ;
case 3 :
System.out.println("执行真情回顾");
break;
case 4 :
System.out.println("推出");
break ;
default:
System.out.println("输入不对");
}
}else{
System.out.println("输入正确的选项");
tger = input.nextInt();
}
}while(isRisght);
System.out.println("程序结束");
}
}
为什么不跳出呢??
case 4:
System.out.println("退出");
System.exit(0);
break;
public class Test {
public static void main(String[]args){
System.out.println("欢迎使用myshopping管理系统");
System.out.println("");
System.out.println("");
System.out.println("*************************");
System.out.println("\t1.客户信息管理");
System.out.println("\t2.购物结算");
System.out.println("\t3.真情回顾");
System.out.println("\t4.注销");
System.out.println("**************************");
System.out.println("请输入选项");
Scanner input = new Scanner(System.in);
int tger ;
boolean isRisght;
flag:
do{
tger = input.nextInt();
isRisght = true;
if(isRisght){
switch(tger){
case 1:
System.out.println("张浩,男,19岁");
break ;
case 2:
System.out.println("执行购物结算");
break ;
case 3 :
System.out.println("执行真情回顾");
break;
case 4 :
System.out.println("推出");
break flag;
default:
System.out.println("输入不对");
} }else{
System.out.println("输入正确的选项");
tger = input.nextInt();
}
}while(isRisght);
System.out.println("程序结束");
}}
//你的while一直true while (!isRisght);
package csdn;import java.util.Scanner;public class Trice {
public static void main(String[] args) {
System.out.println("欢迎使用myshopping管理系统");
System.out.println("");
System.out.println("");
System.out.println("*************************");
System.out.println("\t1.客户信息管理");
System.out.println("\t2.购物结算");
System.out.println("\t3.真情回顾");
System.out.println("\t4.注销");
System.out.println("**************************");
System.out.println("请输入选项");
Scanner input = new Scanner(System.in);
int tger;
boolean isRisght;
do {
tger = input.nextInt();
isRisght = true;
if (isRisght) {
switch (tger) {
case 1:
System.out.println("张浩,男,19岁");
break;
case 2:
System.out.println("执行购物结算");
break;
case 3:
System.out.println("执行真情回顾");
break;
case 4:
System.out.println("退出");
break;
default:
System.out.println("输入不对");
} } else {
System.out.println("输入正确的选项");
tger = input.nextInt();
}
} while (!isRisght);
System.out.println("程序结束");
}}
aa:{
....代码1
....代码2
....代码3
break aa;
}
在break后面加上标记名,就跳出整个大括弧了。不写大括弧也可以。
你声明的boolean的类型,一直为true,有什么作用,你因该用个判断的逻辑,在某种情况下改变这个boolean的值!不然的话这个do..While是个死循环,程序永远不会终止了!
虽然不知道你最终目的是什么!我把你的程序改动了一下,你看能不能用!import java.util.Scanner;
import java.util.regex.Pattern;
public class Test {
public static void main(String[]args){
System.out.println("欢迎使用myshopping管理系统");
System.out.println("");
System.out.println("");
System.out.println("*************************");
System.out.println("\t1.客户信息管理");
System.out.println("\t2.购物结算");
System.out.println("\t3.真情回顾");
System.out.println("\t4.注销");
System.out.println("**************************");
System.out.println("请输入选项");
Scanner input = new Scanner(System.in);
int tger ;
boolean isRisght;
boolean isRisght2=true;
tger = input.nextInt();
flag:
do{
if(Pattern.compile("[0-9]").matcher(""+tger).find())
{
isRisght = true;
}
else
{
isRisght=false;
}
if(isRisght){
switch(tger){
case 1:
System.out.println("张浩,男,19岁");
break ;
case 2:
System.out.println("执行购物结算");
break ;
case 3 :
System.out.println("执行真情回顾");
break;
case 4 :
System.out.println("推出");
break flag;
default:
System.out.println("输入不对");
}
Scanner input1 = new Scanner(System.in);
System.out.println("请问是否继续,(Y或y继续)任意字符退出");
String str=input1.nextLine();
if(str.charAt(0)=='y'||str.charAt(0)=='Y')
{
isRisght2=true;
System.out.println("请输入选项");
tger = input.nextInt();
}
else{
isRisght2=false;
}
}else{
System.out.println("输入正确的选项");
tger = input.nextInt();
}
}while(isRisght2);
System.out.println("程序结束");
}}
import java.util.Scanner;
public class trice {
public static void main(String[] args) {
System.out.println("欢迎使用MyShopping管理系统\n");
System.out.println("*******************************");
System.out.println("\t1.客 户 信 息 管 理");
System.out.println("\t2.购 物 结 算");
System.out.println("\t3.真 情 回 馈");
System.out.println("\t4.注 销");
System.out.println("*******************************\n");
int choice; //用户选择
boolean isRight; //输入是否正确
System.out.print("请选择,输入数字:");
Scanner input = new Scanner(System.in);
do{
isRight = true;
choice = input.nextInt();
/*
* if(choice == 1){
System.out.println("执行客户信息管理");
}else if(choice == 2){
System.out.println("执行购物结算");
}else if(choice == 3){
System.out.println("执行真情回馈");
}else if(choice == 4){
System.out.println("执行注销");
}else{
System.out.print("输入错误,请重新输入数字:");
isRight = false;
}
*/
switch(choice){
case 1:
System.out.println("执行客户信息管理");
break;
case 2:
System.out.println("执行购物结算");
break;
case 3:
System.out.println("执行真情回馈");
break;
case 4:
System.out.println("执行注销");
break;
default :
System.out.print("输入错误,请重新输入数字:");
isRight = false;
break;
}
}while(!isRight);
System.out.println("\n程序结束");
}
}
谢谢大家了 ,我昨天晚上应经解决了。麻烦大家了,确实有点乱