我主要问的是while (a<1 || a>3)
{
try{
System.out.println("输入错误，请输入1,2,3");
Scanner src=new Scanner(System.in);
a=src.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("输入不符合规定！");
}
}这一块代码我想循环判断输入数据是否为1，2，3 不是的话就抛出异常循环输入 直到输入正确这段代码我写到一个类的方法里了 所有代码如下 求高手指点下 俺是初学者
import java.util.InputMismatchException;
import java.util.Scanner;
public class Compoter { public static String name;
public static int score=0;
public static String chuquan;
public static int cishu;
public static int score1=0;
public static int j=0;
public void showFist()
{
}
public static String xingming (int a)
{
switch (a)
{
case 1:name="刘备";break;
case 2:name="孙权";break;
case 3:name="曹操";break;
}
return name;
}
public static String dianchu(int sum)
{
switch (sum)
{
case 1:chuquan="石头";break;
case 2:chuquan="剪刀";break;
case 3:chuquan="布";break;
}
return chuquan;
}
public static void jieguo(int sub,int sum)
{
if (sub==sum)
{
System.out.println("你们两个打平手了！");
j++;
}
if(sub==1 && sum==2)
{
System.out.println("您赢了！");
score-=1;
score1+=1;
}
if (sub==1&&sum==3)
{
System.out.println("您输了！");
score+=1;
score1-=1;
}
if (sub==2 && sum==1)
{
System.out.println("您输了！");
score+=1;
score1-=1;
}
if (sub==2 && sum==3)
{
System.out.println("您赢了！");
score-=1;
score1+=1;
}
if (sub==3 && sum==1)
{
System.out.println("您赢了！");
score-=1;
score1+=1;
}
if (sub==3 && sum==2)
{
System.out.println("您输了！");
score+=1;
score1-=1;
}
}
public static int cuowu(int a)
{
while (a<1 || a>3)
{
try{
System.out.println("输入错误，请输入1,2,3");
Scanner src=new Scanner(System.in);
a=src.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("输入不符合规定！");
}
}
return a;
}}public class People {
public static String name1;
public int score1;
public static String chuquan1;
public void showFist()
{
} public static String renchu(int sub)
{
switch (sub)
{
case 1:chuquan1="石头";break;
case 2:chuquan1="剪刀";break;
case 3:chuquan1="布";break;
}
return chuquan1;
}
}
import java.util.Random;
import java.util.Scanner;
public class Test { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("出拳规则：1.剪刀2.石头3.布");
System.out.print("请选择对方角色：（1.刘备2.孙权3.曹操）:");
Scanner src=new Scanner(System.in);
int a=src.nextInt(); a=Compoter.cuowu(a);
Compoter.xingming(a);
System.out.print("请输入您的姓名：");
System.out.println();
String b=src.next();
Compoter.xingming(a);
System.out.println(b+" VS "+Compoter.name+" 对战");
System.out.print("要开始么？（y/n）");
String xuanze=src.next();
String jixu="y";
String tuichu="n";
while (xuanze.equals(xuanze!=jixu) && xuanze.equals(xuanze!=tuichu))
{
System.out.println("输入错误！请重新输入！y/n");
xuanze=src.next();
}
int i=0;
while (xuanze.equals("y"))
{
i++;
Random sr=new Random();
int sum=sr.nextInt(3)+1;
System.out.println("请出拳：1石头.2剪刀.3.布（输入相应数字）:");
int sub=src.nextInt();
Compoter.cuowu(sub);
sub=Compoter.cuowu(a);
People.renchu(sub);
System.out.println("你出拳："+People.chuquan1);
Compoter.dianchu(sum);
System.out.println(Compoter.name+" 出拳 "+Compoter.chuquan);
Compoter.jieguo(sub,sum);
System.out.println("是否开始下一轮：(y/n)");
xuanze=src.next();
}
if (xuanze.equals("n"))
{
System.out.println("猜拳结束！您一共进行了"+i+"次游戏！");
System.out.println(b+" VS "+Compoter.name+" 对战");
System.out.println("对战次数："+i+" 平手次数"+Compoter.j);
System.out.println(b+"得分："+Compoter.score1);
System.out.println(Compoter.name+"得分"+Compoter.score);
if (Compoter.score==Compoter.score1)
{
System.out.println("结果为：奥，你们打平了！改日再战！一决高下哦！");
}
if (Compoter.score<Compoter.score1)
{
System.out.println("结果为："+b+"战胜了"+Compoter.name);
}
if (Compoter.score>Compoter.score1)
{
System.out.println("结果为："+Compoter.name+"战胜了"+b);
}
} } }
try catch
{
try{
System.out.println("输入错误，请输入1,2,3");
Scanner src=new Scanner(System.in);
a=src.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("输入不符合规定！");
}