Java整形检测输入字符字符串方法

另一个博客java扑克牌小游戏里面用到的整形检测输入的是字符字符串 

静态变量 + 函数递归 

package game;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Game {
	
	static int vu = 0;
	static int wgold = 100;
	static int dgold = 100;
	
	public static void Hs(int hs){//计算花色
		hs/=13;
		if(hs==4){
			hs=3;
		}
		switch (hs) {
		case 0:
			System.out.print("黑桃");
			break;
		case 1:
			System.out.print("梅花");
			break;
		case 2:
			System.out.print("方块");
			break;
		case 3:
			System.out.print("红桃");
			break;
		}
	}
	
	public static void Enter() throws IOException  {//停顿
			System.out.println("按回车继续");
			new BufferedReader(new InputStreamReader(System.in)).readLine();
	}
	
	private static void Pai(int pai) {
		switch (pai) {
		case 1:
			System.out.println("A");
			break;
		case 11:
			System.out.println("J");
			break;
		case 12:
			System.out.println("Q");
			break;
		case 13:
			System.out.println("K");
			break;
		default:
			System.out.println(pai);
			break;
		}
	}
	
	public static void main(String[] args) throws IOException {
		Scanner input = new Scanner(System.in);
		System.out.println("                   抽牌游戏                                                     ");
		System.out.println("游戏规则");
		System.out.println("比大小，A最大  。牌大小一样比花色，黑桃最大，其次是梅花，方块，红桃");
		System.out.println("初始金币  玩家 100 电脑金币 100\n开始自动下注10金币");
		while(wgold>0){
			while(dgold>0){
				Enter();
				wgold-=10;
				dgold-=10;
				System.out.println("玩家金币 "+wgold+"\n电脑金币 "+dgold);
				System.out.println("玩家抽牌");
				Enter();
				int hs,pai;//玩家牌花色，牌数
				int dhs,dpai;//电脑牌花色，牌数
				hs=(int)(1+Math.random()*52);//玩家抽的花色
				pai=(int)(1+Math.random()*13);//玩家抽的牌
				Hs(hs);
				Pai(pai);
				System.out.println("请问是否加注  加注输入加注金币数(不能超过现有金币数)  不加注输入0   电脑自动跟");
				jwvu();
				if(pai==1){
					pai=14;//A最大
				}
				Enter();
				System.out.println("电脑抽牌");
				dhs=(int)(1+Math.random()*52);
				dpai=(int)(1+Math.random()*13);
				Hs(dhs);
				Pai(dpai);
				if(pai>dpai){
					System.out.println("玩家胜利");
					if(vu==0){
						wgold+=10*2;
					}else{
						wgold+=10*2+vu*2;
					}
					System.out.println("玩家金币"+wgold+"电脑金币"+dgold);
					Enter();
				}else if(pai<dpai){
					System.out.println("电脑胜利");
					if(vu==0){
						dgold+=10*2;
					}else{
						dgold+=10*2+vu*2;
					}
					System.out.println("玩家金币"+wgold+"电脑金币"+dgold);
					Enter();
				}else if(pai==dpai){
					if(hs<dhs){
						System.out.println("玩家胜利");
						if(vu==0){
							wgold+=10*2;
						}else{
							wgold+=10*2+vu*2;
						}
						System.out.println("玩家金币"+wgold+"电脑金币"+dgold);
						Enter();
					}else if(hs>dhs){
						System.out.println("电脑胜利");
						if(vu==0){
							dgold+=10*2;
						}else{
							dgold+=10*2+vu*2;
						}
						System.out.println("玩家金币"+wgold+"电脑金币"+dgold);
						Enter();
					}else{
						System.out.println("平局");
						if(vu==0){
							dgold+=10;
							wgold+=10;
						}else{
							dgold+=10+vu;
							wgold+=10+vu;
						}
						System.out.println("玩家金币"+wgold+"电脑金币"+dgold);
						Enter();
					}
				}
				if(wgold==0 || dgold==0)break;
			}
			if(wgold==0 || dgold==0)break;
		}
		if(wgold<=0)System.out.println("！！！电脑最终获胜！！！");
		if(dgold<=0)System.out.println("！！！玩家最终获胜！！！");
	}

	public static void jwvu(){//控制加注数输入
		while(true){
			Scanner input = new Scanner(System.in);
			if(input.hasNextInt()){
				vu = input.nextInt();
				}else{
				System.out.println("... 金币用整数计算  重新输入");
				jwvu();
				break;
				}
			if(vu==0){
				break;
			}else if(vu>0 && vu<=wgold){
				System.out.println("已加注");
				wgold-=vu;
				if(dgold>vu){
					dgold-=vu;
				}else{
					dgold-=dgold;
				}break;
			}else{
				System.out.println("输入错误 重新输入");
				continue;
			}
		}
	}
}