再来练一遍，模拟键盘输入数字，找出最大值和最小值_输入一个数,模拟键盘输入一遍-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_27347147/article/details/85145603

本文介绍了一个Java程序，用于从用户输入中获取一系列整数，并找出这些整数中的最大值和最小值。通过工厂模式创建了一个接口实现类，该类利用InputUtil工具类读取用户输入并验证是否为数字。

package yn.ngems.cn.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class InputUtil {
   public static int getNumber(String warn) {
       BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
       int num = 0;
       String str = null;
       boolean flag = true;
       System.out.print(warn);
       while(flag) {
           try {
               str = buf.readLine();
           } catch (IOException e) {
               e.printStackTrace();
           }
           if(str.matches("\\d+")) {
               num = Integer.parseInt(str);
               flag = false;
           }else {
               System.out.print("不是数字，重新输入：");
           }
       }
       return num;
   }
}
package yn.ngems.cn.Iinterface;
public interface ICompareNumber {
   public int [] getCompareNumbers(int count) ;
}

package yn.ngems.cn.IinterfaceImpl;
import yn.ngems.cn.Iinterface.ICompareNumber;
import yn.ngems.cn.util.InputUtil;
public class ICompareNumberImpl implements ICompareNumber{
   public ICompareNumberImpl() {}
   /**
   * return data[2],最大值：data[0],最小值：data[1]
   */
   @Override
   public int[] getCompareNumbers(int count) {
       int num [] = new int [count];
       int data [] = new int [2];
       for(int x = 0;x < num.length;x ++) {
           num[x] = InputUtil.getNumber("请输入第" + (x + 1) + "个数字：");
       }
       data[0] = num[0];
       data[1] = num[0];
       for(int x = 0;x <num.length;x ++) {
           if(num[x] > data[0]) {
               data[0] = num[x];
           }
           if(num[x] < data[1]) {
               data[1] = num[x];
           }
       }
       return data;
   }

}
package yn.ngems.cn.factory;
import yn.ngems.cn.Iinterface.ICompareNumber;
import yn.ngems.cn.IinterfaceImpl.ICompareNumberImpl;
public class Factory {
   public static ICompareNumber getInstance() {
       return new ICompareNumberImpl();
   }
}

package yn.ngems.cn.test;

import yn.ngems.cn.Iinterface.ICompareNumber;
import yn.ngems.cn.factory.Factory;

public class TestCompareNumberDemo {
   public static void main(String[] args) {
       ICompareNumber icNumber = Factory.getInstance();
       int results [] = icNumber.getCompareNumbers(7);
       System.out.println("最大值：" + results[0] + "、最小值：" + results[1]);
   }
}