Java实例---简单的投票系统

代码分析

 InputData.java

package vote;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class InputData {
    
    private BufferedReader buf ;
    
    public InputData()
    {
        this.buf = new BufferedReader(new InputStreamReader(System.in));
    }
    
    public String getString(String info)
    {
        String str = null;
        System.out.println(info);
        try {
            str = this.buf.readLine();
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        return str;
        
    }
    
    public int getInt(String info,String error)
    {
        int temp = 0;
        String str = null;
        str = this.getString(info);
        if(str.matches("\d+")){
            temp = Integer.parseInt(str);
        }else{
            System.out.println(error);
        }
                
        return temp;
    }
    
    
}

Person.java

package vote;

public class Person implements Comparable<Person>{
    private String name;
    private int stu_Id;
    
    public Person(String name, int stu_Id, int voteNum) {
        super();
        this.name = name;
        this.stu_Id = stu_Id;
        this.voteNum = voteNum;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getStu_Id() {
        return stu_Id;
    }
    public void setStu_Id(int stu_Id) {
        this.stu_Id = stu_Id;
    }
    public int getVoteNum() {
        return voteNum;
    }
    public void setVoteNum(int voteNum) {
        this.voteNum = voteNum;
    }
    private int  voteNum;

    @Override
    public int compareTo(Person o) {
        // TODO 自动生成的方法存根
        if(this.getVoteNum() > o.getVoteNum())
        {
            return -1;
        }else if(this.getVoteNum() < o.getVoteNum())
        {
            return 1;
        }else
        {
            return 0;
        }
    }
}

VoteOperate.java

package vote;

import java.io.File;
import java.util.Arrays;

public class VoteOperate {
    private Person[] per = {new Person("小米",001,0),new Person("大米",002,0), new Person("玉米",003,0),
        new Person("稀饭",004,0),new Person("刘能",005,0),new Person("逼",006,0)};
    
    private InputData input ;
    private boolean flag = true;
    private int sum;
    private int errorVote;
    
    public VoteOperate()
    {
        this.input =  new InputData();
        while(flag)
        {
            ++sum;
            this.voteForCandidate();
        }
        this.printInfo();
        this.getResulet();
    }
    
    public void voteForCandidate()
    {
        int temp = 0;
        temp = input.getInt("请输入候选人编号(0表示投票结束)", "投票只能是数字，范围0-" + per.length);
        switch (temp) {
        case 1:
        {
            this.per[0].setVoteNum(this.per[0].getVoteNum() + 1);
            break;
        }
        
        case 2:
        {
            this.per[1].setVoteNum(this.per[1].getVoteNum() + 1);
            break;
        }

        case 3:
        {
            this.per[2].setVoteNum(this.per[2].getVoteNum() + 1);
            break;
        }

        case 4:
        {
            this.per[3].setVoteNum(this.per[3].getVoteNum() + 1);
            break;
        }

        case 5:
        {
            this.per[4].setVoteNum(this.per[4].getVoteNum() + 1);
            break;
        }
        case 6:
        {
            this.per[5].setVoteNum(this.per[5].getVoteNum() + 1);
            break;
        }
        case 0:
        {
            System.out.println("退出系统");
            this.flag = false;
            break;
        }
        default:{
            System.out.println("请重新输入一个数字：");
            this.errorVote++;
        }
        }
    }
    
    //打印候选人信息：
        public void printInfo(){    
            for(int i=0;i<per.length;i++){
                System.out.println(this.per[i].getStu_Id() + "："
                    + this.per[i].getName() + "【"+this.per[i].getVoteNum()+"】") ;    
            }
        }
        
    //获取结果    
    public void getResulet(){
        Arrays.sort(per);
        if ((sum - 1 )==0)
        {
            System.out.println("投票故障...");
        }
        else 
        {
            System.out.println("投票最终结果：" + "
共投出：" + ( this.sum  - 1 )+ "票,其中，错误投票 : " + this.errorVote + "票，有效票" + ( this.sum  - 1 - this.errorVote) + "
" 
           + this.per[0].getName()+"同学，最后以"+this.per[0].getVoteNum()+"票当选班长！") ;
        }
    };
    
}

Test.java

package vote;
    
public class Test {
    public static void main(String[] args) {
        new VoteOperate();
    }
}

效果截图

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