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：" + "\n共投出：" + ( this.sum  - 1 )+ "票,其中，错误投票 : " + this.errorVote + "票，有效票" + ( this.sum  - 1 - this.errorVote) + "\n"
            + 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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