程序代码：

public class Student {
    private int No;
    private String name;
    protected int vote;
    public Student(int No,String name,int vote){
        this.setNo(No);
        this.setName(name);
        this.setVote(vote);
    }

    public int getNo() {
        return No;
    }
    public void setNo(int no) {
        No = no;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getVote() {
        return vote;
    }
    public void setVote(int vote) {
        this.vote = vote;
    }
}

程序代码：

import java.util.Arrays;
import java.util.Scanner;


public  class VotePart{
    private Student stu[]= {new Student(1,"张三",0),new Student(2,"李四",0),new Student(3,"王五",0),new Student(4,"赵六",0)};
    public void print(){
        for (int i=0;i<this.stu.length;i++){
            System.out.println(this.stu[i].getNo()+":"+this.stu[i].getName()+"【"+this.stu[i].getVote()+"】");
        }
    }
    public void Operate(){
        this.print();
        this.vote();
        this.print();
        this.getResult();
    }
    public void vote(){
        boolean flag = false;
        while(flag==false){
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入班长候选人代号（数字0结束）：");
        String id=sc.next();

        switch (id){
        case "0":{
            flag = true;
            break;
        }
        case "1":{
            this.stu[0].setVote(this.stu[0].getVote()+1);
            break;
        }
        case "2":{
            this.stu[1].setVote(this.stu[1].getVote()+1);
            break;
        }
        case "3":{
            this.stu[2].setVote(this.stu[2].getVote()+1);
            break;
        }
        case "4":{
            this.stu[3].setVote(this.stu[3].getVote()+1);
            break;
        }
        default:{
            System.out.println("次选票无效，请输入正确的候选人代号！");
        }}}
        
        
    }
        public void getResult(){
                //这里缺少将对象数组排序的代码
        System.out.println("投票最终结果："+this.stu[0].getName()+"同学，最后以"+this.stu[0].getVote()+"票当选班长！");
        }
        }

程序代码：

public class Demo {

    public static void main(String[] args) {
        new VotePart().Operate();
    }

}