Question

我有一个包含许多对象的数组列表。我想从它删除重复的对象..我尝试使用TreeSet和Comparator下面的选项，但它不起作用。以下类对象添加在列表

中

    public class Student {
    private String name;
    private String location;
    private int score;
    private int age;
    private String department;

    Student(){}
    Student(String sName,String loc,int ag,int scr,String dep){
        setName(sName);
        setLocation(loc);
        setScore(scr);
        setAge(ag);
        setDepartment(dep);
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getLocation() {
        return location;
    }
    public void setLocation(String location) {
        this.location = location;
    }
    public int getScore() {
        return score;
    }
    public void setScore(int score) {
        this.score = score;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getDepartment() {
        return department;
    }
    public void setDepartment(String department) {
        this.department = department;
    }


}

以下是我的主要课程

import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;


public class MyMain {
    public static void main(String[] args) {
        Student s1= new Student("John","Aus",25,100,"Finance");
        Student s2= new Student("John","Aus",25,100,"Finance");
        Student s3= new Student("John","Aus",26,100,"Finance");
        Student s4= new Student("Alex","Ind",20,101,"Finance");
        Student s5= new Student("Alex","Ind",20,101,"Finance");
        Student s6= new Student("Alex","Ind",28,101,"Finance");
        ArrayList<Student> studentsList= new ArrayList<Student>();

        studentsList.add(s1);
        studentsList.add(s2);
        studentsList.add(s3);
        studentsList.add(s4);
        studentsList.add(s5);
        studentsList.add(s6);       

        for(int i=0;i<studentsList.size();i++){
            Student s=(Student)studentsList.get(i);
            System.out.println(i+ "  "+s.getName()+" "+s.getLocation()+" "+s.getAge()+" "+s.getScore()+" "+s.getDepartment());
        }

        Set set = new TreeSet(new Comparator<Student>() {

            @Override
            public int compare(Student s1, Student s2) {
                if( s1.getName().equalsIgnoreCase(s2.getName()) && s1.getLocation().equalsIgnoreCase(s2.getLocation()) && s1.getScore()==s2.getScore()){
                    return 0;
                }               
                return 1;
            }



        });     
        set.addAll(studentsList);
        studentsList.clear();
        studentsList.addAll(set);

        System.out.println("---------Final Result----------");
        for(int i=0;i<studentsList.size();i++){
            Student s=(Student)studentsList.get(i);
            System.out.println(i+ "  "+s.getName()+" "+s.getLocation()+" "+s.getAge()+" "+s.getScore()+" "+s.getDepartment());
        }       

    }

}

我想从列表中删除包含相同＆＃39;名称＆＃39;，＆＃39;位置＆＃39;和＆＃39;得分＆＃39;

我在运行程序时得到以下输出

0  John Aus 100 25 Finance
1  John Aus 100 26 Finance
2  Alex Ind 101 20 Finance
3  Alex Ind 101 28 Finance

但是我的预期输出是

0  John Aus 100 25 Finance
1  Alex Ind 101 20 Finance

请帮我解决这个问题。这种方法是否正确？另外，我想保持Student类的完整性（不能覆盖equals和hashCode）

请咨询

Answer 1

你发布的结果是有效的

在你的comperator中检查：

名称
位置
得分

这就是为什么你会得到重复的原因 - 因为分数不同.. 你刚刚超过年龄和得分参数

Student(String sName,String loc,int scr,int ag,String dep)

Student s1= new Student("John","Aus",25,100,"Finance");

忽略对象的Arraylist中的重复项

1 个答案:

你发布的结果是有效的