Java（17） Set

package bean;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@NoArgsConstructor
@AllArgsConstructor
public class Book implements Comparable {
    
    private String name;
    
    private String author;
    
    private int price;
    
    private int sales;

    @Override
    public int compareTo(Object o) {
        Book book = (Book) o;
        int x = this.author.compareTo(book.getAuthor());
        int y = this.price - book.getPrice();
        int z = this.sales - book.getSales();
        int k = this.name.compareTo(book.getName());
        if (x != 0) {
            return x;
        } else if (y != 0) {
            return -y;
        } else if (z != 0) {
            return -z;
        } else if (k != 0) {
            return k;
        } else {
            return 0;
        }
    }
}

package Test.set;

import bean.Book;
import org.junit.jupiter.api.Test;

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;


public class TreeSetTest {
    @Test
    public void test(){
        Set books = new TreeSet<>();
        // books.add(new Book("f", "B", 35, 180));
        books.add(new Book("a", "A", 35, 150));
        books.add(new Book("b", "B", 35, 150));
        books.add(new Book("c", "A", 33, 150));
        books.add(new Book("d", "B", 33, 150));
        books.add(new Book("e", "A", 35, 180));
        books.add(new Book("f", "B", 35, 180));
        Iterator it = books.iterator();
        while (it.hasNext()){
            Book book = it.next();
            System.out.println(book);
        }
        
    }
}

package Test.set;

import org.junit.jupiter.api.Test;

import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;


public class LinkedHashSetTest {
    @Test
    public void test01() {
        Set set = new HashSet();
        byte a = 1;
        short b = 2;
        int c = 3;
        long d = 4L;
        double e = 5.0d;
        float f = 6.0f;
        char g = 'a';
        boolean h = false;
        set.add(a);
        set.add(b);
        set.add(c);
        set.add(d);
        set.add(e);
        set.add(f);
        set.add(g);
        set.add(h);
        set.add(a);
        System.out.println(set);
    }
//[6.0, 1, a, 2, 3, 4, 5.0, false]
    @Test
    public void test02() {
        Set set = new LinkedHashSet();
        byte a = 1;
        short b = 2;
        int c = 3;
        long d = 4L;
        double e = 5.0d;
        float f = 6.0f;
        char g = 'a';
        boolean h = false;
        set.add(a);
        set.add(b);
        set.add(c);
        set.add(d);
        set.add(e);
        set.add(f);
        set.add(g);
        set.add(h);
        set.add(a);
        System.out.println(set);
    }
//[1, 2, 3, 4, 5.0, 6.0, a, false]
    @Test
    public void test03() {
        Set set = new LinkedHashSet();
        set.add(2);
        set.add(1);
        set.add(1);
        System.out.println(set);
    }
//[2, 1]
    @Test
    public void test04() {
        Set set = new LinkedHashSet<>();
        for (int i = 0; i < 5; i++) {
            set.add("xm" + (i + 1));
        }
        System.out.println(set);
        for (String name : set) {
            System.out.println(name);
        }
    }

    @Test
    public void test05() {
        Set set = new LinkedHashSet<>();
        for (int i = 0; i < 5; i++) {
            set.add("xm" + (i + 1));
        }
        System.out.println(set);
        Iterator it = set.iterator();
        while (it.hasNext()) {
            String name = it.next();
            System.out.println(name);
        }
    }

}

package Test.set;

import org.junit.jupiter.api.Test;

import java.util.*;


public class HashSetTest {
    @Test
    public void test01() {
        List list = new ArrayList();
        byte a = 1;
        short b = 2;
        int c = 3;
        long d = 4L;
        double e = 5.0d;
        float f = 6.0f;
        char g = 'a';
        boolean h = false;
        list.add(a);
        list.add(b);
        list.add(c);
        list.add(d);
        list.add(e);
        list.add(f);
        list.add(g);
        list.add(h);
        list.add(a);
        System.out.println(list);
    }
//[1, 2, 3, 4, 5.0, 6.0, a, false, 1]
    @Test
    public void test02() {
        Set set = new HashSet();
        byte a = 1;
        short b = 2;
        int c = 3;
        long d = 4L;
        double e = 5.0d;
        float f = 6.0f;
        char g = 'a';
        boolean h = false;
        set.add(a);
        set.add(b);
        set.add(c);
        set.add(d);
        set.add(e);
        set.add(f);
        set.add(g);
        set.add(h);
        set.add(a);
        System.out.println(set);
    }
//[6.0, 1, a, 2, 3, 4, 5.0, false]
    @Test
    public void test03() {
        Set set = new HashSet();
        set.add(2);
        set.add(1);
        set.add(1);
        System.out.println(set);
    }
//[1, 2]
    @Test
    public void test04() {
        Set set = new HashSet<>();
        for (int i = 0; i < 5; i++) {
            set.add("xm" + (i + 1));
        }
        System.out.println(set);
        for (String name : set) {
            System.out.println(name);
        }
    }

    @Test
    public void test05() {
        Set set = new HashSet<>();
        for (int i = 0; i < 5; i++) {
            set.add("xm" + (i + 1));
        }
        System.out.println(set);
        Iterator it = set.iterator();
        while (it.hasNext()) {
            String name = it.next();
            System.out.println(name);
        }
    }

}