job03

import java.util.TreeSet;

/*键盘输入3本书按照价格从低到高排序后输出,如果价格相同则按照书名的自然顺序排序;
**要求:**
1:书以对象形式存在,包含书名和价格(int类型)两个属性;
2:要求即使直接打印书对象的时候,也能看到书的名称和价格,而不是书对象的地址值;
3:分别使用自然排序和比较器排序实现效果;*/
public class job03 {
    public static void main(String[] args) {
        net();
        net2();

    }

    public static void net2() {
        TreeSet<Book1> treeSet1=new TreeSet<Book1>(
                (Book1 a,Book1 b)->{
                    int result=a.getPrice()-b.getPrice();
                    result=(result==0)?a.getName().compareTo(b.getName()):result;
                    return result;
                });
        Book1 bo1=new Book1("水浒传",98);
        Book1 bo2=new Book1("西游记",100);
        Book1 bo3=new Book1("红楼梦",98);
        treeSet1.add(bo1);
        treeSet1.add(bo2);
        treeSet1.add(bo3);
        System.out.println(treeSet1);
    }

    public static void net() {
        TreeSet<Book> treeSet=new TreeSet<>();
        Book b1=new Book("水浒传",98);
        Book b2=new Book("西游记",100);
        Book b3=new Book("红楼梦",98);
        treeSet.add(b1);
        treeSet.add(b2);
        treeSet.add(b3);
        System.out.println(treeSet);
    }
}

public class Book implements Comparable<Book> {
    private String name;
    private int price;

    public Book() {
    }

    public Book(String name, int price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name=‘" + name + ‘\‘‘ +
                ", price=" + price +
                ‘}‘;
    }

    @Override
    public int compareTo(Book o) {
        int result=this.price-o.price;
        result=(result==0)?this.name.compareTo(o.name):result;
        return result;
    }
}

public class Book1 {
    private String name;
    private int price;

    public Book1() {
    }

    public Book1(String name, int price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name=‘" + name + ‘\‘‘ +
                ", price=" + price +
                ‘}‘;
    }
}

job03

原文：https://www.cnblogs.com/xiaofeiji/p/13459021.html