<pre class="cpp" name="code"><img src="https://img-blog.csdn.net/20171130174554451" alt="">package Kuang;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
public class Test {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        List<Book> bookList = new ArrayList<Book>();
        bookList.add(new Book("英语", 29.99));
        bookList.add(new Book("数学", 50));
        bookList.add(new Book("化学", 30));
        bookList.add(new Book("生物", 30));
        bookList.add(new Book("历史", 30));
        System.out.println("请输入价格：\n");
        Book book = new Book("对比价格", 50);
        System.out.println(book.name + book.price);
        for (int i = 0; i < bookList.size(); i++
                /* Book books:bookList)*/)
        {
            if (book.compareTo(bookList.get(i)/*books*/) == 0)
            System.out.println((bookList.get(i)/*books*/.name));
            //+ (bookList.get(i)/*books*/.price)));

        }System.out.println("价格相同的:"+(book.price));
        // Map<Book> bookmap = new HashMap<Book>();
        // bookmap.put("english","18.5");
        // bookmap.put("math","18.5");
        // bookmap.put("chinese","18");
        // bookmap.put("生物","185");
        // bookmap.put("化学","15");
        // bookmap.put("历史","8.5");
        // System.out.println("请输入您要搜索的价格：\n");
        // Scanner input = new Scanner(System.in);
    }

}</pre><br>
package Kuang;public class Book implements Comparable<Book>{String name;Double price;public Book (String nm,double p){name=nm;price=p;}@Overridepublic int compareTo(Book o) {           // TODO Auto-generated method stubreturn this.price.compareTo(o.price);}}
<pre></pre>
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