java数组排序练习

书名长度排序

package com.hspedu;
 
import com.sun.org.apache.bcel.internal.generic.IF_ACMPEQ;
 
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Comparator;
import java.util.Date;
 
/**
 * @author: guorui fu
 * @versiion: 1.0
 */
public class ArrayExercise {
    public static void main(String[] args) {
        Book[] books = new Book[4];
        books[0] = new Book("红楼梦",1000);
        books[1] = new Book("金瓶梅新",90);
        books[2] = new Book("青年文摘20年",5);
        books[3] = new Book("java从入门到放弃",300);
        Arrays.copyOf(books,3);
        //按照名字长度大小进行数组排序
        Arrays.sort(books, new Comparator() {
            @Override
            public int compare(Object o1, Object o2) {
                Book i1 = (Book) o1;
                Book i2 = (Book) o2;
                int minus = i1.getName().length() - i2.getName().length();
                if (minus > 0){
                    return -1;
                } else if (minus < 0){
                    return 1;
                } else {
                    return 0;
                }
            }
        });
        System.out.println(Arrays.toString(books));
 
        //Date类的时间运用
        Date date = new Date();
        System.out.println(date);
 
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss E");
        String format = sdf.format(date);
        System.out.println(format);
        
    }
}
class Book{
    private String name;
    private int price;
 
    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 '{' + name + '\'' + price + "元}";
    }
    @Override
    protected void finalize() throws Throwable {
        super.finalize();
    }
}