java数组--对象数组的随机赋值及其他

包含考点：

1. 对象数组的随机赋值
2. 浮点数的指定位数
3. 换用思路进行对象数组的某一属性进行排序

现有Book类，定义如下：

private String author;

private String ISBN;//书号

private double price;

public String getAuthor() {return this.author;}

public void setAuthor(String author) {this.author = author;}

public String getISBN() {return this.ISBN;}

public void setISBN(String ISBN) {this.ISBN = ISBN;}

public double getPrice() {return this.price;}

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

请用一个数组存放随机产生的10个书籍对象，并显示其中书价最高的书号（要求使用对象数组完成）

package javaPractice;

import java.text.*;
import java.util.*;

public class TestBook {
	public static void main(String[] argsment) {
		Book[] book = new Book[10];
		int j=0,k=0;
		String[] name1 = {"杨红云","吴军","屈婉玲","李开复","凡尔纳","王小波"};
		String[] name2 = {"ISBN 962-215-001-2","ISBN 962-215-001-3","ISBN 962-215-001-4","ISBN 962-215-001-5","ISBN 962-215-001-6","ISBN 962-215-001-8","ISBN 962-215-002-21"};
		Random random = new Random();
		DecimalFormat df = new DecimalFormat( "0.00");
		double[] arr = new double[10];
		for(int i=0;i<book.length;i++) {
			book[i] = new Book();
		}
		for(int i=0;i<book.length;i++) {
			j = random.nextInt(name1.length);
			k = random.nextInt(name2.length);
			book[i].setAuthor(name1[j]);
			book[i].setISBN(name2[k]);;
			book[i].setPrice(random.nextDouble()*200);
			arr[i] = book[i].getPrice();
		}
		for(int i=0;i<book.length;i++) {
			System.out.print("author:"+book[i].getAuthor());
			System.out.print("  "+book[i].getISBN());
			System.out.println("  price:"+df.format(book[i].getPrice()));
		}
        Arrays.sort(arr);
        for(int i=0;i<book.length;i++) {
        	if(book[i].getPrice() == arr[arr.length-1]) {
        		System.out.println("书价最高图书的书号为"+book[i].getISBN());
        	}
        }
	}
}

class Book{
	private String author;
	private String ISBN;//书号
	private double price;

	public String getAuthor() {return this.author;}
	public void setAuthor(String author) {this.author = author;}

	public String getISBN() {return this.ISBN;}
	public void setISBN(String ISBN) {this.ISBN = ISBN;}

	public double getPrice() {return this.price;}
	public void setPrice(double price) {this.price = price;}
}