我现在有一个集合List<Book>;里边有两个Book,public class Book {
private String author;
private String bookName;
private int bookPrice;
}我现在想。从List<Book> 中取出每一个属性放到一个二维数组中。
public String[][] child= {
{ "author1", "bookName1", "bookPrice1"},
{ "author2", "bookName2", "bookPrice2"},
{ "author3", "bookName3", "bookPrice3"}
};
需要怎么处理。
private String author;
private String bookName;
private int bookPrice;
}我现在想。从List<Book> 中取出每一个属性放到一个二维数组中。
public String[][] child= {
{ "author1", "bookName1", "bookPrice1"},
{ "author2", "bookName2", "bookPrice2"},
{ "author3", "bookName3", "bookPrice3"}
};
需要怎么处理。
book1.setAuthor("aa");
book1.setBookName("aa");
book1.setBookPrice(11);
books.add(book1);Book book2 = new Book();
book2.setAuthor("bb");
book2.setBookName("bb");
book2.setBookPrice(22);
books.add(book2);String[][] child= new String[books.size()][3];
for (int i = 0; i < books.size(); i++) {
Book book = books.get(i);
child[i][0] = book.getAuthor();
child[i][1] = book.getBookName();
child[i][2] = book.getBookPrice() + "";
}
for (int i = 0; i < child.length; i++) {
for (int j = 0; j < child[0].length; j++) {
System.out.print(child[i][j] + "===");
}
System.out.println();
}结果
aa===aa===11===
bb===bb===22===
int length=b.size();
String[][] a=new String[length][3];
for(int i=0;i<length;i++){
Book temp=b.get(i);
a[i][0] = temp.getAuthor();
a[i][1] = temp.getBookName();
a[i][2] = ""+temp.getBookPrice();
}
return a;
}
import java.util.List;
import java.util.ArrayList;
class Book
{
private String author;
private String bookName;
private int bookPrice;
public Book(String author,String bookName,int bookPrice)
{
this.author=author;
this.bookName=bookName;
this.bookPrice=bookPrice;
}
public String getAuthor()
{
return this.author;
}
public String getBookName()
{
return this.bookName;
}
public int getBookPrice()
{
return this.bookPrice;
}
}
public class BookTest
{
public static void main(String[] args)
{
List<Book> list=new ArrayList<Book>();
list.add(new Book("张三","书名1",100));
list.add(new Book("李四","书名2",110));
list.add(new Book("王五","书名3",120));
String[][] child=new String[list.size()][3];
for(int i=0;i<child.length;i++)
{
for(int j=0;j<3;j++)
{
child[j][0]=list.get(j).getAuthor();
child[j][1]=list.get(j).getBookName();
child[j][2]=String.valueOf(list.get(j).getBookPrice());
}
}
for(String[] test:child)
for(String s:test)
System.out.print(s+" ");
}
}转的太别扭了,楼主凑活看!
Book book = books.get(i);
child[i][0] = book.getAuthor();
child[i][1] = book.getBookName();
child[i][2] = book.getBookPrice() + "";
}对的,主要就是这个for循环。