求大神指点01

package com.collection;

public class Book {
public String id;
public String name;

public void Book(String id,String name) {
this.id = id;
this.name = name;
}
}

package com.collection;
import java.util.ArrayList;
import java.util.List;

public class ListTest {
public List BookToSelect;

public ListTest(){
this.BookToSelect=new ArrayList();
}

public void BookAdd(){
Book bt=new Book("1.","《三国演义》");//此处编译器报错
BookToSelect.add(bt);
Book temp=(Book) BookToSelect.get(0);
System.out.println("添加了第一本书："+bt.id+bt.name);
}

public static void main(Sring[] args){
ListTest lt=new ListTest();
lt.BookAdd();
}
}

如果把Book类中的属性设置为private，那么在Book中应该怎么去添加书呢？

moummm

2017-02-14

源自：Java入门第三季 4-4

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4 回答

moummm 提问者
2017-02-17

public class ListTest {
public List BookToSelect;

public ListTest(){
this.BookToSelect=new ArrayList();
}

public void BookAdd(){
Book bt0=new Book("1.","《三国演义》");
BookToSelect.add(bt0);
Book temp0=(Book) BookToSelect.get(0);
System.out.println("添加了第一本书："+temp0.getId()+temp0.getName());

Book bt1=new Book("2.","《水浒传》");
BookToSelect.add(0,bt1);
Book temp1 = (Book)BookToSelect.get(0);
System.out.println("添加第二本书："+temp1.getId()+temp1.getName());
}

public static void main(Sring[] args){
ListTest lt=new ListTest();
lt.BookAdd();
}
}