我现在在学JAVA基础,看完基础内容的一半了,有一些疑问,是关于包和接口的内容的.问题: 书上说在包与包之间怎么互相引用?(比如我定义一个MyPack的包,书上说为了使程序找到MyPack,程序在的紧邻的上层目录执行,我先在包外面编译了一个文件,然后把源文件与.class文件都放进了MyPack文件夹中,再用java命令执行时出错了)源程序如下:
package MyPack;
import BookPack.*;class UseBook{
public static void main(String args[])
{
Book books[] = new Book[5];
books[0]=new Book("Java Beginners Guide","Schildt",2001);
books[1]=new Book("java2 programmers Reference","Schildt",2000);
books[2]=new Book("HTML Programmers Reference","Powelll and Whitworth",1998);
books[3]=new Book("Red Storm Rising","Clancy",1986);
books[4]=new Book("On the Road","Kerouac",1955); for(int i=0; i<books.length;i++) books[i].Show();
}
}
这是一个包中的程序文件.BookPack包中的内容如下:package BookPack;class Book{
private String title;
private String author;
private int pubDate;public Book(String t,String a,int d)
{
title=t;
author=a;
pubDate=d;
}public void Show()
{
System.out.println(title);
System.out.println(author);
System.out.println(pubDate);
System.out.println();
}
}关键问题是不知道怎么编译和执行.如果哪位仁兄能给些帮助,本人不胜感激.
package MyPack;
import BookPack.*;class UseBook{
public static void main(String args[])
{
Book books[] = new Book[5];
books[0]=new Book("Java Beginners Guide","Schildt",2001);
books[1]=new Book("java2 programmers Reference","Schildt",2000);
books[2]=new Book("HTML Programmers Reference","Powelll and Whitworth",1998);
books[3]=new Book("Red Storm Rising","Clancy",1986);
books[4]=new Book("On the Road","Kerouac",1955); for(int i=0; i<books.length;i++) books[i].Show();
}
}
这是一个包中的程序文件.BookPack包中的内容如下:package BookPack;class Book{
private String title;
private String author;
private int pubDate;public Book(String t,String a,int d)
{
title=t;
author=a;
pubDate=d;
}public void Show()
{
System.out.println(title);
System.out.println(author);
System.out.println(pubDate);
System.out.println();
}
}关键问题是不知道怎么编译和执行.如果哪位仁兄能给些帮助,本人不胜感激.
解决方案 »
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java MyPack.UseBook
运行java UseBook时,错误提示如下:C:\java2\BookPackB>javac UseBook.java
UseBook.java:2: package BookPack does not exist
import BookPack.*;
^
UseBook.java:7: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
Book books[] = new Book[5];
^
UseBook.java:7: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
Book books[] = new Book[5];
^
UseBook.java:8: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
books[0]=new Book("Java Beginners Guide","Schildt",2001);
^
UseBook.java:9: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
books[1]=new Book("java2 programmers Reference","Schildt",2000);
^
UseBook.java:10: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
books[2]=new Book("HTML Programmers Reference","Powelll and Whitworth",1998);
^
UseBook.java:11: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
books[3]=new Book("Red Storm Rising","Clancy",1986);
^
UseBook.java:12: cannot resolve symbol
symbol : class Book
location: class BookPackB.UseBook
books[4]=new Book("On the Road","Kerouac",1955);
^
8 errors说不存在BookPack包,而BookPack包和BookPackB包我是放在同一级目录下,不知道错误在哪,
盼回复.
import com.aegon_cnooc.report.util.ReportConstants;
这里的路径是这样的project souce\com\aegon_cnooc.report\util
你不能这样编译。因为你BookPack包里面的东西没有编译好。
就行
用Eclipse那些事不用你管
2.你应该首先编译BookPack包下的Book.java文件,得到一个Book.class(假设当前目录是c:\)
3.将该.class文件放到.\BookPack\下去
4.在当前目录下编译UseBook类
5.将编译完成的UseBook.class类放入.\MyPack\目录下
6.在c:\下使用java MyPack.UseBook运行