4-15.txt

这本书里面有许多基础的知识

//文件:packone\Class Be Used. java
package packone;  //定义了包packone
public class ClassBeUsed
{
private int counts;
ClassBeUsed()
{
setcounts(0);
}
ClassBeUsed(int i)
{
setcounts(i);
}
protected void setcounts(int i)
{
counts=i;
}
public int getcounts()
{
return counts;
}
}
//文件：packtwo\UsingClass. java
package packtwo;           //定义了包packtwo
public class UsingClass
{
public static void main(String[]args)
{
ClassBeUsed cb = new ClassBeUsed(2);
System.out.println(cb. get counts());
}
}