4-15

java入门的几个代码,很实用,初学者不可错过

//文件：packone\ClassBeUsed. java
package  packone;
public class ClassBeUsed
{
private int counts;
//如果想使一个类能被在其他包中使用，那么其构造方法必须声明为public
public ClassBeUsed()
{
setcounts (0);
}
public ClassBeUsed (int i)
{
setcounts(i);
}
protected void setcounts(int i)
{
counts=i;
}
public int getcounts()
{
return counts;
}
}
//文件:packtwo\UsingClass. java
package packtwo;
public class UsingClass
{
public static void main(String[] args)
{
packone. ClassBeUsed  cb = new  packone. ClassBeUsed(2);
System.out.println(cb,get counts());
}
}