例4-2.txt

这是一本java基础教程 对新手上路有很大帮助

class Lader{
  double above,height;    //实例变量
    static double bottom;   //类变量
    void setAbove(double a){
       above=a;
    }
    void setBottom(double b){
       bottom=b;
    }
    double getAbove(){
       return above;
    }
    double getBottom(){
       return bottom;
    }
}
class Example4_2{
    public static void main(String args[]){
       Lader.bottom=60;    //Lader的字节码被加载到内存，通过类名操作类变量
       Lader laderOne,laderTwo;
       System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);    
       laderOne=new Lader();  
       laderTwo=new Lader();
       System.out.println("laderOne的bottom:"+laderOne.getBottom());
       System.out.println("laderTwo的bottom:"+laderTwo.getBottom());
       laderOne.setAbove(11);
       laderTwo.setAbove(22);
       laderTwo.setBottom(100);
       System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);
       System.out.println("laderOne的above:"+laderOne.getAbove());
       System.out.println("laderTwo的above:"+laderTwo.getAbove());
    } 
}