成员变量的简单例题

用两个对象共享bottom

class Lader{

double above,height;

static double bottom;

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 mian(String args[]){

Lader.bottom=60;

Lader laderOne,laderTwo;

System.out.println("现在对所有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());

}

}