例题44（两个Lader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_4{
public static void main(String args[]){
 Lader.bottom=60;
 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());
}
}