例子4.4

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());
 }
}