小编Arv*_*ria的帖子

CSS

 * {
     margin: 0px;
     padding: 0px;
 }
 html {
     margin: 0px;
     padding: 0px;
 }
 body {
     line-height: 1;
     margin: 0px;
     padding:0px;
     background:url("../images/22.jpg") scroll center top #16202C;
     /*  box-shadow: 0 0 225px rgba(0, 0, 0, 0.45) inset;
    -webkit-box-shadow: 0 0 225px rgba(0, 0, 0, 0.45) inset;
    -moz-box-shadow:  0 0 225px rgba(0, 0, 0, 0.45) inset;
-o-box-shadow:  0 0 225px rgba(0, 0, 0, 0.45) inset; */
     color: #464646;
     font: 13px/17px arial, sans-serif;
     min-width: 1300px;
 }
 #wrapper {
     margin: 0px;
 }
 #header …

public class A{ 
    int x=20;
    public int getX(){
     return x;
    }
    public void setX(int x){
     this.x=x;
    }
}

public class B extends A{
    int x=10;
   public void setX(int x){
       this.x=x;
     } 
    public static void main(String[] args) {
       B a=new B(); or A a= new B();
       a.setX(30);
       System.out.println(a.getX());/*it will always print parent class X*/
    }
}