抽象类

1、抽象类

public abstract class Student{  public abstract void PrepareEx();  public abstract void PrepareEx2();  public abstract void PrepareEx3();  public  void PrepareEx4(){}  }    public class StudentA  extends Student{@Overridepublic void PrepareEx() {// TODO Auto-generated method stub}@Overridepublic void PrepareEx2() {// TODO Auto-generated method stub}@Overridepublic void PrepareEx3() {// TODO Auto-generated method stub}    }

当抽象类被继承的时候，会要全部实现他的抽象方法相当于实现一个接口要实现里面的全部方法。