java 抽象X的 学习

public class now {

public int a=2;

public int b=2;

public final int[] arr={1,2,3,4};

int[] ss=arr;

public final int c=3;

public void oo(){

System.out.println("asddas");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

fff k=new fff();

}

}

abstract class dd{

int a=1;

int b=2;

public void c(){

System.out.println("child");

}

public abstract void d(int a,int b);//普通函数但是没有方法体

public dd(){};//可以有构造函数

}

class fff extends dd{

@Override

public void d(int a, int b) {

// TODO Auto-generated method stub

System.out.println("继承抽象类1");

}

public fff(){

System.out.println("kaishi");

}

}

class ffff extends dd{

@Override

public void d(int a, int b) {

// TODO Auto-generated method stub

System.out.println("继承抽象类2");

}

}