关于子父类继承之后成员变量的问题
class Fu
{
int x=100;
void f()
{
System.out.println(x*x);
}
}
class Zi_1 extends Fu
{
int x=2;
}
class Zi_2 extends Fu
{
int x=8;
}
class Demo
{
public static void main(String[] args)
{
Zi_1 z1=new Zi_1();
z1.f();
Zi_2 z2=new Zi_2();
z2.f();
}
}
我想的是用子类继承了父类里的f()方法 然后用子类里自己的x的值进行运算 但是最好不要重写父类的方法 ,因为子类既然继承了父类的,所以应该子类本身也有了f()方法的,该如何实现呢??我知道这种情况很少见,但我还是想知道该如何实现。。。
[解决办法]
public class F {
int x =1;
void print(){
System.out.println(x );
}
public F(int x) {
this.x = x;
}
}
//
public class Z extends F{
public Z(int x) {
super(x);
}
int y;
}
//
import static org.junit.Assert.*;
import org.junit.Test;
public class ZTest {
@Test
public void test() {
Z z = new Z(0);
z.print();
}
[解决办法]
public Zi_1(){
super.x = this.x;
}
[解决办法]
1楼、2楼的方法都能实现,顶。我认为2楼的更适合:
class Zi_1 extends Fu {
int x = 2;
Zi_1(){
super.x=this.x;
}
}
class Zi_2 extends Fu {
int x = 8;
Zi_2(){
super.x=this.x;
}
}
class Demo {
public static void main(String[] args) {
Zi_1 z1 = new Zi_1();
z1.f();
Zi_2 z2 = new Zi_2();
z2.f();
}
}
[解决办法]
不能通过?你确定你没开玩笑?
public class Test { public static void main(String[] args) { Zi_1 z1=new Zi_1(); z1.f(); Zi_2 z2=new Zi_2(); z2.f(); }}class Fu { int x = 100; void f() { System.out.println(this.x * this.x); }}class Zi_1 extends Fu { public Zi_1(){ super.x = this.x; } int x = 2;}class Zi_2 extends Fu { public Zi_2(){ super.x = this.x; } int x = 8;}//运行结果//4//64