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第一个:
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public class Yaojing {
protected String name;
protected int age;
protected String gender;
public void showBasicInfo() {
System.out.println(toString());
}
public void eatTangSeng() {
System.out.println("吃饱了");
}
@Override
public String toString() {
return "Yaojing [name=" + name + ", age=" + age + ", gender=" + gender + "]";
}
}
第二个类
public class Zhizhujing extends Yaojing {
public void buildNet(){
System.out.println("蜘蛛在织网");
}
}
第三个类
public class Baigujing extends Yaojing {
public void beBeauty(){
System.out.println("白骨精");
}
}
简单写了下，希望对你有帮助
建议你找一下Java转型方面的资料
class Vehicle{
protected void vehicleRun(){
System.out.println("vehicle!!!");
}
}
class Truck extends Vehicle{
//子类覆写父类“vehicleRun方法”
protected void vehicleRun(){
System.out.println("It's Truck!!!");
}
protected void truckRun(){
System.out.println("truck!!!");
}
}
class Test{
public static void main(String [] args){
Vehicle v = new Vehicle();
v.vehicleRun(); //父类方法
//向上转型
Vehicle v1 = new Truck();
v1.vehicleRun(); //子类覆写后方法
//向下转型
Truck t = (Truck)v1;
t.vehicleRun();
t.truckRun();
}
}
代码如下：
abstract class DongWu {
public abstract void info();
}
class Bird extends DongWu {
@Override
public void info() {
System.out.println("我是一只鸟。");
}
}
class Fish extends DongWu {
@Override
public void info() {
System.out.println("我是一条鱼。");
}
}
public class App5 {
public static void main(String[] args) {
DongWu bird = new Bird();
bird.info();
DongWu fish = new Fish();
fish.info();
}
}
Java代码：
class Point {
protected int x;
protected int y;
public Point(int x, int y) {
this.x = x;
this.y = y;
}
}
class Circle extends Point {
protected int radius;
public Circle(int x, int y, int radius) {
super(x, y);
this.radius = radius;
}
public double area() {
return Math.PI * radius * radius;
}
public double perimeter() {
return 2 * Math.PI * radius;
}
}
class Cylindar extends Circle {
protected int height;
public Cylindar(int x, int y, int radius, int height) {
super(x, y, radius);
this.height = height;
}
public double volumn() {
return area() * height;
}
}
public class Main {
public static void main(String[] args) {
Point p1 = new Point(3, 4);
Point p2 = new Point(5, 6);
Circle c1 = new Circle(0, 0, 3);
Cylindar cy1 = new Cylindar(0, 0, 3, 4);
System.out.println("圆c1的面积：" + c1.area());
System.out.println("圆c1的周长：" + c1.perimeter());
System.out.println("圆柱体cy1的体积：" + cy1.perimeter());
}
}
运行测试：
圆c1的面积：28.274333882308138
圆c1的周长：18.84955592153876
圆柱体cy1的体积：18.84955592153876
public class JIhe {
private String color;
private String dateCreated;
private String filled;
public String getColor() {
return color;
}
public String getDateCreated() {
return dateCreated;
}
public String getFilled() {
return filled;
}
public void setColor(String color) {
this.color = color;
}
public void setFilled(String filled) {
this.filled = filled;
}
@Override
public String toString() {
return "Color:" + this.color +" filled:" + this.filled + "detaCreated:" + dateCreated;
}
}
------------------------------------------------------------------------------------------------------------
public class Circle extends JIhe {
private double radius;
public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
public double getArea() {
return 3.14 * this.radius * this.radius;
}
public double getPerimeter() {
return 2 * 3.14 * this.radius;
}
public double getDiameter() {
return 2 * this.radius;
}
}
-----------------------------------------------------------------------------------------------------
public class Rectangle extends JIhe {
private double width;
private double height;
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public double getArea(){
return this.width * this.height;
}
public double getPerimeter(){
return this.width * 2 + this.height * 2;
}
}
——————————————————————————————————————
public class Test {
public static void main(String[] args){
Circle circle = new Circle();
circle.setRadius(1.0);
System.out.println(circle.getArea());
System.out.println(circle.getColor());
System.out.println(circle.getDateCreated());
System.out.println(circle.getDiameter());
System.out.println(circle.getFilled());
System.out.println(circle.getPerimeter());
System.out.println(circle.getRadius());
Rectangle r = new Rectangle();
r.setHeight(2.0);
r.setWidth(4.0);
System.out.println(r.getArea());
System.out.println(r.getColor());
System.out.println(r.getDateCreated());
System.out.println(r.getFilled());
System.out.println(r.getHeight());
System.out.println(r.getPerimeter());
System.out.println(r.getWidth());
}
}
可运行的：
import java.awt.*;
import java.awt.event.*;
public class BackJFrame extends Frame{
public BackJFrame(){
super("台球");
setSize(300,300);
setBackground(Color.cyan); //背景
setVisible(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing (WindowEvent e)
{System.exit(0);}
} );
}
public static void main(String args[]){
new BackJFrame();
}
}