public class JIhe {
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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;
}
}
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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;
}
}
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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;
}
}
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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();
}
}
我写了一个，内容比较简单的。代码如下：public class AnimalTest {
Animal animal;
public void eat(Animal animal){
animal.eat();
}
public void walk(Animal animal){
animal.walk();
}
public static void main(String args[]){
Animal animal=new Animal("animal");
Wolf w=new Wolf("wolf");
Goat g=new Goat("goat");
AnimalTest at=new AnimalTest();
at.eat(animal);
at.eat(w);
at.eat(g);
at.walk(animal);
at.walk(w);
at.walk(g);
}
}
class Animal {
String name;
public Animal(String name){
this.name=name;
}
public Animal(){}
public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}
public void eat(){
System.out.println("animal eat");
}
public void walk(){
System.out.println("animal walk");
}
public String toString(){
return name;
}
}class Wolf extends Animal {
public Wolf(String name){
super(name);
}
public Wolf(){}
public void eat(){
System.out.println("wolf eat meat");
}
public void walk(){
System.out.println("wolf walk");
}
public String toString(){
return name;
}
}class Goat extends Animal {
public Goat(String name){
super(name);
}
public Goat(){}
public void eat(){
System.out.println("goat eat grass");
}
public void walk(){
System.out.println("goat walk");
}
public String toString(){
return name;
}
}
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