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1、Java MyShape抽象類（面向?qū)ο螅?
運行成果：（參照代碼一）
1.MyCircle 類
public class MyCircle extends Shape{
private float radius;
public MyCircle(int width, int height) {
super(width, height);
radius=width/2;
this.x=3;
this.y=45;
// TODO Auto-generated constructor stub
}
@Override
public
2、 float getArea() {
// TODO Auto-generated method stub
return (float) (Math.PI*radius*radius);
}
@Override
public float getGirth() {
// TODO Auto-generated method stub
return (float) (Math.PI*2*radius);
}
public String toString(){
return "這是圓，周長是："+getGirth()+" 面積是："+getG
3、irth();
}
}
2，MyEllipse類
public class MyEllipse extends Shape{
public MyEllipse(int width, int height) {
super(width, height);
this.x=3;
this.y=85;
// TODO Auto-generated constructor stub
}
@Override
public float getArea() {
// TODO Auto-generated method stub
retu
4、rn (float) (Math.PI *(width+height)/4*(width+height)/4);
}
@Override
public float getGirth() {
// TODO Auto-generated method stub
return (float) ((float)2*Math.PI*(width+height)/2);
}
public String toString(){
return "這是一種橢圓，周長是："+getGirth()+" 面積是："+getGirth();
}
}
3 MyRec
5、tangle類
public class MyRectangle extends Shape{
public MyRectangle(int width, int height) {
super(width, height);
this.x=3;
this.y=5;
// TODO Auto-generated constructor stub
}
@Override
public float getArea() {
// TODO Auto-generated method stub
return width*height;
}
6、
@Override
public float getGirth() {
// TODO Auto-generated method stub
return 2*width*height;
}
public String toString(){
return "這是矩形，周長是："+getGirth()+" 面積是："+getGirth();
}
}
4.MyTriangle類
public class MyTriangle extends Shape{
public MyTriangle(int width, int height)
7、 {
super(width, height);
this.x=3;
this.y=125;
// TODO Auto-generated constructor stub
}
@Override
public float getArea() {
// TODO Auto-generated method stub
return (float) (width+height+Math.sqrt(width*width+height*height));
}
@Override
public float getGirth() {
8、 // TODO Auto-generated method stub
return width*height*1/2;
}
public String toString(){
return "這個是三角形，周長是："+getGirth()+" 面積是："+getGirth();
}
}
5 Shape抽象類
public abstract class Shape {
public int width;
public int height;
public int x;
public int y;
public Shape(int w
9、idth, int height){
this.width=width;
this.height=height;
}
public abstract float getArea();
public abstract float getGirth();
}
6.Test類
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test extends JPanel{
private Shape circle;
10、private Shape ellipse;
private Shape triangle;
private Shape rectangle;
public Test(){
JFrame f=new JFrame("形狀家族");
circle=new MyCircle(10,10);
ellipse=new MyEllipse(10,10);
triangle=new MyTriangle(10,10);
rectangle=new MyRectangle(10,10);
f.setVisible(true);
f.add(this);
11、
f.setSize(600,600);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new Test();
}
@Override
protected void paintComponent(Graphics g){
int[] xPoints=new int[]{tria
12、ngle.x,triangle.x+20,triangle.x};
int[] yPoints=new int[]{triangle.y,triangle.y,triangle.y-20};
g.drawOval(circle.x, circle.y, circle.width, circle.height);
g.drawString(circle.toString(), circle.x+25, circle.y+9);
g.drawOval(ellipse.x,ellipse.y, ellipse.width, ellipse.height);
g.
13、drawString(ellipse.toString(), ellipse.x+25, ellipse.y+9);
g.drawPolygon(xPoints, yPoints, 3);
g.drawString(triangle.toString(), triangle.x+25, triangle.y+9);
g.drawRect(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
g.drawString(rectangle.toString(), rectangle.x+25, recta
14、ngle.y+9);
}
}
效果：（參照代碼二）
1. 源代碼：
1.1 Myshape
package course.java.shape;
public abstract class MyShape {
public abstract float area();
public abstract float perimeter();
public abstract void display();
}
1.2 MyRectangle
package course.java.shape;
p
15、ublic class MyRectangle extends MyShape{
private float width,height;
public MyRectangle(float width, float height) {
super();
this.width = width;
this.height = height;
}
public float area(){
return width*height;
}
public float perimeter(){
return
16、2*(width+height);
}
public void display(){
System.out.println("矩形");
System.out.println("長：" + width + ", 寬：" + height);
}
}
1.3 MyCircle
package course.java.shape;
public class MyCircle extends MyShape{
private final float PI=3.14f;
private float radius;
17、 public MyCircle(float radius) {
super();
this.radius = radius;
}
public float area(){
return PI*radius*radius;
}
public float perimeter(){
return 2*PI*radius;
}
public void display(){
System.out.println("圓形");
System.out.println("半徑：
18、" +radius);
}
}
1.4 MyEllipse
package course.java.shape;
public class MyEllipse extends MyShape{
private final float PI=3.14f;
private float aLong,bShort;
public MyEllipse(float a, float b) {
super();
this.aLong = a;
this.bShort = b;
}
public float area(){
19、 return 1.0f/4*PI*aLong*bShort;
}
public float perimeter(){
return PI*bShort+2*(aLong-bShort);
}
public void display(){
System.out.println("橢圓形");
System.out.println("長軸長：" + aLong + ", 短軸長：" + bShort);
}
}
1.5 MyTriangle
package course.java
20、.shape;
public class MyTriangle extends MyShape{
private float a,b,c;
public MyTriangle(float a, float b, float c) {
super();
this.a = a;
this.b = b;
this.c = c;
}
public float area(){
float p=(a+b+c)/2;
return (float)Math.sqrt(p*(p-a)*(p-b)*(p-c));
21、 }
public float perimeter(){
return a+b+c;
}
public void display(){
System.out.println("三角形");
System.out.println("邊長：" + a + ", " + b + ", " + c);
}
}
1.6 Test測試程序
package course.java.shape;
import java.awt.Color;
import java.awt.Graphics;
22、
import javax.swing.JFrame;
public class Test extends JFrame{
public Test(){
super("繪圖演示");
setSize(480,300);
setVisible(true);
}
public void paint(Graphics g){
super.paint(g);
g.setColor(Color.red);
g.drawRect(50,50,6
23、0,40);
g.setColor(Color.blue);
g.drawOval(150,50,70,40);
g.setColor(Color.black);
g.drawOval(250,100,60, 60);
g.setColor(Color.green);
int xValues[]={100,150,200};
int yValues[]={200,180,240};
g.drawPolygon(xValues, yVal
24、ues, 3);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
MyShape mc,mr,mt,me;
mc=new MyCircle(3);
mc.display();
System.out.println("圓形旳面積為："+mc.area());
System.out.println("圓形旳周長為："+mc.perimeter());
mr=new MyRectan
25、gle(4,8);
mr.display();
System.out.println("矩形旳面積為："+mr.area());
System.out.println("矩形旳周長為："+mr.perimeter());
mt=new MyTriangle(3,4,5);
mt.display();
System.out.println("三角形旳面積為："+mt.area());
System.out.println("三角形旳周長為："+mt.perimeter()
26、);
me=new MyEllipse(2,4);
me.display();
System.out.println("橢圓形旳面積為："+me.area());
System.out.println("橢圓形旳周長為："+me.perimeter());
JFrame.setDefaultLookAndFeelDecorated(true);
Test application=new Test();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
UML圖：
