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1.设计图形（Shape）类及其⼦类（Circle、Rectangle、
Triangle）。。。
Point:
public class Point {
private int x;
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public int getX() {
return x;
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}
public void tX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void tY(int y) {
this.y = y;
}
public Point() {
super();
}
}
Shape:
public class Shape {
private Point p;
private String color;
public double calcArea() {
return 0;
}
public double calcPerimeter() {
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return 0;
}
public Shape() {
super();
}
public Point getP() {
return p;
}
public void tP(Point p) {
this.p = p;
}
public String getColor() {
return color;
}
public void tColor(String color) {
}
}
Circle :
public class Circle extends Shape { private int radius;
public Circle() {
super();
}
public Circle(int radius) {
super();
this.radius = radius;
}
public double calcArea() {
return Math.PI * radius * radius; }
public double calcPerimeter() {
return 2 * Math.PI * radius;
}
public int getR() {
return radius;
}
public void tR(int r) {
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this.radius = r;
}
}
Rectangle：
private int width;
public Rectangle() {
super();
}
public Rectangle(int length, int width) { super();
this.length = length;
this.width = width;
}
public double calcArea() {
return length * width;
}
public double calcPerimeter() {
return 2 *( length + width);
}
public int getLength() {
return length;
}
public void tLength(int length) {
this.length = length;
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public int getWidth() {
return width;
}
in additionpublic void tWidth(int width) {
this.width = width;
}
}
Triangle：
private int height;
public Triangle() {
super();
}冲账
public Triangle(int length, int height) {
super();
this.length = length;
this.height = height;
}
public double calcArea() {alexandra stan
return (length * height)/2;
}
public double calcPerimeter() {
return length +2 *Math.sqrt(((length/2)*(length/2))+(height* height)); }
public int getLength() {
return length;
}
public void tLength(int length) {意大利英文
this.length = length;
}
public int getHeight() {
return height;
}
public void tHeight(int height) {
this.height = height;
}
}
测试：Test
public class Testlianxi1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Shape s = new Shape();
Circle c = new Circle(5);
System.out.println("圆的⾯积为：" +c.calcArea());
System.out.println("圆的周长为：" +c.calcPerimeter());
Rectangle r = new Rectangle(5, 6);
System.out.println("矩形的⾯积为：" +r.calcArea());
System.out.println("矩形的周长为：" +r.calcPerimeter());
Triangle t = new Triangle(6, 4);
System.out.println("等腰三⾓形的⾯积为：" +t.calcArea());
System.out.println("等腰三⾓形的周长为：" +t.calcPerimeter()); }
}
