同步课 / 2014级JavaSE

/**
 * 作业说明： 创建圆形、三角形、方形 三个形状类，具有高宽等属性和能够计算周长、面积的成员方法
 * 姓名：王晓旺
 * 学号：2014011739
 * 班级：5班
 */
//Shape.java
package com.works1.www;

public abstract class Shape {
	public abstract double getArea();

	public Shape() {
		// TODO Auto-generated constructor stub
	}
}
// Circle.java
package com.works1.www;

public class Circle extends Shape {
	private double r;
	final double pi = 3.14;

	public Circle(double r) {
		// TODO Auto-generated constructor stub
		if (r < 0) {
			System.out.println("圆的r不能为负数");
		} else {
			this.r = r;
		}
	}

	public double getPer() {
		double L;
		L = 2 * pi * r;
		return L;
	}

	public double getArea() {
		double S;
		S = pi * r * r;
		return S;
	}

}
// Triangle.java

package com.works1.www;

public class Triangle  extends Shape{
	private double a, b, c;

	public Triangle(double a, double b, double c) {
		// TODO Auto-generated constructor stub
		if (a < 0 || b < 0 || c < 0 || a + b <= c || a + c <= b || b + c <= a) {
			System.out.println("输入的数值不满足构成三角形的要求！");
		} else {
			this.a = a;
			this.b = b;
			this.c = c;
		}
	}

	public double getPer() {
		double L;
		L = a + b + c;
		return L;
	}

	public double getArea() {
		double p, s;
		p = (a + b + c) / 2;
		s = Math.sqrt(p * (p - a) * (p - b) * (p - c));
		return s;
	}

}
//Rectangle.java
package com.works1.www;

public class Rectangle extends Shape {
	private double a, b;

	public Rectangle(double a, double b) {
		// TODO Auto-generated constructor stub
		if (a < 0 || b < 0) {
			System.out.println("输入的条件不符合题意！");
		} else {
			this.a = a;
			this.b = b;
		}
	}

	public double getPer() {
		double L;
		L = (a + b) * 2;
		return L;
	}

	public double getArea() {
		double S;
		S = (a * b);
		return S;
	}
}
// Exp0103Test.java
package com.works1.www;

public class Exp0103Test{
	public static void main(String[] args) {
		// TODO Auto-generated constructor stub
		Circle X = new Circle(8);
		Triangle Y = new Triangle(3, 4, 5);
		Rectangle Z = new Rectangle(6, 7);
		System.out.println("圆的周长：" + X.getPer());
		System.out.println("圆的面积：" + X.getArea());
		System.out.println("三角形的周长：" + Y.getPer());
		System.out.println("三角形的面积：" + Y.getArea());
		System.out.println("方形的面积：" + Z.getPer());
		System.out.println("方形的面积：" + Z.getArea());
	}

}

/**
 * 作业说明： 创建圆形、三角形、方形 三个形状类，具有高宽等属性和能够计算周长、面积的成员方法
 * 姓名：王晓旺
 * 学号：2014011739
 * 班级：5班
 */
//Shape.java
package com.works1.www;

public abstract class Shape {
	public abstract double getArea();

	public Shape() {
		// TODO Auto-generated constructor stub
	}
}
// Circle.java
package com.works1.www;

public class Circle extends Shape {
	private double r;
	final double pi = 3.14;

	public Circle(double r) {
		// TODO Auto-generated constructor stub
		if (r < 0) {
			System.out.println("圆的r不能为负数");
		} else {
			this.r = r;
		}
	}

	public double getPer() {
		double L;
		L = 2 * pi * r;
		return L;
	}

	public double getArea() {
		double S;
		S = pi * r * r;
		return S;
	}

}
// Triangle.java

package com.works1.www;

public class Triangle  extends Shape{
	private double a, b, c;

	public Triangle(double a, double b, double c) {
		// TODO Auto-generated constructor stub
		if (a < 0 || b < 0 || c < 0 || a + b <= c || a + c <= b || b + c <= a) {
			System.out.println("输入的数值不满足构成三角形的要求！");
		} else {
			this.a = a;
			this.b = b;
			this.c = c;
		}
	}

	public double getPer() {
		double L;
		L = a + b + c;
		return L;
	}

	public double getArea() {
		double p, s;
		p = (a + b + c) / 2;
		s = Math.sqrt(p * (p - a) * (p - b) * (p - c));
		return s;
	}

}
//Rectangle.java
package com.works1.www;

public class Rectangle extends Shape {
	private double a, b;

	public Rectangle(double a, double b) {
		// TODO Auto-generated constructor stub
		if (a < 0 || b < 0) {
			System.out.println("输入的条件不符合题意！");
		} else {
			this.a = a;
			this.b = b;
		}
	}

	public double getPer() {
		double L;
		L = (a + b) * 2;
		return L;
	}

	public double getArea() {
		double S;
		S = (a * b);
		return S;
	}
}
// Exp0103Test.java
package com.works1.www;

public class Exp0103Test{
	public static void main(String[] args) {
		// TODO Auto-generated constructor stub
		Circle X = new Circle(8);
		Triangle Y = new Triangle(3, 4, 5);
		Rectangle Z = new Rectangle(6, 7);
		System.out.println("圆的周长：" + X.getPer());
		System.out.println("圆的面积：" + X.getArea());
		System.out.println("三角形的周长：" + Y.getPer());
		System.out.println("三角形的面积：" + Y.getArea());
		System.out.println("方形的面积：" + Z.getPer());
		System.out.println("方形的面积：" + Z.getArea());
	}

}