java 用面向对象的思想计算三角形的周长和面积

用cmd命令行编译JAVA程序
D:>cd C:\Users\Administrator\workspace\demo\src\controllers //切换目录
D:>c:
C:\Users\Administrator\workspace\demo\src\controllers>

C:\Users\Administrator\workspace\demo\src>javac controllers/TestDemo.java //编译

C:\Users\Administrator\workspace\demo\src>
C:\Users\Administrator\workspace\demo\src>java controllers/TestDemo //运行
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package controllers;
/*
 本程序证明了：面向对象的思想算出三角形的周长和面积！！！
 */
class Test {

	int a;
	int b;
	int c;

	public int zhouchang() {
		return a + b + c;
	}

	public double area() {
		double p = 1.0 * (a + b + c) / 2;
		return Math.sqrt(p * (p - a) * (p - b) * (p - c));
	}

}

public class Triangle {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Test triangle = new Test();
		triangle.a = 3;
		triangle.b = 4;
		triangle.c = 5;
		System.out.println("周长++++" + triangle.zhouchang());

		System.out.println("面积++++" + triangle.area());
	}

}