Java的开始

1.封装一类三角形对象Triangle，该类对象具有三条边的属性，具有初始化三角形的功能、修改边长的功能、判断三条边能否构成三角形的功能、求周长的功能、求面积的功能。

源程序：

 

package g;

public class Triangle {

	/**
	 * @param args
	 */
	private int F_side,S_side,T_side;
	public Triangle(){}
	public void set_F_side(int F_side){
		this.F_side = F_side;
	}
	public void set_S_side(int S_side){
		this.S_side = S_side;
	}
	public void set_T_side(int T_side){
		this.T_side = T_side;
	}
	public boolean Is_Triangle(int F_side, int S_side, int T_side){
		if((F_side+S_side > T_side) &&(F_side+T_side > S_side)&&( S_side+T_side >F_side))
			return true;
		return false;
	}
	public int Perimeter(){
		return (this.F_side+this.S_side+this.T_side);
	}
	public double Area(){
		int p = (this.F_side+this.S_side+this.T_side)/2;
		double q = p * (p-this.F_side) *(p-this.S_side) *(p-this.T_side);
		
		return 	Math.sqrt(q);
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Triangle tri = new Triangle();
		tri.set_F_side(3);
		tri.set_S_side(4);
		tri.set_T_side(5);
		if(tri.Is_Triangle(tri.F_side, tri.S_side, tri.T_side)){
			System.out.println("这三条边可以组成三角形");
		}
		else
		{
			System.out.println("这三条边不能组成三角形");
		}
		System.out.println("三角形的周长为：" + tri.Perimeter());
		System.out.println("三角形的面积为：" + tri.Area());

	}

}

是时候该开始学点Java了，开学到现在都没好好学。。。。