package com.hanqi.test;

public class Triangle {

private double a,b,c;

public Triangle(double d,double f,double g)

{

	if(d+f>g&d+g>f&f+g>d)

	{

		a=d;

	    b=f;

	    c=g;

	}

	else

	{

		System.out.println("不能构成三角形");

	}

}

public void zhouChang()

{

	if (a!=0)

	{

		System.out.println(a+b+c);

	}

}

}

//主类

package com.hanqi.test;

public class A {

public static void main(String[] args) {

	Triangle a=new Triangle(1,2,3);

	a.zhouChang();

	a=new Triangle(5,7,9);

	a.zhouChang();

}

}

//运行结果

不能构成三角形

21.0