创建一个三角形类，成员变量三边，方法求周长，创建类主类A来测试它

package com.hanqi.test;

public class sanjiaoxing {

	 private double a;

	 private double b;

	 private double c;

	public double getA() {

		return a;

	}

	public void setA(double a) {

		this.a = a;

	}

	public double getB() {

		return b;

	}

	public void setB(double b) {

		this.b = b;

	}

	public double getC() {

		return c;

	}

	public void setC(double c) {

		this.c = c;

	}

public double getZhouchang()

	{

		return a+b+c;

	}

}

　　

package com.hanqi.test;

public class Test07 {

    public static void main(String[] args) {

        sanjiaoxing sjx=new sanjiaoxing();

        sjx.setA();

        sjx.setB();

        sjx.setC();

        System.out.println("三边分别是10,20,30的周长是："+sjx.getZhouchang());

    }

}