实验简述：
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。
测试函数源代码：
public class test1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Triangle Triangle1 = new Triangle(3f, 4f, 5f),Triangle2 = new Triangle(6f, 7f, 8f);
System.out.println("Triangle1的边长1是："+Triangle1.get_length1());
System.out.println("Triangle1的边长2是："+Triangle1.get_length2());
System.out.println("Triangle1的边长3是："+Triangle1.get_length3());
System.out.println("计算Triangle1的周长是："+Triangle1.comgirth());
System.out.println("计算Triangle1的面积是："+Triangle1.comarea());
Triangle1.set_length1(4f);
float l = Triangle1.get_length1();
}
}
类的源码：
public class Triangle
{
float length1,length2,length3;//girth,area;
Triangle(float x,float y,float z)
{
length1 = x;
length2 = y;
length3 = z;
}
void set_length1(float length1)
{
this.length1 = length1;
}
void set_length2(float length2)
{
this.length2 = length2;
}
void set_length3(float length3)
{
this.length3 = length3;
}
float get_length1()
{
return this.length1;
}
float get_length2()
{
return this.length2;
}
float get_length3()
{
return this.length3;
}
double comarea()
{
float p;
double area;
p = (length1 + length2 + length3)/2.0f;
area = Math.sqrt(p*(p - length1)*(p - length2)*(p - length3));
return area;
}
float comgirth()
{
float girth;
girth = length1 + length2 + length3;
return girth;
}
}
