package a;
import java.nio.charset.MalformedInputException;
public class Sanjiaoxing {
private double a,b,c;
// public Sanjiaoxing(double a, double b, double c) {
// super();
// this.a = a;
// this.b = b;
// this.c = c;
// }
public void zhouchang(double a,double b,double c)
{
//Math.abs(a-b)取绝对值
if(a>0&&b>0&&c>0&&(a+b)>c&&Math.abs(a-b)<c)
{
System.out.println("周长为:"+(a+b+c));
}
else
{
System.out.println("参数错误");
}
}
public static void main(String[] args) {
Sanjiaoxing sanjiao=new Sanjiaoxing();
sanjiao.zhouchang(3, 4, 5);
}
}
![](https://images2015.cnblogs.com/blog/917851/201605/917851-20160520205544716-68294009.png)