java程序代码实现矩形、三角形、圆的面积和周长计算

import java.util.*;
class Juxing1{
int length;
int wide;
Juxing1(int l,int w){
length=l;
wide=w;
}
int area(int l,int w){
return l*w;
}
int girth(int l,int w){
return 2*(l+w);
}
void printInfo(){
System.out.println("矩形的长为"+length+",宽为"+wide+",面积为"+length*wide+",周长为"+2*(length+wide));
}

}
 class Triangle{
double side1;
double side2;
double side3;
double a;
Triangle(double s1,double s2,double s3){
side1=s1;
side2=s2;
side3=s3;
}
double area(double s1,double s2,double s3){