Jajar genjang

import java.io.*;

public class jajargenjang {

public static void main(String[] args) {

                     

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

          

     String stralas = null;    

     String strtinggi = null;

     String strsisimiring = null;

          

try {

System.out.println("Rumus L jajargenjang = alas x tinggi");

System.out.println("Rumus KLL jajargenjang = 2*alas + 2*sisimiring");

System.out.print("Masukan Alas : ");

stralas=br.readLine();

System.out.print("Masukan tinggi : ");

strtinggi=br.readLine();

System.out.print("Masukan sisimiring : ");

strsisimiring=br.readLine();

                    

     }catch (IOException ioe) {

     System.out.println(" Keslahan pada sistem IO");

     System.exit(0);

     }   

double alas;

double tinggi;

double sisimiring;

double luas;

double kll;

               

alas=Double.parseDouble(stralas);

tinggi=Double.parseDouble(strtinggi);

sisimiring=Double.parseDouble(strsisimiring);  

               

luas = alas * tinggi ;

System.out.println ("Luas jajargenjang " + luas );

               

kll = ((2*alas)+(2*sisimiring));

System.out.println ("Keliling persegi " + kll );          

               

     }

}