Program Sederhana menghitung luas Trapesium dengan Menggunakan Java

import javax.swing.*;
/**
*
* @author Dibya Nanda P
*/
public class LuasTrapesium {
public static void main(String[] args) {
JOptionPane.showMessageDialog(null,"Program untuk menghitung luas trapesium","DIBYA",

JOptionPane.WARNING_MESSAGE);
String rusuk1 = JOptionPane.showInputDialog(null,"Masukkan panjang rusuk atasnya : ");
int ru1=Integer.parseInt(rusuk1);
String rusuk2 = "";
rusuk2 = JOptionPane.showInputDialog(null,"Masukkan panjang rusuk bawahnya : ");
int ru2=Integer.parseInt(rusuk2);
String tinggi = "";
tinggi = JOptionPane.showInputDialog(null,"Masukkan tingginya : ");
int t=Integer.parseInt(tinggi);
int l1=((ru2-ru1)/2)*t/2;
int l2=ru1*t;
int s=(((ru2-ru1)/2)*((ru2-ru1)/2))+(t*t);
double m=Math.sqrt(s);
JOptionPane.showMessageDialog(null,"Panjang rusuk atasnya = "+(ru1));
JOptionPane.showMessageDialog(null,"Panjang rusuk bawahnya = "+(ru2));
JOptionPane.showMessageDialog(null,"Tingginya = "+(t));
JOptionPane.showMessageDialog(null,"Luasnya = "+((l1*2)+l2));
JOptionPane.showMessageDialog(null,"Kelilingnya = "+((ru1+ru2)+(m*2)));
}
}