Calculadora

package operaciones;
@ author Alejandro Puerto León
class Operar {

    public int suma(int a, int b){
        int resultado=a+b;
        return resultado;
    }
    
    public int resta(int a, int b){
        int resultado=a-b;
        return resultado;
    }
    
    public int multiplicacion(int a, int b){
        int c=a*b;
        return c;
    }
    
    public Double division(Double a, Double b){
        Double c=a/b;
        return c;
    }
    
    public Double raiz(Double a){
        Double b=Math.sqrt(a);
        return b;
    }
    
    public Double potencia(Double a, Double b){
        Double c=Math.pow(a, b);
        return c;
    }
    
    
    
}

package gui;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JTextField;

import operaciones.Operar;
 @ author Alejandro Puerto León
class Pantalla extends JDialog implements ActionListener{

    JButton b0;
    JButton b1;
    JButton b2;
    JButton b3;
    JButton b4;
    JButton b5;
    JButton b6;
    JButton b7;
    JButton b8;
    JButton b9;
    JButton bsuma;
    JButton bresta;
    JButton bmulti;
    JButton bdiv;
    JButton braiz;
    JButton bpot;
    JButton bigual;
    JButton bclear;
    
    JTextField jtf1;
    
    JPanel p1;
    JPanel p2;
    static JPanel p3;
    static JPanel p4;
    
    public String opcion;
    public String suma1;
    int opcion2=0;
    Operar op=new Operar();
    
    
    public static void main(String[] args) {

        Pantalla calc = new Pantalla();
        calc.setTitle("Calculdora");
        calc.setSize(290, 190);
        calc.setLocation(350, 200);
        p4.add(p3);
        calc.add(p4);
        calc.setVisible(true);

    }

    Pantalla() {
        b0 = new JButton("0");
        b1 = new JButton("1");
        b2 = new JButton("2");
        b3 = new JButton("3");
        b4 = new JButton("4");
        b5 = new JButton("5");
        b6 = new JButton("6");
        b7 = new JButton("7");
        b8 = new JButton("8");
        b9 = new JButton("9");
        bsuma = new JButton("+");
        bresta = new JButton("-");
        bmulti = new JButton("*");
        bdiv = new JButton("/");
        braiz = new JButton("SQRT");
        bpot = new JButton("^");
        bigual = new JButton("===");
        bclear = new JButton("Clear"); 
        
        jtf1 = new JTextField(10);
        
        p1 = new JPanel();
        p2 = new JPanel();
        p3 = new JPanel();
        p4 = new JPanel();

        p1.add(bigual);
        p1.add(jtf1);
        p1.add(bclear);
        p2.setLayout(new GridLayout(4, 4, 2, 2));
        p2.add(bsuma);
        p2.add(b1);
        p2.add(b2);
        p2.add(b3);
        p2.add(bresta);
        p2.add(b4);
        p2.add(b5);
        p2.add(b6);
        p2.add(bmulti);
        p2.add(b7);
        p2.add(b8);
        p2.add(b9);
        p2.add(bdiv);
        p2.add(braiz);
        p2.add(bpot);
        p2.add(b0);

        p3.setLayout(new BorderLayout());
        p3.add(p1, BorderLayout.NORTH);
        p3.add(p2, BorderLayout.CENTER);

        b0.addActionListener(this);
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
        b6.addActionListener(this);
        b7.addActionListener(this);
        b8.addActionListener(this);
        b9.addActionListener(this);
        bsuma.addActionListener(this);
        bresta.addActionListener(this);
        bmulti.addActionListener(this);
        bdiv.addActionListener(this);
        braiz.addActionListener(this);
        bpot.addActionListener(this);
        bigual.addActionListener(this);
        bclear.addActionListener(this);

    }
}