Java

import javax.swing.JFrame;
public class ejemplo {
public static void main(String[] args) {
calc obj =new calc();
obj.setVisible(true);
obj.setLocationRelativeTo(null);
}


}











import javax.swing.JFrame;
public class libreria {
private String cadena;
private double resultado;
private boolean suma;
private boolean resta;private boolean division;
private boolean multiplicacion;
public libreria(){
cadena="";
suma=false;
resta=false;
division=false;
multiplicacion=false;}
public String concatenamiento(String cadena){
this.cadena=this.cadena+cadena;
return this.cadena;
}
public void suma(String cadena){
this.resultado=Double.parseDouble(cadena);suma=true;
this.cadena="";
}
public void resta(String cadena){
this.resultado=Double.parseDouble(cadena);
resta=true;
this.cadena="";
}
public void multiplicacion(String cadena){
this.resultado=Double.parseDouble(cadena);
multiplicacion=true;
this.cadena="";
}
public void division(String cadena){this.resultado=Double.parseDouble(cadena);
division=true;
this.cadena="";
}
public double resultado(String numero){
if(suma==true){
resultado=resultado+Double.parseDouble(numero);
}else
if(resta==true){
resultado=resultado-Double.parseDouble(numero);
}else
if(multiplicacion==true){
resultado=resultado*Double.parseDouble(numero);}else
if(division==true){
resultado=resultado/Double.parseDouble(numero);
}
suma=false;
resta=false;
multiplicacion=false;
division=false;
return resultado;

}

}



















import javax.swing.JFrame;
public class calc extends javax.swing.JFrame {

libreria obj=new libreria();public calc() {
initComponents();
}


@SuppressWarnings("unchecked")
//
private void initComponents() {

jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6= new javax.swing.JButton();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jButton11 = new javax.swing.JButton();
jButton12 = new javax.swing.JButton();
jButton13 = new javax.swing.JButton();
jButton14 = newjavax.swing.JButton();
jButton15 = new javax.swing.JButton();
jButton16 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jButton1.setText("1");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public voidmouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

jButton2.setText("2");
jButton2.addMouseListener(newjava.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton2MouseClicked(evt);
}
});

jButton3.setText("3");
jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton3MouseClicked(evt);
}...