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import javax.swing.*;
import java.awt.event.*;
public class Problema1 extends JFrame implements ActionListener{
private
private
private
private
JTextField txt1,txt2,txt3;
ButtonGroup bg1;
JRadioButton radio1,radio2;
JButton boton1;
public Problema1() {
setLayout(null);
txt1=new JTextField();
txt1.setBounds(10,10,100,30);
add(txt1);
txt2=new JTextField();
txt2.setBounds(10,60,100,30);
add(txt2);
txt3=new JTextField();
txt3.setBounds(10,110,100,30);
add(txt3);
bg1=new ButtonGroup();
radio1=new JRadioButton("Suma");
radio1.setBounds(150,10,100,30);
bg1.add(radio1);
add(radio1);
radio2=new JRadioButton("Resta");
radio2.setBounds(150,50,100,30);
bg1.add(radio2);
add(radio2);
boton1=new JButton("Aceptar");
boton1.setBounds(150,180,100,30);
boton1.addActionListener(this);
add(boton1);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource()==boton1) {
int valor1=Integer.parseInt(txt1.getText());
int valor2=Integer.parseInt(txt2.getText());
int total=0;
if (radio1.isSelected()) {
total=valor1+valor2;
}
if (radio2.isSelected()) {
total=valor1-valor2;
}
String cadena=String.valueOf( total) ;
txt3.setText(cadena);
// setTitle(Cadena);
}
}
public static void main(String[] ar) {
Problema1 formulario1=new Problema1();
formulario1.setBounds(0,0,350,250);
formulario1.setVisible(true);
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Problema2 extends JFrame implements ActionListener{
private JTextField textfield1;
private JTextArea textarea1;
public JButton verTabla,salir;
public Problema2() {
setLayout(null);
textfield1=new JTextField();
textfield1.setBounds(10,10,200,30);
add(textfield1);
textarea1=new JTextArea();
textarea1.setBounds(10,50,300,300);
add(textarea1);
verTabla = new JButton("Ver tabla");
verTabla.setBounds(350,50,100,30);
verTabla.addActionListener(this);
add(verTabla);
salir = new JButton("Salir");
salir.setBounds(350,100,100,30);
salir.addActionListener(this);
add(salir);
}
public void actionPerformed(ActionEvent e) {
textarea1.setText(null);
if (e.getSource()==salir) {
System.exit(0);
}
if (e.getSource()==verTabla) {
int resultado;
String linea;
String factor2Cadena= textfield1.getText();
int factor2=Integer.parseInt(factor2Cadena);
for(int factor1=1;factor1<=10;factor1++){
resultado = factor1*factor2;
linea = factor2Cadena +" x "+String.valueOf(factor1)+
" = "+String.valueOf(resultado)+ "\n";
textarea1.setText( textarea1.getText() + linea);
// conceptualmente es una concatenacion
// textarea1=textarea1+linea
//textarea1.append( linea ); //alternativa
}
textfield1.setText(null);
}
}
public static void main(String[] ar) {
Problema2 formulario1=new Problema2();
formulario1.setBounds(0,0,540,400);
formulario1.setVisible(true);
}
}