Esercitazione 12-12-2008

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Grafica1 {
private JFrame f;
private Pannello1 p;
private JButton b1;
public Grafica1(){
f=new JFrame("prova pannello");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300,300);
b1=new JButton("cambia clolore casuale");
f.setLayout(new GridLayout(2,1));
p=new Pannello1();
f.add(b1);
f.add(p);
f.setVisible(true);
}
public class Pannello1 extends JPanel {
public void paintComponent(Graphics g){
Graphics2D g2D=(Graphics2D) g;
int verde=(int) (Math.random()*255);
int rosso=(int) (Math.random()*255);
int blu=(int) (Math.random()*255);
Color colore=new Color(rosso,verde,blu);
g2D.setColor(colore);
g2D.fillOval(0,0,70,70);
}
}
public static void main(String[] args){
Grafica1 g1=new Grafica1();
}
}

Calcolatrice

Esercitazione a scuola...

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Finestra2 implements ActionListener{
JLabel l1=new JLabel("primo numero");
JLabel l2=new JLabel("secondo numero");
JTextField t1=new JTextField();
JTextField t2=new JTextField();
JButton b1=new JButton("+");
JTextField risultato=new JTextField();
public void creaForm1(){
JFrame finestra1=new JFrame("finestra IVL");
finestra1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
finestra1.setSize(300,300);
finestra1.setLayout(new GridLayout(3,2));
finestra1.add(l1);
finestra1.add(t1);
finestra1.add(l2);
finestra1.add(t2);
finestra1.add(b1);
finestra1.add(risultato);
b1.addActionListener(this);
finestra1.setVisible(true);
}
public void actionPerformed(ActionEvent event){
String testo1=t1.getText();
String testo2=t2.getText();
int a=Integer.parseInt(testo1);
int b=Integer.parseInt(testo2);
int somma=a+b;
String r=Integer.toString(somma);
risultato.setText(r);
}
}

Finestra in java...Esercitazione 1-12-08

import javax.swing.*;
public class Finestra1 {
public void creaForm1(){
JFrame finestra1=new JFrame("finestra IVL");
finestra1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
finestra1.setSize(300,300);
finestra1.setVisible(true);
}
}

public class TestaFinestra{
public static void main(String[] args){
Finestra1 f=new Finestra1();
f.creaForm1();
}
}