TestaInputMouse

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;


public class TestaInputMouse{
private JFrame f=new JFrame("mouse input");
private Pannello p=new Pannello();
int clickx;
int clicky;
int clickxP;
int clickyP;
int clickxR;
int clickyR;

public TestaInputMouse(){
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(500,500);
f.add(p);
f.setVisible(true);
f.addMouseListener(new Mouse());
f.setVisible(true);

}



public class Pannello extends JPanel{
public void paintComponent(Graphics g){
String tizio="mouse cliccato "+clickx+", "+clicky;
g.drawString(tizio,10,20);
tizio="mouse premuto a cord. "+clickxP+", "+clickyP;
g.drawString(tizio,10,40);
tizio="mouse premuto rilsciato "+clickxR+", "+clickyR;
g.drawString(tizio,10,60);
g.fillRect(clickx,clicky,10,20);
}

}


public static void main(String[] args){
TestaInputMouse t=new TestaInputMouse();
}
public class Mouse implements MouseListener{
public void mousePressed(MouseEvent e){
clickxP=e.getX()-5;
clickyP=e.getY()-24;
f.repaint();
}
public void mouseReleased(MouseEvent e){
clickxR=e.getX()-5;
clickyR=e.getY()-24;
f.repaint();
}
public void mouseClicked(MouseEvent e){
clickx=e.getX()-5;
clicky=e.getY()-24;
f.repaint();
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
}
}
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ALBERO NATALE

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class AlberoNatale{
private JFrame albero;
private PannelloAlbero a;
private JButton accende;
private JButton spegne;
public AlberoNatale(){
albero=new JFrame("Albero del santo Natale 2008");
albero.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
albero.setSize(500,500);
a=new PannelloAlbero();
accende=new JButton("accendi lampadine");
spegne=new JButton("spegne le lampadine");
albero.add(a,BorderLayout.CENTER);
albero.add(accende,BorderLayout.SOUTH);
albero.setVisible(true);
}

public class PannelloAlbero extends JPanel{
public void paintComponent(Graphics g){
Graphics g2d=(Graphics2D) g;
Image alberoImmagine=new ImageIcon("albNat.jpg").getImage();
g.drawImage(alberoImmagine,0,0,albero.getWidth(),albero.getHeight(),null);
}
}
public static void main(String[] args){
AlberoNatale albero=new AlberoNatale();
}
}
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CALCOLATRICE

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);
}
}

l'operazione della somma viene svolta cliccando sul "+" tramite l'applet!

Somma

import javax.swing.JOptionPane;public class Somma{ public static void main(String[] args){ String primoNumero=JOptionPane.showInputDialog("digita il primo numero"); String secondoNumero=JOptionPane.showInputDialog("digita il secondo numero"); int a=Integer.parseInt(primoNumero); int b=Integer.parseInt(secondoNumero); int c=a+b; JOptionPane.showMessageDialog(null, "somma= " + c, "somma di due interi", JOptionPane.PLAIN_MESSAGE); }}

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Come costruire una finestra

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); }
}

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public class TestaFinestra1{ public static void main(String[] args){ Finestra1 f=new Finestra1(); f.creaForm1(); }
}

ROTAZIONE POLIGONO

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
import java.awt.geom.*;
public class RotazionePoligono extends Applet implements MouseListener, KeyListener{
private int[] xpoints={0,-10,-7,7,10};
private int[] ypoints={-10,-2,10,10,-2};
private Polygon poly;

int rotation=0;
public void init(){
poly=new Polygon(xpoints,ypoints,xpoints.length);
addMouseListener(this);
addKeyListener(this);
}
public void paint(Graphics g){
Graphics2D g2d=(Graphics2D) g;
int ampiezza=getSize().width;
int altezza=getSize().height;
g2d.setColor(Color.BLACK);
g2d.fillRect(0,0,ampiezza,altezza);
g2d.translate(ampiezza/2,altezza/2);
g2d.scale(20,20);
g2d.rotate(Math.toRadians(rotation));
g2d.setColor(Color.RED);
g2d.draw(poly);
g2d.setColor(Color.BLUE);
g2d.fill(poly);
}
public void mouseEntered(MouseEvent m){}
public void mouseExited(MouseEvent m){}
public void mouseReleased(MouseEvent m){}
public void mouseClicked(MouseEvent m){}
public void mousePressed(MouseEvent m){
switch(m.getButton()){
case MouseEvent.BUTTON1:
rotation--;
if(rotation<0) rotation="359;">360) rotation=0;
repaint();
break;
}
}
public void keyReleased(KeyEvent k){}
public void keyTyped(KeyEvent k){}
public void keyPressed(KeyEvent k){
switch(k.getKeyCode()){
case KeyEvent.VK_LEFT:
rotation--;
if(rotation<0) rotation="359;">360) rotation=0;
repaint();
break;
}
}
}



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seconda applet

import java.awt.*;
import java.applet.*;
public class SecondaApplet extends Applet{
public void paint(Graphics g){
Graphics2D g2d= (Graphics2D) g;
Rectangle r=new Rectangle(10,10,50,20);
g2d.draw(r);
}
}


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