InputOutputStream

SEMOGA INI BISA BERMANFAAT
klo ada masukan silahkan beri komentar

// ini program utama

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;


public class OutputStream {

private JDesktopPane desktop = new JDesktopPane ();

private JMenuBar menu = new JMenuBar();

private JMenuBar menuBar = new JMenuBar();

private JButton btnOpen = new JButton("Open");

public OutputStream(){

JFrame frame = new JFrame("Luas Segitiga");



btnOpen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Internal masuk = new Internal();
desktop.add(masuk);
masuk.setVisible(true);
}
});

btnOpen.setMnemonic('O');

frame.setJMenuBar(menu);

frame.setVisible(true);

frame.setSize(400,500);

menuBar.add(btnOpen);

desktop.setBackground(Color.gray);

frame.getContentPane().add(menuBar, BorderLayout.SOUTH);
frame.getContentPane().add(desktop, BorderLayout.CENTER);

}
public static void main(String [] args){
new OutputStream();
}
}

//ini internalnya

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Internal extends JInternalFrame{

String car = ";";

private JLabel label1 = new JLabel("Alas"),
label2 = new JLabel("Tinggi"),
label3 = new JLabel("Hasil");

private JTextField txt1 = new JTextField(),
txt2 = new JTextField(),
txt3 = new JTextField(),
txt4 = new JTextField(),
txt5 = new JTextField(),
txt6 = new JTextField();

private JButton btnClear = new JButton("Clear"),
btnHasil = new JButton("Hasil"),
btnExit = new JButton("Exit"),
btnSave = new JButton("Save"),
btnLoad = new JButton("Load");

public double Luas(double A, double T){

return (0.5*A*T);
}



private void btnSaveActionPerformed(java.awt.event.ActionEvent e) {
java.io.File file = new java.io.File("Save.txt");
java.io.PrintWriter output = null;
try {
output = new java.io.PrintWriter(file);
} catch (FileNotFoundException ex) {
Logger.getLogger(Internal.class.getName()).log(Level.SEVERE, null, ex);
}
output.print(txt1.getText()+car);
output.print(txt2.getText()+car);
output.print(txt3.getText());
output.close();
JOptionPane.showMessageDialog(null, "Saved Successfully","Success",
JOptionPane.WARNING_MESSAGE);
}

private void btnLoadActionPerformed(java.awt.event.ActionEvent e) {
int respon2 = JOptionPane.showConfirmDialog(null, "Are You Sure ?", "Tanya Dulu...",
JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
java.io.File file = new java.io.File("Save.txt");
Scanner input = null;
try {
input = new Scanner(file);
}
catch (FileNotFoundException ex) {
Logger.getLogger(Internal.class.getName()).log(Level.SEVERE, null, ex);
}
input.useDelimiter(";");
while (input.hasNext())
{
String m = input.next();
String p = input.next();
String q = input.next();
txt1.setText(m);
txt2.setText(p);
txt3.setText(q);
}
input.close();
}

public Internal(){


super("Luas Segitiga",true,true,true,true);


getContentPane().setLayout(null);
label1.setBounds(30,20,100,20);
label2.setBounds(30,60,100,20);
label3.setBounds(30,100,100,20);

txt1.setBounds(100,20,100,20);
txt2.setBounds(100,60,100,20);
txt3.setBounds(100,100,100,20);

btnHasil.setBounds(110,130,70,20);
btnClear.setBounds(70,170,70,20);
btnExit.setBounds(70,200,70,20);
btnSave.setBounds(150,170,70,20);
btnLoad.setBounds(150,200,70,20);

getContentPane().add(label1);
getContentPane().add(label2);
getContentPane().add(label3);

getContentPane().add(txt1);
getContentPane().add(txt2);
getContentPane().add(txt3);

getContentPane().add(btnClear);
getContentPane().add(btnHasil);
getContentPane().add(btnExit);
getContentPane().add(btnSave);
getContentPane().add(btnLoad);

btnHasil.setMnemonic(KeyEvent.VK_H);
btnClear.setMnemonic(KeyEvent.VK_C);
btnExit.setMnemonic(KeyEvent.VK_E);
btnSave.setMnemonic(KeyEvent.VK_S);
btnLoad.setMnemonic(KeyEvent.VK_L);

btnHasil.addActionListener (new ActionListener(){
public void actionPerformed(ActionEvent e){
double A = Double.parseDouble(txt1.getText());
double T = Double.parseDouble(txt2.getText());
double luas = Luas(A,T);
txt3.setText(""+luas);
}
});

btnClear.addActionListener (new ActionListener(){
public void actionPerformed(ActionEvent e){
txt1.setText("");
txt2.setText("");
txt3.setText("");

}
});

btnExit.addActionListener (new ActionListener(){
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});


btnSave.setText("Save");
btnSave.setFocusable(false);
btnSave.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
btnSave.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
btnSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
btnSaveActionPerformed(e);
}
});

btnLoad.setText("Load");
btnLoad.setFocusable(false);
btnLoad.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
btnLoad.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
btnLoad.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
btnLoadActionPerformed(e);
}
});

setVisible(true);
setSize(300,300);
}
}

ini OUTPUTnya