#TwoFrame.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson10;

/**
 *
 * @author Diep.Tran
 */
public class TwoFrame extends javax.swing.JFrame {

    /**
     * Creates new form TwoFrame
     */
    public TwoFrame() {
        initComponents();
        
        msgLabel.setText(DataController.getInstance().getMsg());
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        msgLabel = new javax.swing.JLabel();
        backBtn = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        msgLabel.setText("jLabel1");

        backBtn.setText("Back Frame");
        backBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                backBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(39, 39, 39)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(msgLabel)
                    .addComponent(backBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 470, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(42, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addComponent(msgLabel)
                .addGap(30, 30, 30)
                .addComponent(backBtn)
                .addContainerGap(244, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void backBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_backBtnActionPerformed
        // TODO add your handling code here:
        setVisible(false);
        dispose();
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new OneFrame().setVisible(true);
            }
        });
    }//GEN-LAST:event_backBtnActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TwoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TwoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TwoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TwoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TwoFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton backBtn;
    private javax.swing.JLabel msgLabel;
    // End of variables declaration//GEN-END:variables
}

#Test.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson10;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Test {
    public static void main(String[] args) {
        try {
            Scanner scan = new Scanner(System.in);
            System.out.println("Nhap ten: ");
            String name = scan.nextLine();
            
            System.out.println("name: " + name);
            
            //Java2: Console, Java UI (swing)
            //Nhap du lieu tu ban phim -> Ko su dung Scanner
            //Doc ghi File -> database -> Su dung thu vien -> FILE.
            InputStreamReader reader = new InputStreamReader(System.in);
            BufferedReader bufferedReader = new BufferedReader(reader);
            
            System.out.println("Nhap dia chi: ");
            String address = bufferedReader.readLine();
            System.out.println("Dia chi: " + address);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

#OneFrame.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson10;

import javax.swing.JOptionPane;

/**
 *
 * @author Diep.Tran
 */
public class OneFrame extends javax.swing.JFrame {

    /**
     * Creates new form OneFrame
     */
    public OneFrame() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        msgTxt = new javax.swing.JTextField();
        msgBtn = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        msgBtn.setText("Show Msg Another Frame");
        msgBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                msgBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(23, 23, 23)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(msgBtn)
                    .addComponent(msgTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 479, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(27, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addComponent(msgTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(28, 28, 28)
                .addComponent(msgBtn)
                .addContainerGap(237, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void msgBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_msgBtnActionPerformed
        // TODO add your handling code here:
        String msg = msgTxt.getText();
        DataController.getInstance().setMsg(msg);
        
        if(msg.trim().length() == 0) {
            JOptionPane.showMessageDialog(rootPane, "Yeu cau nhap thong tin.");
            return;
        }
        //CHECK DATABASE -> OK -> NEXT SCREEN & THONG BAO ERROR.
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TwoFrame().setVisible(true);
                setVisible(false);
                dispose();
            }
        });
    }//GEN-LAST:event_msgBtnActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(OneFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(OneFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(OneFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(OneFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new OneFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton msgBtn;
    private javax.swing.JTextField msgTxt;
    // End of variables declaration//GEN-END:variables
}

#Main.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson10;

import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) throws IOException {
        final int x = 5;
        final int y;
        y = 10;
        
        System.out.println("x = " + x + ", y = " + y);
        
        SubMain sm = new SubMain();
        sm.x = 6;
        sm.y = 12;
        System.out.println("x = " + sm.x + ", y = " + sm.y);
        
        B b = new B();
        b.showA();
        
        A a = () -> {
            System.out.println("123456");
            //Su dung trong 1 lan thoi => Dung thuong xuyen
            //Runnable -> Thread
        };
        a.showA();
        
        System.out.println("dasdsad");
        
        FileHandler handler = new FileHandler("app.log");
        
        Logger logger = Logger.getLogger("abc");
        
        logger.addHandler(handler);
        
        logger.log(Level.INFO, "ssdjfkhdsfkjdshfds");
    }
    
    static class SubMain {
        int x, y;
    }
    
    @FunctionalInterface
    static interface  A {
        void showA();
    }
    
    static class B implements A {

        @Override
        public void showA() {
        }
        
    }
}

#DataController.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson10;

/**
 *
 * @author Diep.Tran
 */
public class DataController {
    String msg;
    
    private static DataController instance = null;
    
    private DataController() {
    }
    
    public synchronized static DataController getInstance() {
        if(instance == null) {
            instance = new DataController();
        }
        return instance;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}