Code for Console for Java JAR programs in case someone needs it. Description: When you run a jar file by double-clicking on it, you don't get console so all your input/output have to be on GUI. This program solves this problem and gives users/programmers a console which can be used for input/output as done on console by command line programs. So, in effect this program gives a console for JAR programs.
------------------------------------------------------------------------------------------- // License: This file has been released under APACHE LICENSE, VERSION 2.0. // The license details can be found here: https://www.apache.org/licenses/LICENSE-2.0 import java.io.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; public class Console_For_JAR_Programs implements KeyListener, ActionListener { Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); int screenWidth = screenSize.width; int screenHeight = screenSize.height; String title = null; JFrame jf = null; JTextArea jta = null; JScrollPane jsp = null; JMenuBar jmb = null; JMenu jm = null; JMenuItem jmi = null; // key codes int BACKSPACE = 8; int ENTER = 10; int PG_UP = 33; // do nothing for this key pressed int PG_DN = 34; // do nothing for this key pressed int END = 35; int HOME = 36; int LEFT_ARROW = 37; int UP_ARROW = 38; // do nothing for this key pressed //int RIGHT_ARROW = 39; // handled by JTextArea int DOWN_ARROW = 40; // do nothing for this key pressed int CTRL = 128; int A = 65; // disable ctrl-a int H = 72; // handle ctrl-h //int DELETE = 127; // handled by JTextArea int initialCaretPosition = 0; int endOfInputCaretPosition = 0; final Object lock1 = new Object(); final Object lock2 = new Object(); boolean inputAvailable = false; byte[] b = null; int len = -1; int indexIntoByteArray = -1; boolean newLineSent = false; byte endOfInput = -1; byte newLine = 10; boolean enterAlreadyPressedEarlier = false; @Override public void actionPerformed(ActionEvent ae) { int cCurrPos = jta.getCaretPosition(); jta.selectAll(); jta.copy(); jta.select(cCurrPos, cCurrPos); } // end of actionPerformed @Override public void keyTyped(KeyEvent ke) { } // end of keyTyped @Override public void keyReleased(KeyEvent ke) { } // end of keyReleased @Override public void keyPressed(KeyEvent ke) { Thread.currentThread().getId(); int keyCode = ke.getKeyCode(); if ((keyCode == PG_UP) || (keyCode == PG_DN) || (keyCode == UP_ARROW) || (keyCode == DOWN_ARROW) || ((keyCode == A) && (ke.getModifiersEx() == CTRL))) { ke.consume(); } else if ((keyCode == LEFT_ARROW) || (keyCode == BACKSPACE) || ((keyCode == H) && (ke.getModifiersEx() == CTRL))) { synchronized(lock1) { if (jta.getCaretPosition() <= initialCaretPosition) { ke.consume(); } } // end of synchronized block } else if (keyCode == HOME) { synchronized(lock1) { jta.setCaretPosition(initialCaretPosition); ke.consume(); } // end of synchronized block } else if (keyCode == END) { synchronized(lock1) { jta.setCaretPosition(jta.getDocument().getLength()); ke.consume(); } // end of synchronized block } else if (keyCode == ENTER) { // this if block should not exit until all the input has been // processed. synchronized(lock1) { inputAvailable = true; endOfInputCaretPosition = jta.getDocument().getLength(); //if ((endOfInputCaretPosition - initialCaretPosition) == 1) { // only newline was entered, so increment initialCaretPosition if ((enterAlreadyPressedEarlier == true) && (endOfInputCaretPosition - initialCaretPosition) > 0) { // need to increment initialCaretPosition by 1 to account for last enter pressed initialCaretPosition++; } jta.setCaretPosition(jta.getDocument().getLength()); enterAlreadyPressedEarlier = true; lock1.notifyAll(); } // wait until all input has been processed synchronized(lock2) { //if (Thread.holdsLock(lock2) == true) { System.out.println("Thread id: " + Thread.currentThread().getId() + ", lock2 is held"); } else { System.out.println("Thread id: " + Thread.currentThread().getId() + ", lock2 is _not_ held"); } try { lock2.wait(); } catch (Exception e) { //System.out.println("Exception (debug:1): " + e.getMessage()); } } } // end of if else if } // end of keyPressed byte getNextByteFromJTextArea() { String s = ""; Thread.currentThread().getId(); synchronized(lock1) { //if (Thread.holdsLock(lock1) == true) { System.out.println("Thread id: " + Thread.currentThread().getId() + ", lock1 is held"); } else { System.out.println("Thread id: " + Thread.currentThread().getId() + ", lock1 is _not_ held"); } if (inputAvailable == false) { try { lock1.wait(); } catch (Exception e) { //System.out.println("Excpetion (debug:2): " + e.getMessage()); //System.exit(1); } // end of try catch } // end of if inputAvailable if (newLineSent == true) { // send endOfInput now, all input has been prcocessed, anyone // waiting on lock2 should be woken up and some variables // should be re-initialized newLineSent = false; b = null; len = -1; indexIntoByteArray = -1; inputAvailable = false; initialCaretPosition = jta.getDocument().getLength(); endOfInputCaretPosition = jta.getDocument().getLength(); synchronized(lock2) { //if (Thread.holdsLock(lock2) == true) { // System.out.println("lock2 is held..2..Thread id = " + Thread.currentThread().getId()); //} else { // System.out.println("lock2 is ___not___ held..2..Thread id = " + Thread.currentThread().getId()); //} lock2.notifyAll(); return endOfInput; } } // end of if newLineSent if (len == -1) { // read input len = endOfInputCaretPosition - initialCaretPosition; try { s = jta.getText(initialCaretPosition, len); b = s.getBytes(); // enter is still getting processed, the text area // hasn't been updated with the enter, so send a // newline once all bytes have been sent. } catch (Exception e) { //System.out.println("Exception (debug:3): " + e.getMessage()); if (b != null) { Arrays.fill(b, (byte)(-1)); } } // end of try catch } // end of if len == -1 // if control reaches here then it means that we have to send a byte indexIntoByteArray++; if (indexIntoByteArray == len) { // send newLine as all input have been sent already newLineSent = true; return newLine; } if (b[indexIntoByteArray] == newLine) { newLineSent = true; } return b[indexIntoByteArray]; } // end of synchronized block } // end of getNextByteFromJTextArea void outputToJTextArea(byte b) { Thread.currentThread().getId(); synchronized(lock1) { char ch = (char)(b); String text = Character.toString(ch); jta.append(text); jta.setCaretPosition(jta.getDocument().getLength()); initialCaretPosition = jta.getCaretPosition(); enterAlreadyPressedEarlier = false; } } // end of outputToJTextArea void configureJTextAreaForInputOutput() { jta.addKeyListener(this); // remove all mouse listeners for (MouseListener listener : jta.getMouseListeners()) { //outputToJTextArea(jta, "\nRemoving mouse listener\n"); jta.removeMouseListener(listener); } // remove all mouse motion listeners for (MouseMotionListener listener : jta.getMouseMotionListeners()) { //outputToJTextArea(jta, "\nRemoving mouse motion listener\n"); jta.removeMouseMotionListener(listener); } // remove all mouse wheel listeners for (MouseWheelListener listener : jta.getMouseWheelListeners()) { //outputToJTextArea(jta, "\nRemoving mouse wheel listener\n"); jta.removeMouseWheelListener(listener); } System.setIn(new InputStream() { @Override public int read() { // we need to sleep here because of some threading issues //try { // Thread.sleep(1); //} catch (Exception e) { //System.out.println("Exception (debug:4): " + e.getMessage()); //} byte b = getNextByteFromJTextArea(); return ((int)(b)); } }); System.setOut(new PrintStream(new OutputStream() { @Override public void write(int b) { outputToJTextArea((byte)(b)); } })); System.setErr(new PrintStream(new OutputStream() { @Override public void write(int b) { outputToJTextArea((byte)(b)); } })); } // end of configureJTextAreaForInputOutput void createAndShowConsole() { title = "Console"; jf = InitComponents.setupJFrameAndGet(title, (3*screenWidth)/4, (3*screenHeight)/4); jta = InitComponents.setupJTextAreaAndGet("", 5000, 100, true, true, true, false, 0, 0, 0, 0); jta.setBackground(Color.WHITE); jta.setForeground(Color.BLACK); jta.setCaretColor(Color.BLACK); jta.setFont(jta.getFont().deriveFont(13.5f)); configureJTextAreaForInputOutput(); jsp = InitComponents.setupScrollableJTextAreaAndGet(jta, 10, 10, (3*screenWidth)/4 - 33, (3*screenHeight)/4 - 79); jsp.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); jsp.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); jf.add(jsp); jmb = InitComponents.setupJMenuBarAndGet(); jm = InitComponents.setupJMenuAndGet("Copy All to Clipboard"); jm.setBorder(BorderFactory.createLineBorder(Color.green, 2)); jmi = InitComponents.setupJMenuItemAndGet("Copy All to Clipboard"); jm.add(jmi); jmb.add(jm); jmi.addActionListener(this); jf.setJMenuBar(jmb); jf.setLocationRelativeTo(null); jf.setVisible(true); } // end of createAndShowConsole public static void main(String[] args) { Console_For_JAR_Programs cfjpv2 = new Console_For_JAR_Programs(); cfjpv2.createAndShowConsole(); while (true) { try { BufferedReader br = null; String input = ""; System.out.println(); System.out.print("Enter some input (BufferedReader Example) (press enter after inputting): "); br = new BufferedReader(new InputStreamReader(System.in)); input = br.readLine(); System.out.print("User input was: " + input + "\n\n"); //System.err.println("Is this getting printed?\n\n"); System.out.print("Enter an int, then float, then a string (Scanner Example): "); Scanner sc = new Scanner(System.in); int num = sc.nextInt(); float f = sc.nextFloat(); String s = sc.nextLine(); System.out.println("Number: " + num); System.out.println("Float: " + f); System.out.println("String: " + s); } catch (Exception e) { //System.out.println("Exception (debug:5): " + e.getMessage()); } } // end of while true } // end of main } // end of Console_For_JAR_Programs class InitComponents { public static JFrame setupJFrameAndGet(String title, int width, int height) { JFrame tmpJF = new JFrame(title); tmpJF.setSize(width, height); tmpJF.setLocationRelativeTo(null); tmpJF.setLayout(null); tmpJF.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); return tmpJF; } // end of setupJFrameAndGet public static JTextArea setupJTextAreaAndGet(String text, int rows, int columns, boolean setEditableFlag, boolean setLineWrapFlag, boolean setWrapStyleWordFlag, boolean setBoundsFlag, int xpos, int ypos, int width, int height) { JTextArea tmpJTA = new JTextArea(text, rows, columns); tmpJTA.setEditable(setEditableFlag); tmpJTA.setLineWrap(setLineWrapFlag); tmpJTA.setWrapStyleWord(setWrapStyleWordFlag); if (setBoundsFlag == true) { tmpJTA.setBounds(xpos, ypos, width, height); } return tmpJTA; } // end of setupJTextAreaAndGet public static JScrollPane setupScrollableJTextAreaAndGet(JTextArea jta, int xpos, int ypos, int width, int height) { JScrollPane tmpJSP = new JScrollPane(jta); tmpJSP.setBounds(xpos, ypos, width, height); return tmpJSP; } // end of setupScrollableJTextAreaAndGet public static JMenuBar setupJMenuBarAndGet() { JMenuBar tmpJMB = new JMenuBar(); return tmpJMB; } // end of setupJMenuBarAndGet public static JMenu setupJMenuAndGet(String text) { JMenu tmpJM = new JMenu(text); return tmpJM; } // end of setupJMenuAndGet public static JMenuItem setupJMenuItemAndGet(String text) { JMenuItem tmpJMI = new JMenuItem(text); return tmpJMI; } // end of setupJMenuItemAndGet }// end of InitComponents -------------------------------------------------------------------------------------------
