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Thread: how do I keep a persistent prompt in JTextArea and allow user input

  1. #1
    Junior Member
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    Feb 2010
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    Default how do I keep a persistent prompt in JTextArea and allow user input

    I'm trying to simulate a unix command prompt and accept input at the same time. For example, I'd like to show the prompt "localhost#>" and program it to answer to commands like ifconifig -a and show the results as if it were a unix host. After the user types enter I would like to show the prompt again along with the results of the typed commands. I think I've gone through every single JTextArea tutorial Sun has but is has not helped. How can I do this please?

  2. #2
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    Default Re: how do I keep a persistent prompt in JTextArea and allow user input

    import java.util.Scanner;

    declare the following in your constructor:
    source = new Scanner(System.in);

    declare the variable:
    private Scanner source;

    us this method for your command prompt:
    public void getCommands()
    	        System.out.println("1. Command");
    	        System.out.println("2. Command");
    	        System.out.println("3. Command);
    	        System.out.println("4. exit");
    	        System.out.println("    ");
    	        System.out.print("Input: ");
    	            int s = source.nextInt();
    	            if ( s == 1 ){
    	            	//do something
    	            } else if (s == 2){
    	            	//do something
    	            } else if (s == 3){
    	            	//do something
    	            } else if (s == 4){
    	             System.out.println("Exit selected, have a nice day!");

    I think this is what you are trying to do. This will create a command line program and will be controlled in terminal. You could also add and else if for command not found aswell.
    Last edited by helloworld922; February 23rd, 2010 at 04:11 PM. Reason: please use [code] tags

  3. #3
    Member wolfgar's Avatar
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    Default Re: how do I keep a persistent prompt in JTextArea and allow user input

    i think this is kind of what ur looking for , though its a jtextfield i think most of the essential stuff can transfer over

    add(getJTextField0(), //the constrains and stuff);
    //the method to get the text field added
    public JTextField getJTextField0() {
    	if (jTextField0 == null) {
    		jTextField0 = new JTextField();
    		jTextField0.setText("Type Here");
    		jTextField0.addKeyListener(new KeyAdapter() {
    			public void keyReleased(KeyEvent event) {
    	return jTextField0;
    // the key listener and text field input collector 
    public void jTextField0KeyKeyReleased(KeyEvent event) {
       if (event.getKeyCode() == /* the enter key's code*/ ){
          String input = jTextField0.getText();
          // do what ever the command would do
    Last edited by wolfgar; February 23rd, 2010 at 01:18 PM. Reason: noticed it was area u needed and not field XP
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