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Putting scroll bars on a text area

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• Putting Scroll Bars on a JTextArea component
  • A text area can scroll horizontally and/or vertically

  • The swing class that implement text area with scroll bar objects is: JScrollPane

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  • NOTE:

    The JScrollPane adds functionality to a JTextArea You keep using the (original) JTextArea object for input and output

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  • Putting a vertical scroll bar to a JTextArea:

    JTextArea x = new JTextArea(); JScrollPane y = new JScrollPane( x, VERTICAL_SCROLLBAR_ALWAYS, HORIZONTAL_SCROLLBAR_NEVER);

    Putting horizontal and vertical scroll bar to a JTextArea:

    JTextArea x = new JTextArea(); JScrollPane y = new JScrollPane( x, VERTICAL_SCROLLBAR_ALWAYS , HORIZONTAL_SCROLLBAR_ALWAYS);

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  • Example JTextArea program with ScrollBars:

    import java.awt.*; import javax.swing.*; public class ScrollPane { public static void main(String[] args) { JFrame f = new JFrame("My GUI"); JTextArea x; JScrollPane y; x = new JTextArea(); // Make a JTextArea x.setEditable(true); // Output only y = new JScrollPane(x, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); f.getContentPane().add(y); // Add y !!! x.setText("Hello World"); // Use x to read/write text x.append("\n\n\n"); x.append("Hello Again"); x.append("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"); x.append("Bye now...."); f.setSize(400, 300); f.setVisible(true); } }

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  • Example Program: (Demo above code)                                                
    • Prog file: click here

    How to run the program:

    Right click on link(s) and save in a scratch directory To compile:   javac ScrollPane.java To run:          java ScrollPane