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Containers: the JFrame

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• The JFrame class
  • Creating a JFrame object:

    JFrame f = new JFrame("Title of the Window");

    Note:

    When a JFrame is created, it is not painted (= visible) !!!

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  • Some important methods on a JFrame:

    setSize(width, height): set the display size of the frame (= window) setVisible(true): make the frame (= window) visible

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  • Example: an empty window

    import java.awt.*; import javax.swing.*; public class Frame1 { public static void main(String[] args) { JFrame f = new JFrame("My First GUI"); // Create Frame f.setSize(400,300); // Set size of frame f.setVisible(true); // Show the window } }

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

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• Adding a GUI component (label) to JFrame
  • Label:

    A label is a box with some text We will use a label to write the traditional first program: the "Hello World" program

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  • Creating a Label:

    JLabel L = new JLabel("Text");

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  • Adding a GUI object onto a JFrame:

    JLabel L = new JLabel("Text"); JFrame f = new JFrame("Window Title"); f.getContentPane().add( L ); // "Stick" object L onto the frame f

    Example:

    import java.awt.*; import javax.swing.*; public class Frame2 { public static void main(String[] args) { JFrame f = new JFrame("My First GUI"); f.setSize(400,300); JLabel L = new JLabel("Hello World !"); f.getContentPane().add( L ); f.setVisible(true); } }

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  • Example Program: /home/cs377001/demo/GUI/Frame2.java                                                
    • Prog file: click here