I expect part of my frame contains the JTextArea but it occupies entirely. I cannot trace the error here.
import java.awt.*;
import javax.swing.*;
public class EchoServer
{
public static void main(String args[])
{
CalcFrame c = new CalcFrame();
CalcTextArea a = new CalcTextArea();
}
}
class CalcTextArea
{
JTextArea historyDisplayer = new JTextArea("",50,20);
CalcTextArea()
{
//historyDisplayer.setVisible(true);
historyDisplayer.insert("Hello World", 0);
Color bg = new Color(23,34,56);
historyDisplayer.setBackground(bg);
historyDisplayer.setBackground(bg);
}
}
class CalcFrame extends CalcTextArea
{
JFrame frame = new JFrame();
CalcFrame()
{
frame.setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
frame.setTitle("CALCULATOR");
frame.setVisible(true);
frame.add(historyDisplayer);
}
private static int DEFAULT_WIDTH = 299,DEFAULT_HEIGHT = 190;
}
JFrame
by default uses BorderLayout
. When you just add something onto a BorderLayout
component like JFrame
, it would add to the very center of the BorderLayout
(if you did not specify where to add the component), and it takes up the entire JFrame
.
You should use the correct layout to adjust them.
You can try using Absolute layout. It's on the Layouts Pallet.
Or enable it with :
frame = new JFrame();
... //your code here
// to set absolute layout.
frame.getContentPane().setLayout(null);
This way, you can freely place the control anywhere you like.
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