Thread: setSize() not working

Hello, Sorry if this question is noobish i just started java 2 days ago when tried to make the setSize() statement it gave this error that i don't understand

Multiple markers at this line
- Syntax error on tokens, delete these tokens
- Syntax error on token(s), misplaced construct(s)
- Syntax error on token "setSize", invalid

And here is the code if you need it

Page One

 
public class jframeTest {
public static void main(String args[]) {
 
 
}
}

Second Page

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class GUI extends JFrame {
	private static final long serialVersionUID = 1L;
 
	// First Window
	JFrame firstWindow = new JFrame("Calculator");
	firstWindow.setSize(200, 150);
	firstWindow.setVisable(true);
}

Hi 812d,
I will explain this as I understand it, which should not be taken as gospel or technically correct but should help you out. The area where you use setSize, and setVisible for that matter, is where you would normally declare/initialize variables. So, since setSize is a method that modifies the object (variable) firstWindow the compiler gets upset. Take a peek at what a class constructor is in Java and how they are used. If you do so I am sure you will find the answer to your problem. I should note that this is a case of "There's more than one way to skin a cat." but if you figure out this one way you may be able to figure out the others.

1) Class names should always start with capital letters.

2) Your class GUI already extends JFrame, creating a new JFrame within is probably not what you want.

3) Methods (like, for example, setSize(...)) must be called from within other methods. Define a method and put those statements within the method body.

Hello, Sorry if this question is noobish i just started java 2 days ago when tried to make the setSize() statement it gave this error that i don't understand

If you've only 2 days of Java experience, you've leapt into GUI programming too quickly.

The primary mistake you've made - Cornix' number 3 - indicates a lack of understanding or experience with basic program construction that will be remedied with more study in and practice with Java's basics. Please slow down and give yourself a decent chance by spending a few months (or more) working through the basics.