how to make window in java

To create a window in Java, you can use the JFrame class from the javax.swing package.

Here is an example of how you can create a window in Java using the JFrame class:

import javax.swing.JFrame;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("My Window");
        frame.setSize(400, 300);
        frame.setVisible(true);
    }
}

In this example, a JFrame object is created with the desired window title using the JFrame constructor. The setSize method is then used to set the size of the window, and the setVisible method is used to make the window visible.

You can add components to the window by using the add method of the JFrame class. For example:

import javax.swing.JButton;
import javax.swing.JFrame;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("My Window");
        frame.setSize(400, 300);
        
        JButton button = new JButton("Click me!");
        frame.add(button);
        
        frame.setVisible(true);
    }
}

In this example, a JButton object is created and added to the window using the add method.

You can also use layout managers to arrange the components in the window and customize the window's behavior using the various methods and properties of the JFrame class.

Keep in mind that the JFrame class is part of the Swing GUI toolkit, which is an older GUI toolkit for Java that is now superseded by JavaFX. If you are developing a new Java application, you may want to consider using JavaFX instead of Swing for creating windows and other GUI components.