java swing set initial window size code example

Example 1: set size of a jframe

import java.util.*;
public static void main(string args){
JFrame frame = new JFrame();
frame.setSize(200,200); // Where you set size
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}

Example 2: change font size java swing

// make sure the new size is a float, not an int (add f at the end of the number)
label.setFont(label.getFont().deriveFont(newSize));