Thread: Gap between GUI elements

Hey, I'm using the following code to make an interface, but for some reason there is a massive gap between the text fields and the next panel. Any idea how I can fix this and make it a smaller gap?

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
 
 
class MyFrame extends JFrame
{
	public MyFrame()
	{
		//frame settings
		setVisible (true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("trololo");
		setLocation(300,300);
		setSize(300, 300);
 
		//declarations
		JButton[][] Keypad = new JButton[4][4];
		String[][] KeypadLabels = {{"7","4","1","0"},{"8","5","2","C"},{"9","6","3","!"},{"+","-","*","="}};
		JTextField ScreenOut = new JTextField("asd");
		JTextField ScreenIn = new JTextField("asd");
		JMenuBar Toolbar = new JMenuBar();
		JMenu Options = new JMenu("Options");
		JPanel Section1 = new JPanel();
		JPanel Section2 = new JPanel();
		JPanel Section3 = new JPanel();
 
 
		//containers
		java.awt.Container c = getContentPane();
		c.setLayout(new java.awt.GridLayout(3,1, 0, 0));
		Section1.setLayout(new java.awt.FlowLayout());
		Section1.add(ScreenIn);
		Section2.setLayout(new java.awt.GridLayout(4,4));
		Section3.setLayout(new java.awt.FlowLayout());
		Section3.add(ScreenOut);
		c.add(Section1);
		c.add(Section2);
		c.add(Section3);
		Toolbar.add(Options);
		setJMenuBar(Toolbar);
 
 
		//keypad
		int count =0;
		for (int col =0; col<4;col++)
		{
			for (int row = 0; row<4;row++)
			{
				Keypad[col][row] = new JButton("");
				Section2.add(Keypad[col][row]);;
				Keypad[col][row].setLabel(KeypadLabels[row][col]);
				count++;
			}
		}
	}
}

class calculator
{
	public static void main(String Args[])
	{
		MyFrame f1 = new MyFrame();
	}
}

Thanks in advance

Layout managers can look pretty daunting at first, there are so many to choose from - I recommend reading up on BorderLayout first, it is often the most useful top-level layout for GUIs like yours, and it is a lot simpler to use than GridLayout (unless you really need a grid).