JAVA GUI

Created by	BBorhan
Last edited time	@March 4, 2024 8:01 PM
Tag

JFRAME : A GUI window to add components to

import java.awt.Color;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
......
		JFrame frame = new JFrame();
		frame.setTitle("Title"); // title on title bar
		frame.setSize(420, 420); // width and height
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // operation when click on exit button
		frame.setResizable(false); // the frame resizable or not
		frame.setVisible(true); // frame visibility
		
// adding frame icon on top left
		ImageIcon image = new ImageIcon("logo.jpg");
		frame.setIconImage(image.getImage());
// changing frame background
		frame.getContentPane().setBackground(new Color(0xFFFFFF));

JLabel : A GUI display are for a string of text, an image or both

import java.awt.Color;
import java.awt.Font;

import javax.swing.*;
import javax.swing.border.Border;
....
JLabel label = new JLabel();
		label.setText("Hello world");
		Border border = BorderFactory.createLineBorder(Color.green, 3); // border
		
		ImageIcon image = new ImageIcon("logo.jpg");
		label.setIcon(image);
		label.setHorizontalTextPosition(JLabel.CENTER); // Text position horizontally relative to icon, LEFT, CENTER or RIght
		label.setVerticalTextPosition(JLabel.TOP); // Text position vertically relative to icon, TOP, CENTER or BOTTOM
		label.setForeground(Color.green); // Text color
		label.setFont(new Font("Roboto", Font.BOLD , 20)); // set font
		label.setIconTextGap(10); // gap between image and text
		label.setBackground(Color.black); // bg of whole label
		label.setOpaque(true); // to show bg
		label.setBorder(border);
		label.setVerticalAlignment(JLabel.CENTER);
		label.setHorizontalAlignment(JLabel.CENTER);
		
		
		JFrame frame = new JFrame();
		frame.setSize(500, 500);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.add(label);
		
// to specifies the label dimension and w, h
		frame.setLayout(null); // it refers that we will manually set dimension of labels or these
		label.setBounds(10, 10, 200, 200);

JPanel : A GUI component that functions as a container to hold other components

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;

import javax.swing.*;
import javax.swing.border.Border;

...
		JLabel label = new JLabel("Hi");
		JLabel label2 = new JLabel("Hi");
		JLabel label3 = new JLabel("Hi");
		
		JPanel redpanel = new JPanel();
		redpanel.setBackground(Color.red);
		redpanel.setBounds(0, 0,250, 250);
		
		JPanel bluepanel = new JPanel();
		bluepanel.setBackground(Color.blue);
		bluepanel.setBounds(250, 0, 250, 250);
		bluepanel.setLayout(null);
		label3.setBounds(0, 0, 100, 100);
		
		JPanel greenpanel = new JPanel();
		greenpanel.setBackground(Color.green);
		greenpanel.setBounds(0, 250, 500, 250);
		greenpanel.setLayout(new BorderLayout());
		
		JFrame frame = new JFrame();
		frame.setTitle("Title");
		frame.setSize(500, 500);
		frame.getContentPane().setBackground(new Color(0xFFFFFF));
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLayout(null);
		
		redpanel.add(label);
		greenpanel.add(label2);
		bluepanel.add(label3);
		frame.add(redpanel);
		frame.add(bluepanel);
		frame.add(greenpanel);
	...

JButton : a button that performs an action when clicked on

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class Button extends JFrame {
	static JButton btn;
	Button() {
		btn = new JButton();
		btn.setBounds(200, 100, 100, 20);
		btn.addActionListener(e -> System.out.println("Clickd"));
		btn.setText("Button");
		btn.setFocusable(false);
		btn.setForeground(Color.red);
		btn.setBackground(Color.black);
		btn.setBorder(BorderFactory.createEtchedBorder());
		//btn.setEnabled(false);
		
		this.setSize(500, 500);
		this.setVisible(true);
		this.setLayout(null);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.add(btn);
	
	}

}

FlowLayout : Places components in a row, sized at their preferred size. if the horizontal space in the container is too small, the flowlayout class uses the next available row.

import java.awt.FlowLayout;

import javax.swing.*;

public class Flowlayout extends JFrame {
	Flowlayout(){
		this.setSize(500, 500);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.setLayout(new FlowLayout(FlowLayout.LEADING, 10, 20));
		
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		
		this.setVisible(true);

	}
}

GridLayout: Places components in a grid of cells. Each component takes all the available space within its cell and each cell is the same size

import java.awt.GridLayout;

import javax.swing.*;

public class Gridlayout extends JFrame{
	Gridlayout(){
		this.setSize(500, 500);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.setLayout(new GridLayout(3, 3, 10, 10)); //x,y, h-margin, v-margin
		
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		this.add(new JButton("1"));
		
		this.setVisible(true);
	}
}

JLayeredPane : Swing container that provides a third dimension for positioning components. ex : depth, z-index

import java.awt.Color;

import javax.swing.*;

public class Jlayeredpane extends JFrame{
	Jlayeredpane(){
		JLabel label1 = new JLabel();
		label1.setOpaque(true);
		label1.setBackground(Color.black);
		label1.setBounds(50, 50, 200, 200);
		
		JLabel label2 = new JLabel();
		label2.setOpaque(true);
		label2.setBackground(Color.red);
		label2.setBounds(100, 100, 200, 200);

		JLabel label3 = new JLabel();
		label3.setOpaque(true);
		label3.setBackground(Color.blue);
		label3.setBounds(150, 150, 200, 200);
		
		JLayeredPane layeredPane = new JLayeredPane();
		layeredPane.setBounds(0, 0, 500, 500);
		//layeredPane.add(label1, JLayeredPane.DRAG_LAYER);
		//layeredPane.add(label2, JLayeredPane.PALETTE_LAYER);
		//layeredPane.add(label3, JLayeredPane.DEFAULT_LAYER);
		layeredPane.add(label1, Integer.valueOf(0));
		layeredPane.add(label2, Integer.valueOf(100));
		layeredPane.add(label3, Integer.valueOf(1));		
		
		this.setSize(500, 500);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.setLayout(null);
		this.add(layeredPane);
		this.setVisible(true);
	}
}

Opening new window

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Newwindow implements ActionListener{
	JFrame frame = new JFrame();
	JButton btn = new JButton("new window");
	Newwindow(){
		frame.setSize(500, 500);
		frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
		frame.setLayout(null);
		btn.setBounds(100, 150, 200, 20);
		btn.setFocusable(false);
		btn.addActionListener(this);
		frame.add(btn);
		frame.setVisible(true);
	}
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == btn) {
			frame.dispose();
			Demonewwindow mywindow = new Demonewwindow();
		}
	}
}

JOptionPane : pop up a standard dialog box that prompts users for a value or informs them of something

import javax.swing.ImageIcon;
import javax.swing.JOptionPane;

public class Joptionpane {
	Joptionpane(){
		JOptionPane.showMessageDialog(null, "INfooo", "title", JOptionPane.PLAIN_MESSAGE);
		JOptionPane.showMessageDialog(null, "INfooo", "title", JOptionPane.INFORMATION_MESSAGE);
		JOptionPane.showMessageDialog(null, "INfooo", "title", JOptionPane.QUESTION_MESSAGE);		
		JOptionPane.showMessageDialog(null, "INfooo", "title", JOptionPane.WARNING_MESSAGE);
		JOptionPane.showMessageDialog(null, "INfooo", "title", JOptionPane.ERROR_MESSAGE);

		
		int n = JOptionPane.showConfirmDialog(null, "Infooo", "Title", JOptionPane.YES_NO_CANCEL_OPTION);
		System.out.println(n);
		

		
		String name = JOptionPane.showInputDialog("Name");
		System.out.print(name);
		
		
		String [] res = {"Option 1", "Option 2", "Option 3"};
		ImageIcon icon = new ImageIcon("logo.jpg");
		
		JOptionPane.showOptionDialog(null, "Infoo", "title", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, icon, res, 0);
	}
}

Checkbox

import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class Checkbox implements ActionListener{
	JFrame frame = new JFrame();
	JCheckBox checkbox;
	JButton btn = new JButton();
	Checkbox(){
		frame.setSize(500, 500);
		frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
		frame.setLayout(new FlowLayout());
		
		checkbox = new JCheckBox();
		checkbox.setText("I am not robot");
		checkbox.setFocusable(false);
		checkbox.setFont(new Font("Tahoma", Font.PLAIN, 12));
		btn.setText("Submit");
		btn.addActionListener(this);
		
		frame.add(checkbox);
		frame.add(btn);
		frame.pack();
		frame.setVisible(true);				
	};
	
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == btn) {
			System.out.println(checkbox.isSelected());
		}
	}
}

Radio button

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JRadioButton;

public class Radiobtn extends JFrame implements ActionListener{
	JRadioButton r1, r2, r3;
	Radiobtn(){
		this.setTitle("Title");
		this.setSize(500, 500);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setLayout(new FlowLayout());
		
		
		 r1 = new JRadioButton("R1");
		 r2 = new JRadioButton("R2");
		 r3 = new JRadioButton("R3");
		
		ButtonGroup group = new ButtonGroup();
		
		group.add(r1); group.add(r2); group.add(r3);
		this.add(r1); this.add(r2); this.add(r3);
		r1.addActionListener(this);
		r2.addActionListener(this);
		r3.addActionListener(this);
		this.setVisible(true);
		
		ImageIcon image = new ImageIcon("logo.jpg");
		this.setIconImage(image.getImage());
		this.getContentPane().setBackground(new Color(255,255,255));

	}
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == r1) {
			System.out.println("R1");
		}
		if(e.getSource() == r2) {
			System.out.println("R2");
		}
		if(e.getSource() == r3) {
			System.out.println("R3");
		}
	}
}