Yin Yang Java Swing Program

I wrote this simple YinYang Java Swing Program in my CS202 class back in Spring 2008 at CalStateLA. I thought to share with all.

Code

package com.gaurangjadia.code.java;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JFrame;

public class YinYang extends JFrame {

	private static final long serialVersionUID = 1L;

	public YinYang(){
		super("Yin-Yang Draw Application.");
		this.setSize(500,500);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public void paint(Graphics g){
		super.paint(g);

		int xCenter = getWidth() / 2;
		int yCenter = getHeight() / 2;
		int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4);
		int x = xCenter - radius;
		int y = yCenter - radius;

		g.setColor(Color.white);
		g.fillOval(x, y, 2 * radius, 2 * radius);
		g.setColor(Color.black);
		g.drawOval(x, y, 2 * radius, 2 * radius);
		g.setColor(Color.black);
		g.fillArc(x, y, 2 * radius, 2 * radius, 270, 180);
		g.setColor(Color.white);
		g.fillOval(x + (radius / 2), y, radius, radius);
		g.setColor(Color.black);
		g.fillOval(x + (radius / 2), y + radius, radius, radius);

		g.setColor(Color.black);
		g.fillOval(x + radius - (radius / 4), y + radius / 4, radius / 2, radius / 2);
		g.setColor(Color.white);
		g.fillOval(x + radius - (radius / 4), y + radius + radius / 4, radius / 2, radius / 2);
	}

	public static void main(String args[]) {
		YinYang objYinYang = new YinYang();
		objYinYang.setVisible(true);
	}
}

package com.gaurangjadia.code.java;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

public class YinYang extends JFrame {

private static final long serialVersionUID = 1L;

public YinYang(){

super("Yin-Yang Draw Application.");

this.setSize(500,500);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void paint(Graphics g){

super.paint(g);

int xCenter = getWidth() / 2;

int yCenter = getHeight() / 2;

int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4);

int x = xCenter - radius;

int y = yCenter - radius;

g.setColor(Color.white);

g.fillOval(x, y, 2 * radius, 2 * radius);

g.setColor(Color.black);

g.drawOval(x, y, 2 * radius, 2 * radius);

g.setColor(Color.black);

g.fillArc(x, y, 2 * radius, 2 * radius, 270, 180);

g.setColor(Color.white);

g.fillOval(x + (radius / 2), y, radius, radius);

g.setColor(Color.black);

g.fillOval(x + (radius / 2), y + radius, radius, radius);

g.setColor(Color.black);

g.fillOval(x + radius - (radius / 4), y + radius / 4, radius / 2, radius / 2);

g.setColor(Color.white);

g.fillOval(x + radius - (radius / 4), y + radius + radius / 4, radius / 2, radius / 2);

}

public static void main(String args[]) {

YinYang objYinYang = new YinYang();

objYinYang.setVisible(true);

}

Output

Here is the screenshot of output window.

October 7, 2013

How to serialize and deserialize Java object to and from a flat file?

Runner Class

package com.gaurangjadia.code.java;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Date;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.UIManager;

public class Runner extends JFrame implements ActionListener {

	private static final long serialVersionUID = 1L;
	
	public String strPath = "";

	private ObjectInputStream oisData;

	public Runner() {
		JFileChooser chooser = new JFileChooser();
	    chooser.setDialogTitle("Select Directory to Save File");
	    chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
	    chooser.setAcceptAllFileFilterUsed(false);
	    
		int intAction = chooser.showOpenDialog(this);
		
		if (intAction == JFileChooser.APPROVE_OPTION) {
			File f = chooser.getSelectedFile();
			strPath = f.getAbsolutePath();
			
			Example objExampleWrite = new Example("This is Awesome", "This is Great", new Date());
			
			try {
				//Write Object
				FileOutputStream fosData = new FileOutputStream(strPath + "//Example.data");
				ObjectOutputStream oosData = new ObjectOutputStream(fosData);
				oosData.writeObject(objExampleWrite);
				oosData.close();
				fosData.close();
				
				//Read Object
				FileInputStream fisData = new FileInputStream(strPath + "//Example.data"); 
				oisData = new ObjectInputStream(fisData); 
				Example objExampleRead = (Example) oisData.readObject();
				
				System.out.print(objExampleRead);
			}
			catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	    run(new Runner(), 250, 110);
	}

	public static void run(JFrame frame, int width, int height) {
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setSize(width, height);
	    frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent e) {
		System.out.println(e);
	}
}

package com.gaurangjadia.code.java;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.Date;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.UIManager;

public class Runner extends JFrame implements ActionListener {

private static final long serialVersionUID = 1L;

public String strPath = "";

private ObjectInputStream oisData;

public Runner() {

JFileChooser chooser = new JFileChooser();

chooser.setDialogTitle("Select Directory to Save File");

chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

chooser.setAcceptAllFileFilterUsed(false);

int intAction = chooser.showOpenDialog(this);

if (intAction == JFileChooser.APPROVE_OPTION) {

File f = chooser.getSelectedFile();

strPath = f.getAbsolutePath();

Example objExampleWrite = new Example("This is Awesome", "This is Great", new Date());

try {

//Write Object

FileOutputStream fosData = new FileOutputStream(strPath + "//Example.data");

ObjectOutputStream oosData = new ObjectOutputStream(fosData);

oosData.writeObject(objExampleWrite);

oosData.close();

fosData.close();

//Read Object

FileInputStream fisData = new FileInputStream(strPath + "//Example.data");

oisData = new ObjectInputStream(fisData);

Example objExampleRead = (Example) oisData.readObject();

System.out.print(objExampleRead);

}

catch (Exception e) {

e.printStackTrace();

}

public static void main(String[] args) {

try {

UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

} catch (Exception e) {

e.printStackTrace();

}

run(new Runner(), 250, 110);

}

public static void run(JFrame frame, int width, int height) {

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(width, height);

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

System.out.println(e);

}

Example Class to Serialize

package com.gaurangjadia.code.java;

import java.io.Serializable;
import java.util.Date;

public class Example implements Serializable {
	
	private static final long serialVersionUID = 1L;
	
	private String title;
	private String description;
	private Date date;

	public Example(String strTitle, String strDescription, Date dtDate) {
		this.setTitle(strTitle);
		this.setDescription(strDescription);
		this.setDate(dtDate);
	}
	
	@SuppressWarnings("deprecation")
	public String toString() {
		this.getDate();
		return this.getTitle() + " " + this.getDescription() + " " + this.getDate().getYear();
	}
	
	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}
}

package com.gaurangjadia.code.java;

import java.io.Serializable;

import java.util.Date;

public class Example implements Serializable {

private static final long serialVersionUID = 1L;

private String title;

private String description;

private Date date;

public Example(String strTitle, String strDescription, Date dtDate) {

this.setTitle(strTitle);

this.setDescription(strDescription);

this.setDate(dtDate);

}

@SuppressWarnings("deprecation")

public String toString() {

this.getDate();

return this.getTitle() + " " + this.getDescription() + " " + this.getDate().getYear();

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getDescription() {

return description;

}

public void setDescription(String description) {

this.description = description;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

June 5, 2011

Download Controller – JavaEE Servlet

Here is small piece of java code to generate binary stream which tells browser to save file as attachment. I believe that this code will help java beginners to understand HttpServletResponse of the Servlets.

package com.gaurangjadia.code.controllers;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Download extends HttpServlet {

	private static final long serialVersionUID = 1L;

    public Download() {
        super();
    }

	public void init(ServletConfig config) throws ServletException {

	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		try{
			String fileName = request.getParameter("name");
			String path = request.getSession().getServletContext().getRealPath("/WEB-INF/upload/");
			
			//strFileName: Name of the file which is being downloaded and which exist under /WEB-INF/upload/ path
			if(fileName.equals("strFileName")){
				path += "/" + fileName;

				File file = new File(path);
				Integer intFileLength = (int)(file.length() / 1024) + 1;

				response.setContentType(new MimetypesFileTypeMap().getContentType(file));
				response.setHeader("Content-Disposition", "attachment; filename=" + fileName);

				FileInputStream in = new FileInputStream(path);
				OutputStream out = response.getOutputStream();

				byte buf[] = new byte[intFileLength];
				int bytesRead = 0;

				while( (bytesRead = in.read(buf)) &gt; 0 ){
					out.write(buf, 0, bytesRead);
				}
				out.close();
				in.close();
			}
			else{
				request.getRequestDispatcher("/WEB-INF/download.jsp").forward(request, response);
			}
		}
		catch(Exception ex){
			request.getRequestDispatcher("/WEB-INF/download.jsp").forward(request, response);
		}
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}

package com.gaurangjadia.code.controllers;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Download extends HttpServlet {

private static final long serialVersionUID = 1L;

public Download() {

super();

}

public void init(ServletConfig config) throws ServletException {

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

try{

String fileName = request.getParameter("name");

String path = request.getSession().getServletContext().getRealPath("/WEB-INF/upload/");

//strFileName: Name of the file which is being downloaded and which exist under /WEB-INF/upload/ path

if(fileName.equals("strFileName")){

path += "/" + fileName;

File file = new File(path);

Integer intFileLength = (int)(file.length() / 1024) + 1;

response.setContentType(new MimetypesFileTypeMap().getContentType(file));

response.setHeader("Content-Disposition", "attachment; filename=" + fileName);

FileInputStream in = new FileInputStream(path);

OutputStream out = response.getOutputStream();

byte buf[] = new byte[intFileLength];

int bytesRead = 0;

while( (bytesRead = in.read(buf)) > 0 ){

out.write(buf, 0, bytesRead);

}

out.close();

in.close();

}

else{

request.getRequestDispatcher("/WEB-INF/download.jsp").forward(request, response);

}

catch(Exception ex){

request.getRequestDispatcher("/WEB-INF/download.jsp").forward(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

Gaurang Jadia

Nothing is permanent except change

Tag Archives: Java

Yin Yang Java Swing Program

Code

Output

How to serialize and deserialize Java object to and from a flat file?

Runner Class

Example Class to Serialize

Download Controller – JavaEE Servlet