Format decimal value into two decimal in swing

DecimalDemo.java

/**
 * Format decimal value into two decimal in swing
 * @author: Gayan Virajith
 * @url: webcreate.lk
 * @email: gayanvirajith@gmail.com / webcreatelk@gmail.com
 */

import javax.swing.JFrame;
import javax.swing.JLabel;
import java.text.DecimalFormat;

/**
 * DecimalDeom.java - 
 * Format decimal value into two decimal in swing
 */
class DecimalDemo extends JFrame{	

	/**
 	 * label - Label to hold decimal number
 	 */
	JLabel label;
	
	/**
 	 * salery - Decimal value of salery
 	 */
	double salery = 20000.9922343;

	/**
	 * Default constructor
	 *
	 * I used contructor to initialize the frame titles,size,close operation,etc.
	 * On this method you would see how format is going on...
	 *  
	 */
	public DecimalDemo() 
	{
		// Set frame title
		setTitle("Decimal Demo");

		// Set close operation
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		// A variable to hold salery in string format
		// getSaleryInFomrmatMethodOne() method will return string format of sallery.
		// You can use getSaleryInFomrmatMethodTwo() also.
		String saleryInText = getSaleryInFomrmatMethodOne();
		
		// Initilaize the label
		label = new JLabel(saleryInText);

		// Add lable into the panel
		getContentPane().add(label);
		
		// Set the size of the jframe
		setSize(200,200);

		// Finally show up
		setVisible(true);
	}

	/**
	 * getSaleryInFomrmatMethodOne() - format the decimal salery value into two decimals
	 * Used DateFormater class to format the deciamal value
	 * @return String - formatted salery
	 */ 
	public String getSaleryInFomrmatMethodOne() {		
		DecimalFormat df = new DecimalFormat("#.##");
		return df.format(salery);		
	}

	/**
 	 * getSaleryInFormatMethodTwo () - format the decimal salery value into two decimals
 	 * This time I used String.format() method
 	 * @return String - formatted salery
 	 */
	public String getSaleryInFormatMethodTwo() {
		return String.format("%.2f", salery);
	}

	/**
 	 * Main method
 	 */ 
	public static void main(String []args) 
	{
		// Create instance of the class, which would automatically rendered on your screen.
		new DecimalDemo();
	}
}

Decimal demo

Steps to compile & run:

Go to your terminal (Command prompt on windows). Make your javac is working.

Compile

javac DecimalDemo.java

Run

java DecimalDemo