Java Progress Bar

Progress Bar is an horizontal or vertical bar that visualize the progress of an operation. The class that is used to render the progress bar is 'JProgressBar' that is the part of the Java Swing package. It displays the progress of specific task by filling of the bar and/or displaying the percentage of completion. It may even display the text as specified. As the task reaches its completion, the progress bar fills up.

1. Creating a horizontal progress bar

ProgressBar.java

// Importing the 'awt' and 'swing' package that contains
// useful classes for Java Progress Bar
import java.awt.* ;
import javax.swing.* ;
import java.awt.event.* ;
// JFrame class is a container type which inherits the 
// java.awt.Frame class. It acts as the main window 
// containing components like labels, buttons, progress bars
// to create a Graphical User Interface.
public class ProgressBar extends JFrame {
 
    // instantiating the frame
    static JFrame f ;
    // instantiating the JProgressBar class used to display 
    // the progress of the task.
    static JProgressBar b ;
 
    public static void main( String[ ] args )
    {
        // creating a frame using the JFrame Constructor
        f = new JFrame( " Progress Bar " ) ;
 
        // creating a panel using the JPanel class. It provides 
        // space in which an application can attach any other component.
        JPanel p = new JPanel( ) ;
 
        // creating a progress bar using JProgressBar constructor
        b = new JProgressBar( ) ;
 
        // setting the initial value to 0
        b.setValue( 0 ) ;
       // setting StringPainted to true to make the progress bar 
       // render a string
        b.setStringPainted( true ) ;
 
        // add a progressbar using add( ) function
        p.add( b ) ;
 
        // add a panel using add( ) function 
        f.add( p ) ;
 
        // set the size of the frame
        f.setSize( 500, 500 ) ;
        f.setVisible( true ) ;
       // calling the fill( ) method
        fill( ) ;
    }
 
    // function to dynamically increase progress
    public static void fill( )
    {
        int i = 0 ;
        try {
            while ( i <= 100 ) {
                // fill the menu bar to the defined value using 
                // the setValue( ) method
                b.setValue( i + 5 ) ;
 
                // delay the thread by 1000 ms
                Thread.sleep( 1000 ) ;
                // increasing the progress every time by 10%
                i += 10 ;
            }
        }
        catch ( Exception e ) {
          System.out.println( e ) ;  
      }
    }
}

Output:

2. Program to create a vertical progress bar

ProgressBar1.java

// Importing the 'awt' and 'swing' package that contains
// useful classes for Java Progress Bar
import java.awt.* ;
import javax.swing.* ;
import java.awt.event.* ;

// JFrame class is a container type which inherits the 
// java.awt.Frame class. It acts as the main window 
// containing components like labels, buttons, progress bars
// to create a Graphical User Interface.
public class ProgressBar1 extends JFrame {

    // instantiating the frame
    static JFrame f ;
 
    // instantiating the JProgressBar class used to display 
    // the progress of the task.
    static JProgressBar b ;
 
    public static void main( String[ ] args )
    {
 
        // creating a frame using the JFrame Constructor
        f = new JFrame( " Progress Bar " ) ;
 
        // creating a panel using the JPanel class. It provides 
        // space in which an application can attach any other component.
        JPanel p = new JPanel( ) ;
 
        // creating a progress bar using JProgressBar constructor and 
        // setting the value to vertical for vertical progress bar
        b = new JProgressBar( SwingConstants.VERTICAL ) ;
 
        // setting the initial value to 0
        b.setValue( 0 ) ;
 
        // setting StringPainted to true to make the progress bar 
        // render a string
        b.setStringPainted( true ) ;
 
        // add a progressbar using add( ) function
        p.add( b ) ;
 
        // add a panel using add( ) function 
        f.add( p ) ;
 
        // set the size of the frame
        f.setSize( 500, 500 ) ;
        f.setVisible( true ) ;
 
        // calling the fill( ) method
        fill( ) ;
    }
 
    // function to dynamically increase progress
    public static void fill( )
    {
        int i = 0 ;
        try {
            while ( i <= 100 ) {
                // fill the menu bar to the defined value using 
                // the setValue( ) method
                b.setValue( i + 10 ) ;
 
                // delay the thread by 1000 ms
                Thread.sleep( 1000 ) ;

                // increasing the progress every time by 10%
                i += 10 ;
            }
        }
        catch ( Exception e ) {
            System.out.println( e ) ;
        }
    }
}

Output:

3. Program to set specific string to Progress Bar

ProgressBar3.java

// Importing the 'awt' and 'swing' package that contains
// useful classes for Java Progress Bar
import java.awt.* ;
import javax.swing.* ;
import java.awt.event.* ;

// JFrame class is a container type which inherits the 
// java.awt.Frame class. It acts as the main window 
// containing components like labels, buttons, progress bars
// to create a Graphical User Interface.
public class ProgressBar3 extends JFrame {
 
    // instantiating the frame
    static JFrame f ;
 
    // instantiating the JProgressBar class used to display 
    // the progress of the task.
    static JProgressBar b ;
 
    public static void main( String[ ] args )
    {
 
        // creating a frame using the JFrame Constructor
        f = new JFrame( " Progress Bar " ) ;
 
        // creating a panel using the JPanel class. It provides 
        // space in which an application can attach any other component.
        JPanel p = new JPanel( ) ;
 
        // creating a progress bar using JProgressBar constructor and 
        // setting the value to vertical for vertical progress bar
        b = new JProgressBar( ) ;
 
        // setting the initial value to 0
        b.setValue( 0 ) ;
 
        // setting StringPainted to true to make the progress bar 
        // render a string
        b.setStringPainted( true ) ;
 
        // add a progressbar using add( ) function
        p.add( b ) ;
 
        // add a panel using add( ) function 
        f.add( p ) ;
 
        // set the size of the frame
        f.setSize( 500, 500 ) ;
        f.setVisible( true ) ;
 
        // calling the fill( ) method
        fill( ) ;
    }
 
    // function to dynamically increase progress
    public static void fill( )
    {
        int i = 0 ;
        try {
            while ( i <= 100 ) {
                // setting the text based on the level to which the bas is filled
                if ( i > 20 && i < 40 )
                    b.setString( " Began Loading " ) ;
                else if ( i > 60 && i < 80 )
                    b.setString( " Almost Loaded " ) ;
                else if( i > 80 )
                    b.setString( " About to complete " ) ;
                else
                    b.setString( " Loading in Progress " ) ;
 
                // fill the menu bar to the defined value using 
                // the setValue( ) method
                b.setValue( i + 10 ) ;
 
                // delay the thread by 1000 ms
                Thread.sleep( 3000 ) ;
                
                // increasing the progress every time by 10%
                i += 10 ;
            }
        }
        catch ( Exception e ) {
	System.out.println( e ) ;
        }
    }
}

Output 1:

Output 2:

Output 3:

Constructors of the JProgressBar Class

JProgressBar( ) : Creates a default horizontal progress bar with no text on it. It sets a minimum and initial value of 0 and a maximum of 100.
JProgressBar(int orientation) : Creates a progress bar with a specified orientation, that is vertical or horizontal bar. If 'SwingConstants.VERTICAL' is passed as anzargument to this method, a vertical progress bar is created and if 'SwingConstants.HORIZONTAL' is passed as an argument a horizontal progress bar is created.
JProgressBar(int min, int max) : Creates a progress bar with specified minimum and maximum value.
JProgressBar(int orientation, int min, int max) : Creates a progress bar with the specified minimum and maximum value and orientation. A vertical progress bar is created when SwingConstants.VERTICAL is passed as an argument, and a horizontal progress bar is created if SwingConstants.HORIZONTAL is passed as an argument.

Methods of the JProgressBar Class

int getMaximum( ) : Returns the maximum value of the progress bar.
int getMinimum( ) : Returns the minimum value of the progress bar.
String getString( ) : Gets the string representation of the current value of the progress bar.
void setMaximum(int n) : Sets the maximum value of the progress bar to the value n.
void setMinimum(int n) : Sets the minimum value of the progress bar to the value n.
void setValue(int n) : Sets the current value of the progress bar to the value n.
void setString(String s) : Sets the value of the progress String to the String s.
setStringPainted(Boolean b) : The 'stringPainted' property determines whether the progress bar should render a progress string. The default value is false, meaning no string is painted. We can set the value to true or false.