How to Remove Title bar from JFrame of Java Application

To remove the title bar completely, there is a method called setUndecorated() in java. It takes a boolean variable. If the boolean is true, the title bar will be removed. The following one is an example. The method setUndecorated() invoked with a true boolean argument, will remove the title bar from the JFrame MyJFrame. The method is called here from the constructor. You may call it anywhere from within the class scope.

How to Close or Exit a Java App When some Button is Clicked

To close a Java app, System.exit() can be used. This function can be used to close the app if an error occurs or no error is occurred. If no, error occurred, the argument  of the function should be 0. This method terminates the currently running Java Virtual Machine. The argument stands for status code; by convention, a nonzero status code indicates abnormal termination. If you are calling the System.exit() function without any errors (in normal case), just give the argument as zero. This method calls the exit method in class Runtime.

How to Change Image in JButton in Java - Set Icon of JButton

In this post we are discussing how to change the image in button in Java. There may be situations in

Jbutton with Image set

programming where we want to know how to set JButton image in java or to change button icon in java. The java code to change the icon of a Jbutton is so short. We use the

setIcon()

method in JButton class. The setIcon method takes an ImageIcon object as an argument. I will show you a sample java code in which the icon of  button is set. First of all,  you have to copy the icon image (jpg, bmp, png or gif image) to the src folder in the project directory. You may also place it in some folder inside the src folder. If you are using netbeans IDE, you can simply drag and drop the image file into the desired folder in the projects pane. After copying the icon image to src folder (or any subfolder in it), use the following code to set it as the button's icon.

playbtn.setIcon(new ImageIcon(getClass().getResource("/manhaj/images/play.png")));