The method actionPerformed needs to find out what button was clicked when it gets the event e. When discussing the class ButtonDemo in Display 12, we said that the method invocation e.getActionCommand() returns the string written on the button. It has many constructors like. Java Tip: Use the Method setActionCommand. I don't know, but I would suggest you to follow Mark's advice.

Java Tip: Use the Method setActionCommand When you click a button with your mouse, it fires an event e known as an action event.The event e normally goes to the method actionPerformed of the action listener(s) for that button. Similarly with the help of javax.swing.JTextfield allow us to add text fields to JFrame. First, you get the reflection Method object of a private or protected method with method = clazz.getDeclaredMethod() (clazz needs to be the Class object of th class that declares the method, not one of its subclasses (i.e. I have tried to explain JButton with suitable, easy and complete programming example. your coworkers to find and share information.

In such a case, you can distinguish the two buttons by using setActionCommand to give them different action commands.

How do I generate random integers within a specific range in Java?

Programming

Note that e.getActionCommand() is an object of the class String. Thus, the following code tests to see if e.getActionCommand() is equal to "Red" or "Green" and changes the color of the GUI accordingly: The final else clause should never need to be executed. Much of what appears in Display 12 is already familiar to you.

And the fireActionPerformed method was also already mentioned (see OscarRyz' answer), for avoiding potential concurrency problems.

You know, JButton is a fundamental Swing component that renders a button on screen and responds to user’s clicking event for performing a specific task. Why is macOS often referred to as 'Darwin'?

Other ways of displaying one-of-many choices are combo boxes and lists.

Notify me of follow-up comments by email. In this case it prints a message to the console. You would do so as follows: The method actionPerformed would then check for the string "Stop" rather than the string "Red". The class ButtonDemo is a derived class of the class JFrame and so it is a window interface similar to the ones we have already seen in this article. I am trying to do something to this effect using java swing. We use a layout manager as we did in the previous example (Display 10), although this time we use the FlowLayout manager class. JButton(Icon icon); creates a button with specified icon. You will be able to change the value that the Integer class is wrapping. In this subsection we tell you how to add buttons to your GUI. But buttonGui is the action listener for the buttons in buttonGui, so the action event goes to buttonGui. Why is Olympus Mons the largest volcano in the whole solar system? Algebraic independence of shifts of the Riemann zeta function.

An example should make the details clear.

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