ive been having this problem for 2 days already.. ive been surfing the net and reading books but with no prevail i still dont know or any idea what to do with this problem.. what am i doing wrong? ive been having a NullPointerException pointing to here : setup.setImage(Toolkit.getDefaultToolkit().getImage("mpix/rmstudio.gif") ); setup is an instance of my JFrame with an attribute of Image so i could draw the image on my jframe.. this line -> setup.setImage(Toolkit.getDefaultToolkit().getImage("mpix/rmstudio.gif") ); is located on another class called Tools.. then calling setup.repaint()..i wanted to insert the image on the jframe by clicking on a jbutton ( which has the setup.setImage(Toolkit.getDefaultToolkit().getImage("mpix/rmstudio.gif") ); .. is the problem really pointing here?
An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts.
Introduce Scanner class:
Viewers will learn one way to get user input in Java.
Introduce the Scanner object:
Declare the variable that stores the user input:
An example prompting the user for input:
Methods you need to invoke in order to properly get user input: