jpnew JPanel 12 creates an array of 12 references to JPanels, but it doesn't create any JPanels, all the references are null, which is why you get the NPE on line 41. Taking the length of null as if it were an array. Answered by JamesCherrill 4,577 in a post from 8 Years Ago. Accessing or modifying the field of a null object. These include: Calling the instance method of a null object. Thrown when an application attempts to use null in a case where an object is required. D:SWING>javac comtutorialspointguiSwingLayoutDemo.java.
Go to D:/ > SWING and type the following command. Compile the program using the command prompt. Frame f new JFrame ('Combining Layouts') JPanel panel1 new JPanel () JPanel panel2 new JPanel () tLayout (new BoxLayout (panel1, BoxLayout.YAXIS)) tLayout (new FlowLayout ()) Then after adding. public class NullPointerException extends RuntimeException. Create the following Java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >.
#NULLPOINTEREXCEPTION JAVA NEW FLOWLAYOUT HOW TO#
Made a community management interface, when I added a monitoring event, run the "Exception in thread" AWT-EventQueue-0 "", specifically to the code sentence "BTN_UPActionPerformed (e), between Search online, mainly do not instantiate objects, and still unable to solve after the code is checked, and you can help you. How to combine FlowLayout and BoxLayout in Java To combine both the layouts, here we have created two panels. WindowConstants public class JFrame02 extends Frame How to deal with empty pointer exception "Exception in thread" AWT-EventQueue-0 "" package GUI import java.
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