What if arr.length is 0? The for loop will not be run at all. Hence, the compiler will give variable a might not have been initialized to point out the potential danger and require you to initialize the variable. To …

Another example of this is when you use (Java 9+) java SomeClass.java to compile and run a class. If the class depends on another class that you haven't compiled (or recompiled), you are liable to get …

Aug 9, 2013 · I am trying to understand the Error class in Java. I have a good understanding of the Exception class, but can't find examples of code for the Error class. I've tried ...

If a reference variable is set to null either explicitly by you or through Java automatically, and you attempt to dereference it you get a NullPointerException. The NullPointerException (NPE) typically …

On Windows 10 I had just installed the JDK, and got these errors when checking the version. I had to delete all executable files starting with java (i.e. java.exe, javaw.exe and javaws.exe) from …

I'm basically refining, completing and trying to compile a test code from a reference book for java beginners. The objective is to create a guessing game wherein the target is located in 3 continuous

Apr 30, 2012 · CalculatorWithMemory.java:1: class Calculator is public, should be declared in a file named Calculator.java public class Calculator So my thought was that this means that I have to save …

Exception in thread thread_name: java.lang.OutOfMemoryError: Java heap space The detail message Java heap space indicates object could not be allocated in the Java heap.

I am getting a NoClassDefFoundError when I run my Java application. What is typically the cause of this?

Nov 19, 2014 · C:\ProgramData\Oracle\Java\javapath is added to the Path environment variable, causing Eclipse to run using the wrong java version. To fix the problem: 1) Right-click on Computer …