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 …

As you should know, Java types are divided into primitive types (boolean, int, etc.) and reference types. Reference types in Java allow you to use the special value null which is the Java way of saying "no …

Java will not give a default value to a local variable, even if it gives default values to class variables and instance variables. Section 4.12.5 of the JLS covers this:

Apr 4, 2017 · It means that it "Reached the end of file while parsing", i.e. the parsing is incomplete, but there is no more text to parse. Example: Expression a * (2 + b is incomplete, because it's missing a ). …

Aug 7, 2013 · A common problem that new Java developers experience is that their programs fail to run with the error message: Could not find or load main class ... What does this ...

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 …

I am trying to write a program, but I'm getting this compiler error: Main.java:1: error: class WeatherArray is public, should be declared in a file named WeatherArray.java public class WeatherArra...

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 …