Split string into array of character strings
This will produce array [“c”, “a”, “t”]
Java
Why cannot cast Integer to String in java?
Why this is not possible: Because String and Integer are not in the same Object hierarchy. The casting which you are trying, works only if they are in the same hierarchy, e.g. In this case, (A) objB or (Object) objB or (Object) objA will work. Hence as others have mentioned already, to convert an integer to string use: String.valueOf(integer), or Integer.toString(integer) for primitive, … Read more
how to convert .java file to a .class file
A .java file is the code file. A .class file is the compiled file. It’s not exactly “conversion” – it’s compilation. Suppose your file was called “herb.java”, you would write (in the command prompt): It will create a herb.class file in the current folder. It is “executable” only if it contains a static void main(String[]) method inside it. If it does, … Read more
what does x– or x++ do here?
x– will decrement value of x by 1. It is a postfix decrement operator, –x is a prefix decrement operator. So, what’s going on here? By analogy, the ++ will increase a value by 1. It also has a prefix and postfix variant.
How do I autoindent in Netbeans?
Open Tools -> Options -> Keymap, then look for the action called “Re-indent current line or selection” and set whatever shortcut you want.
android.content.res.Resources$NotFoundException: String resource ID #0x0
Change To There are different versions of setText – one takes a String and one takes an int resource id. If you pass it an integer it will try to look for the corresponding string resource id – which it can’t find, which is your error. I guess app.getTotalDl() returns an int. You need to specifically tell setText to set it … Read more
How do I use StringUtils in Java?
java.lang does not contain a class called StringUtils. Several third-party libs do, such as Apache Commons Lang or the Spring framework. Make sure you have the relevant jar in your project classpath and import the correct class.
Generate UML Class Diagram from Java Project
I use eUML2 plugin from Soyatec, under Eclipse and it works fine for the generation of UML giving the source code. This tool is useful up to Eclipse 4.4.x
What is object serialization?
Serialization is the conversion of an object to a series of bytes, so that the object can be easily saved to persistent storage or streamed across a communication link. The byte stream can then be deserialized – converted into a replica of the original object.
A JRE or JDK must be available in order to run Eclipse. No JVM was found after searching the following locations
You can explicitly tell Eclipse where to find it. Open eclipse.ini and add the following lines to the top of the file: Update: I just nailed down the root cause on my own Windows machine. The GlassFish installer complained with exactly the same error message and after digging in GlassFish forums, the cause was clear: a corrupt … Read more