Check the eclipse.ini file and make sure there is no -vm option there that is pointing to a non existing java install now. You can delete the option to let Eclipse figure out what java install to use or change it so it’s pointing to the new install.
You have not defined a method around your code. In this case, I have assumed that you want your code to be executed in the main method of the class. It is, of course, possible that this code goes in any other method.
Pass true as a second argument to FileWriter to turn on “append” mode. FileWriter usage reference
If you, like me, would rather use some library code where they probably have thought of all special cases, such as what happens if you pass in null or dots in the path but not in the filename, you can use the following:
It doesn’t work because you didn’t attach the ScrollPane to the JFrame. Also, you don’t need 2 JScrollPanes:
This will produce array [“c”, “a”, “t”]
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
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
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.
Open Tools -> Options -> Keymap, then look for the action called “Re-indent current line or selection” and set whatever shortcut you want.