CODEWITHSUNDEEP
javaarraylist
Sherwood Lee
Sherwood Lee

Reputation: 237

arraylist initialization error

I have a problem with initializing ArrayLists.

When I used NetBeans 7.3 I tried to do this: 

protected Stack<Scope> scopeStack;
protected ArrayList<Scope> allScopes;
scopeStack = new Stack<>();
allScopes = new ArrayList<>();

the file is perfectly compiled and goes fine.

But when I switch to linux using command line to compile java. It gives me an error

src/SymbolTable.java:28: illegal start of type scopeStack = new Stack<>();      
SymbololTable.java:29: illegal start of type allScopes = new ArrayList<>();

Is this cause by different versions of java compiler? Or what's the reason that cause this?

Upvotes: 3

Views: 10793

Answers (3)

BlackHatSamurai
BlackHatSamurai

Reputation: 23483

You need to define the type when you initialize if you are using Java 6, like so:

scopeStack = new Stack<Scope>();
allScopes = new ArrayList<Scope>();

Upvotes: 2

Boris the Spider
Boris the Spider

Reputation: 61148

I would conjecture that in Netbeans you are using Java 1.7 and on Linux you are using Java 1.6.

The "diamond operator" was only introduced in Java 7.

Use javac -version to see what version of the compiler your a running.

Upvotes: 10

Jon Newmuis
Jon Newmuis

Reputation: 26502

You should specify the type of your collection in your new call, and initialize the fields in the proper place. Try either:

Initializing the fields inline

protected Stack<Scope> scopeStack = new Stack<Scope>();
protected ArrayList<Scope> allScopes = new ArrayList<Scope>();

Initializing the fields in a constructor

public class MyClass {
  protected Stack<Scope> scopeStack;
  protected ArrayList<Scope> allScopes;

  public MyClass() {
    scopeStack = new Stack<Scope>();
    allScopes = new ArrayList<Scope>();
  }
}

Upvotes: 0

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