GWT:How to access java variable from JSNI

Question

I have this method:

public void testJSNI2(){
  String x = "test";
}

I can access this method like this:

[email protected]::testJSNI2(Ljava/lang/String;)

But how can I access the String x, which is defined inside a method?

Answer 1

The answer is not correct. JavaScript and Java dose not act the same. Person can access any field from js with the help of JSNI:

public class JSNIExample {

  String myInstanceField;
  static int myStaticField;

  void instanceFoo(String s) {
    // use s
  }

  static void staticFoo(String s) {
    // use s
  }

  public native void bar(JSNIExample x, String s) /*-{
    // Call instance method instanceFoo() on this
    [email protected]::instanceFoo(Ljava/lang/String;)(s);

    // Call instance method instanceFoo() on x
    [email protected]::instanceFoo(Ljava/lang/String;)(s);

    // Call static method staticFoo()
    @com.google.gwt.examples.JSNIExample::staticFoo(Ljava/lang/String;)(s);

    // Read instance field on this
    var val = [email protected]::myInstanceField;

    // Write instance field on x
    [email protected]::myInstanceField = val + " and stuff";

    // Read static field (no qualifier)
    @com.google.gwt.examples.JSNIExample::myStaticField = val + " and stuff";
  }-*/;

}

You can see this here: http://www.gwtproject.org/doc/latest/DevGuideCodingBasicsJSNI.html

Answer 2

You can't access the variable x because it is in the scope of the method, the same way you wouldn't be able to access it in Java code.