A very short example to demonstrate that GWT SDK 2.5.1 still does not support Java 7 constructs, such as switch statements for String values: even though the file compiles fine, it gives error during run-time.

HelloWorldGWT.java

package com.manning.gwtia.ch02.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;

public class HelloWorld implements EntryPoint {

  @Override
  public void onModuleLoad() {
	Label theGreeting = new Label("Hello World!");
	RootPanel.get().add(theGreeting);
		
	String myString = "hello";
	
	switch(myString) {
	  case "hello":
	    System.out.println("hello");
	    break;
	  default:
	    System.out.println("default");
	    break;
	}
  }
}