hello.java

netbeans开发gwt程式的插件

/*
 * Copyright 2006 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.sample.hello.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * HelloWorld application.
 */
public class Hello implements EntryPoint {

    public void onModuleLoad() {
        Button b = new Button("Click me", new ClickListener() {

            public void onClick(Widget sender) {
                //Window.alert("Hello, AJAX");
                bar(new Hello(), "Message sent to the bar native method from Java method");
            }
        });

        RootPanel.get().add(b);
    }

    // Add native JavaScript code.
    public static native void myalert(String msg) /*-{
    $wnd.alert(msg);
    }-*/;
    
    // Instance and static fields which will be accessed from JavaScript code
    String myInstanceField = "Life is worth living with Passion!";
    static String myStaticField;

    // Instance method
    void instanceFoo(String s) {
        myalert(s);
    }

    // Static method
    static void staticFoo(String s) {
        myalert(s);
    }

    // Native method in which Java methods and fields are accessed from the
    // JavaScript code.
    //
    public native void bar(Hello x, String s) /*-{
    // Call instance method instanceFoo() on this
    [e-mail]::instanceFoo(Ljava/lang/String;)("The 1st " + s);
    // Call instance method instanceFoo() on x
    [e-mail]::instanceFoo(Ljava/lang/String;)("The 2nd " + s);
    // Call static method staticFoo()
    @com.google.gwt.sample.hello.client.Hello::staticFoo(Ljava/lang/String;)("The 3rd " + s);
    // Read instance field on this
    var val = [e-mail]::myInstanceField;
    @com.google.gwt.sample.hello.client.Hello::staticFoo(Ljava/lang/String;)("Instance field contains " + val);
    // Write instance field on x and read it again
    [e-mail]::myInstanceField = val + " Really!";
    var val2 = [e-mail]::myInstanceField;
    @com.google.gwt.sample.hello.client.Hello::staticFoo(Ljava/lang/String;)("Instance field contains " + val2);
    // Write static field (no qualifier) and read it again
    @com.google.gwt.sample.hello.client.Hello::myStaticField = "Message from static field";
    var val3 = @com.google.gwt.sample.hello.client.Hello::myStaticField;
    @com.google.gwt.sample.hello.client.Hello::staticFoo(Ljava/lang/String;)("Static field contains " + val3);
    }-*/;
}