什么调用 HelloWorldAnonymousClasses 中的 greet() 方法？答案

【问题标题】：What calls the greet() method in HelloWorldAnonymousClasses?什么调用 HelloWorldAnonymousClasses 中的 greet() 方法？
【发布时间】：2016-04-21 13:05:23
【问题描述】：

在 HelloWorldAnonymousClasses 示例程序 (from here) 中：

/*
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

public class HelloWorldAnonymousClasses {

    interface HelloWorld {
        public void greet();
        public void greetSomeone(String someone);
    }

    public void sayHello() {

        class EnglishGreeting implements HelloWorld {
            String name = "world";
            public void greet() {
                greetSomeone("world");
            }
            public void greetSomeone(String someone) {
                name = someone;
                System.out.println("Hello " + name);
            }
        }

        HelloWorld englishGreeting = new EnglishGreeting();

        HelloWorld frenchGreeting = new HelloWorld() {
            String name = "tout le monde";
            public void greet() {
                greetSomeone("tout le monde");
            }
            public void greetSomeone(String someone) {
                name = someone;
                System.out.println("Salut " + name);
            }
        };

        HelloWorld spanishGreeting = new HelloWorld() {
            String name = "mundo";
            public void greet() {
                greetSomeone("mundo");
            }
            public void greetSomeone(String someone) {
                name = someone;
                System.out.println("Hola, " + name);
            }
        };
        englishGreeting.greet();
        frenchGreeting.greetSomeone("Fred");
        spanishGreeting.greet();
    }

    public static void main(String... args) {
        HelloWorldAnonymousClasses myApp =
            new HelloWorldAnonymousClasses();
        myApp.sayHello();
    }            
}

什么调用englishGreeting 对象的greet() 方法？我很困惑..

编辑

感谢您的回复。我应该发现的！我试图解决另一个查询，即：

在示例程序中 https://gist.github.com/bernii/5697073

在代码中

this.wait.until(new ExpectedCondition<Boolean>() {
            public Boolean apply(WebDriver webDriver) {
                System.out.println("Searching ...");
                return webDriver.findElement(By.id("resultStats")) != null;
            }
});

什么调用匿名内部类中的 apply() 方法？

编辑

我现在在一个新问题中提出了我的第二个查询。

【问题讨论】：

提示：在该页面上找到englishGreeting.greet()。
它就在main方法之前：/

标签： java anonymous-inner-class local-class

【解决方案1】：

在下面显示的代码部分中，创建了三个 HelloWorld 接口实例：

    HelloWorld englishGreeting = new EnglishGreeting();         
    HelloWorld frenchGreeting = new HelloWorld() {
       //...
    };         
    HelloWorld spanishGreeting = new HelloWorld() {
       // ...
    };

在这些实例上调用了一些方法：

    englishGreeting.greet();
    frenchGreeting.greetSomeone("Fred");
    spanishGreeting.greet();

法语和西班牙语版本是使用匿名内部类创建的。英文版是根据本地类声明 (EnglishGreeting) 创建的。注意：你不会经常看到本地类声明，这是一个解释性的例子。

【讨论】：

【解决方案2】：

englishGreeting 对象的 greet() 方法在 SpanishGreeting 类之后调用

englishGreeting.greet();

更新： apply- 方法是从

调用的

WebDriverWait.until()

【讨论】：