Syntax for invoking multiple methods of an anonymous class in Java? [closed]

Question

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.

---

We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.

Closed 4 years ago.

Improve this question

Notification.Builder notificationBuilder = new Notification.Builder(
                        getApplicationContext())
                    .setTicker(tickerText)
                    .setSmallIcon(android.R.drawable.stat_sys_warning)
                    .setAutoCancel(true)
                    .setContentIntent(mContentIntent)
                    .setSound(soundURI)
                    .setVibrate(mVibratePattern)
                    .setContent(mContentView);

invokes multiple methods on the anonymous[--correction: it's NOT anonymous--] class. On each line it starts with .<method name>. Where is the official Java documentation on this? I'm hoping there is a page on http://docs.oracle.com/javase/ that explains it.

PS. I just learned this is called "method chaining". So where is the official Java documentation, if any, on this concept?

Answer 1

You ask:

So where is the official Java documentation, if any, on this concept?

If your method returns an object, you can call another method on the returned object, simple as that. All of the methods above return this, and so if method1, method2, and method3 all return this you can do this:

MyClass myVar = new MyClass().method1().method2().method3();

which is the same as:

MyClass myVar = new MyClass();
myVar.method1();
myVar.method2();
myVar.method3();

The documentation for Java method invocation can be found in the JLS Section 15.12.