Anonymous inner class summary in Java

In the Java world, an anonymous inner class syntax sugar is provided to help you simplify your code, and this article briefly describes its common patterns in code from interfaces, abstract classes, and general classes.

1. Interface mode

 Public Interface iwriter {    void  write ();}  Public Static void Main (string[] args) {        new  iwriter () {            @Override            public void write () {                System.out.println ("Iwriter write ...");}        ;        Writer.write ();}

2. Abstract class

 Public Abstract classAbstractwriter { Public Abstract voidwrite ();}  Public Static voidMain (string[] args) {abstractwriter abstractwriter=NewAbstractwriter () {@Override Public voidwrite () {System.out.println ("Abstractwriter Write ...");        }        }; Abstractwriter.write ();}

3. General Class

 Public classTextWriterImplementsIwriter {@Override Public voidwrite () {System.out.print ("Text writer ..."); }} Public Static voidMain (string[] args) {TextWriter TextWriter=NewTextWriter () {@Override Public voidwrite () {System.out.println ("TextWriter 2 Write ...");    }    }; Textwriter.write ();}

4. Using in the thread

 Public Static void Main (string[] args) {    new  Thread () {        @Override        publicvoid  Run () {            new  iwriter () {                @Override                public  void  Write () {                    System.out.println ("Iwriter thread write ...");}            . Write ();        }    };    Thread.run ();}

5. Conclusion

As can be seen, in fact, regardless of the interface, abstract class, or general class derived from the anonymous inner class, its usage is the same. The reason is that this is a syntactic sugar, the essence of the compiler at the time of compilation, the anonymous internal class is compiled separately into a different class, this and a separate write implementation class and then call the actual nature is the same, specifically, you can see the compilation of the directory. As shown below:

Anonymous inner class summary in Java