java-Anonymous Inner class

Anonymous inner class

1. Definition:

Implement an interface, or inherit a parent class, and return a good instance of new.

2. Syntax:

The implementation body of the new class name or interface name class

3. What is the use of anonymous internal classes:

Class is used immediately after it is created and is used only once

4. Note the point:

• Anonymous inner classes cannot have a constructor • Anonymous inner classes cannot define any static members, static methods. • Anonymous internal classes cannot be public,protected,private,static. • Only one instance of an anonymous inner class can be created. • An anonymous inner class must be behind new , implementing an interface with its implication or implementing a class. 5. Lifting chestnuts implement anonymous inner classes by inheriting:

1  PackageCom.han6.java;2 3  Public classFruit4 {5      Public voidsaysomething ()6     {7System.out.println ("I am fruit! ");8     }9     Ten      Public Static voidMain (string[] args) One     { AFruit Fruit =NewFruit () -         { - @Override the              Public voidsaysomething () { -System.out.println ("I am apple!"); -             } -              +         }; - fruit.saysomething (); +     } A  at}

Use anonymous inner classes by implementing an interface:

1  PackageCom.han6.java;2 3  Public classDemo4 {5      Public Static voidMain (string[] args)6     {7Person person =NewPerson ()8         {9 @OverrideTen              Public voidEat () One             { ASystem.out.println ("A person like to eat fruit!"); -             } -         }; the person.eat (); -     } -      - } +  - Interface Person + { A     voideat (); at}

6. Work use:

An anonymous inner class is used on a specific instance of = modifies some property methods of the class to which the instance belongs, and the modified content is only valid for this instance as a one-time class. Mainly used in the handling of a particular event.

java-Anonymous Inner class