java 抽象 接口

  
    

   
     package edu.javase.buffer;


   
     abstract
   
      
   
     class
   
      abs {
 
   
     abstract
   
      
   
     void
   
      fun1();
   
     //
   
      抽象方法
   
     

   
     
 
   
     abstract
   
      
   
     void
   
      fun2();

 
   
     public
   
      
   
     void
   
      method() {
 System.
   
     out
   
     .println(
   
     "
   
     in abstract using
   
     "
   
     );
 }

 
   
     public
   
      
   
     void
   
      method2() {
 System.
   
     out
   
     .println(
   
     "
   
     class abs method2 ...
   
     "
   
     );
 }
}


   
     interface
   
      face1 {
 
   
     public
   
      
   
     void
   
      facefun1();
}


   
     interface
   
      face2 {
 
   
     public
   
      
   
     void
   
      facefun2();
}


   
     public
   
      
   
     class
   
      abstractdemo extends abs implements face1, face2 {
 
   
     public
   
      
   
     static
   
      
   
     void
   
      main(String[] args) {
 abstractdemo a 
   
     =
   
      
   
     new
   
      abstractdemo();
 a.fun1(); 
   
     //
   
      抽象实现
   
     

   
      a.facefun1();
   
     //
   
      接口实现
   
     

   
     
 a.method();
   
     //
   
      抽象实现方法
   
     

   
      a.method2();
   
     //
   
      抽象实现方法
   
     

   
      }

 
   
     //
   
      重写抽象实现方法
   
     

   
      
   
     public
   
      
   
     void
   
      method2() {
 System.
   
     out
   
     .println(
   
     "
   
     class abstractdemo method2 ...
   
     "
   
     );
 }

 
   
     //
   
      必须实现抽象方法
   
     

   
      @Override
 
   
     void
   
      fun1() {
 System.
   
     out
   
     .println(
   
     "
   
     fun1
   
     "
   
     );

 }

 @Override
 
   
     void
   
      fun2() {
 System.
   
     out
   
     .println(
   
     "
   
     fun2
   
     "
   
     );
 }

 
   
     //
   
      必须实现接口方法
   
     

   
      @Override
 
   
     public
   
      
   
     void
   
      facefun1() {
 System.
   
     out
   
     .println(
   
     "
   
     facefun1
   
     "
   
     );

 }

 @Override
 
   
     public
   
      
   
     void
   
      facefun2() {
 System.
   
     out
   
     .println(
   
     "
   
     facefun2
   
     "
   
     );
 }

}
   
     /*
   
     
 * output:
fun1
facefun1
in abstract using
class abs method2 ...
 
   
     *///
   
      :~