Interface Code:problem:need to resolve it

[Deepak Lal]

Hi Ranchers,
I have the below Java code.

interface A{
    public void print();
}
public class TestInterface{
   A a;
   private String h = "Hello";
   a = new A(){
   public void print(){
       final String s;
	   s = h + " World";
	   System.out.println("The String is ::"+s);
   }};
   public static void main(String[] args){
	  TestInterface t = new TestInterface();
	  t.a.print();
   }	
}

Im compiling this program as below and getting the error as shown below.
why am i getting the below error <identifier> expected.

C:\j2sdk\jdk1.5.0_17\java\java>javac TestInterface.java
TestInterface.java:7: <identifier> expected
   a = new A(){
     ^
1 error

C:\j2sdk\jdk1.5.0_17\java\java>

Please guide me /suggest me whats wrong with the above piece of code.

Help provided will be highly appreciated.

--
Deepak Lal

[Ankit Garg]

You are trying to initialize a field in the class body. This is not allowed in a separate statement. Either move it with the declaration or move it into an initializer block

interface A{
    public void print();
}
public class TestInterface{
   A a;
   private String h = "Hello";
   {   //initializer block
      a = new A(){
      public void print(){
          final String s;
   	   s = h + " World";
   	   System.out.println("The String is ::"+s);
      }};
   }
   public static void main(String[] args){
	  TestInterface t = new TestInterface();
	  t.a.print();
   }	
}

[Rob Spoor]

This has nothing to do with the interface. The problem is that you are trying to put statements outside of a method or (static) initializer.

Remember, all a class can contain are declarations (fields, constructors, methods, inner classes / interfaces / enums) and (static) initializer blocks. Any regular code does not belong there.

You can quite easily fix your code by combining the declaration and statement into one:

interface A
{
    public void print();   
}

public class TestInterface
{
    A a = new A()
    {
        public void print()
        {
            final String s = h + " World";
            System.out.println("The String is ::"+s);
        }
    };

    private String h = "Hello";   

    public static void main(String[] args)
    {
        TestInterface t = new TestInterface();   
        t.a.print();   
    }
}

[Deepak Lal]

Thanks for your valuable input and efforts for fixing this piece of code.
Thanks Ankit and Rob.



--
Deepak Lal