Error: class, interface, or enum expected public boolean isNull()

Question

Problem:

I just started to learn java programming and I am very noob a it. I wrote a code which shows me error

Main.java:1: error: class, interface, or enum expected
{ 
^
Main.java:3: error: class, interface, or enum expected
    public String getName()  
           ^
Main.java:6: error: class, interface, or enum expected
    } 
    ^
Main.java:9: error: class, interface, or enum expected
    public boolean isNull()  
           ^
Main.java:12: error: class, interface, or enum expected
    } 
    ^
5 errors

The code I wrote is:

{ 
   
    public String getName()  
    { 
        return "Not Available"; 
    } 
  
   
    public boolean isNull()  
    { 
        return true; 
    } 
} 


   public class main {
        
     public static void main (String [] args){
       
       system.out.println(emp1.getname());

}

}

Please help me out to solve this problem.

Answer 1

A null object refers to an object without any reference or an object defined with neutral/null functionality/behavior. These null objects need to be checked to ensure that they are not null while accessing any member or invoking any methods

abstract class Emp 
{ 
    protected String name; 
    public abstract boolean isNull(); 
    public abstract String getName(); 
}

class NoClient extends Emp 
{ 
    @Override
    public String getName()  
    { 
        return "Not Available"; 
    } 
  
    @Override
    public boolean isNull()  
    { 
        return true; 
    } 
}

class EmpData {
public static final String [] names = {"fff"}
public static Emp getClint(String name)

{ 
        for (int i = 0; i < names.length; i++)  
        { 
            if (names[i].equalsIgnoreCase(name)) 
            { 
                return new Coder(name); 
            } 
        } 
        return new NoClient(); 
    } 
} 

}

public class Main {

     public static void main(String[] args)
{
     Emp emp1 = EmpData.getClient("fff"); 
     Emp emp2 = EmpData.getClient("xxx");

     System.out.println(emp1.getName()); 
      System.out.println(emp2.getName());       

}

}

Hope you understad this.

Happy coding.