Hashmap in Java Eclipse

[Anai Anderson]

I am trying to complete the printAreaCode method on this program. I have to get the PhoneNumber object from the map and then get the area code from the PhoneNumber. Then the if statement can compare an area code to an area code.

package HashMap;

import java.util.HashMap;

public class PhoneBook {
	HashMap<String, PhoneNumber> pb = new HashMap<String, PhoneNumber>();
	public static void main(String[] args) {
		PhoneBook pb = new PhoneBook();
		pb.addEntry("Frodo Baggins", "718-912-0807");
		pb.addEntry("Bilbo Baggins", "303-476-3907");
		pb.addEntry("Samwise Gamgee", "718-087-9136");
		pb.addEntry("Peregrin Took", "718-555-1234");
		pb.addEntry("Meriadoc Brandybuck", "442-967-1313");
		pb.printListings();
		System.out.println("\nBilbo: " +pb.lookUp("Bilbo Baggins"));
		System.out.println("\nHobbits in 718:");
		pb.printAreaCode("718");
	}
	
	public void addEntry(String name, String pnum) {
		PhoneNumber phonum = new PhoneNumber(pnum);
		pb.put(name, phonum);
	}
	public PhoneNumber lookUp(String name) {
		return pb.get(name);
	}
	public void printListings() {
		for(PhoneNumber p : pb.values()) {
			System.out.println(p);
		}
	}
	public void printAreaCode(String areaCode) {
		for(String s: pb.keySet()) {
			PhoneNumber phonenumber = pb.getValue();
			if(phonenumber.getAreaCode().equals(areaCode))
				System.out.println(s);
		}
	}
}

[Carey Brown]

What's the code for PhoneNumber?

[Anai Anderson]

The code for PhoneNumber is supposed to be underneath the "for" statement

[Carey Brown]

You didn't post the code for the PhoneNumber class and you didn't say where you were stuck. Does this help?

      public void printAreaCode(String areaCode) {
          for( Map.Entry<String,PhoneNumber> e : pb.entrySet()) {
        	  String name = e.getKey();
              PhoneNumber phonenumber = e.getValue();
              if(phonenumber.getAreaCode().equals(areaCode))
                  System.out.println( name + ", " + phonenumber );
          }
      }

[Anai Anderson]

ok it works now; Thank you so much for responding and for your help!  

[Campbell Ritchie]

Welcome to the Ranch

[Tim Holloway]

Welcome to the Ranch!

But there really isn't such a thing as "Java Eclipse". Java is a programming language, Eclipse is a software development application. The code you create in Eclipse is the same code you'd create in Intellij. Or Netbeans. Or Windows Notepad.

[Rob Spoor]

I don't fully agree. While most people associate Eclipse with Java development, it comes in a variety of packages: https://www.eclipse.org/downloads/packages/. For instance, there's Eclipse for C/C++ and Eclipse for PHP. Technically you can use those for Java programming, but you'll probably miss a lot of tools etc. Eclipse possibly isn't even capable of compiling the code.

[Tim Holloway]

Rob Spoor wrote:I don't fully agree. While most people associate Eclipse with Java development, it comes in a variety of packages: https://www.eclipse.org/downloads/packages/. For instance, there's Eclipse for C/C++ and Eclipse for PHP. Technically you can use those for Java programming, but you'll probably miss a lot of tools etc. Eclipse possibly isn't even capable of compiling the code.

The point here, however is that A) the question wasn't about "Eclipse Java", but "Java Eclipse". B) Eclipse never even factored in to the actual question.

Please realize that my self-assigned duty here at the Ranch is to be nit-picky about things as a reminder that computers are the ultimate nit-pickers and that careless use of terminology can lead to misconceptions and error.

I'm certainly not the one to be told about the multi-faceted nature of Eclipse. I've used it as an IDE for Python, Javascript, shell scripting, C/C++ and Arduino development and I think once even COBOL. It''s one of the reasons it's my preferred IDE.