Collections Frame work

[Laxmi Bhavisetti]

import java.util.*;

class HashMapDemo {
	public static void main(String args[]) {
		
		// create a  hash map
		HashMap<String, Double> hm = new HashMap<String, Double>();
		
		// put elements to the map
		hm.put("John Doe", new Double(3434.34));
		hm.put("Tom Smith", new Double(123.22));
		hm.put("Jane Baker", new Double(1378.00));
		hm.put("Tod Hall", new Double(99.22));
		hm.put("Ralph Smith", new Double(-19.08));		
		// Get a set of the entries
		Set<Map.Entry<String, Double>> set = hm.entrySet();		
		// Display the set
		for(Map.Entry<String, Double> me : set) {
			System.out.println(me.getKey() + ": ");
			System.out.println(me.getValue());		
		}		
		System.out.println();		
		// Deposit 1000 in to John doe's account
		double balance = hm.get("John Doe");
		hm.put("John Doe", balance + 1000);
		
		System.out.println("John Doe's new balance: " 
				+ hm.get("John Doe"));
	}
}

In the above program, when im trying to compile. The error im facing is Cannot find symbol ( Set<Map.Entry<String, Double>> set = hm.entrySet();
// Display the set
for(Map.Entry<String, Double> me : set):
Symbol is: class Entry
Location: class Map.

Can some one help me in this error.

[Campbell Ritchie]

Compiled and ran first time when I tried it.
What version of javac are you using?

[Jesper de Jong]

Do you maybe have a class that you wrote yourself that is called Entry or Map? It could be that the Java compiler is picking that up instead of the class Entry or Map from the package java.util.

Make sure that you remove any class named Entry or Map that you might have in your project.

[Laxmi Bhavisetti]

Hi Jesper,

Well i even tried to copy the program file on desktop and compile it. Its still showing the same error. Well Im working on different programs not on project. Learning java from complete reference to java book. As far i searched for class on those names, there are no programs specified with that name.

Hi campbell
The version of java im using is latest JRE 7

[Laxmi Bhavisetti]

Thank you jesper,
ive Got it. I took all my applications to other file and tried to execute this. IT worked thank you

[Campbell Ritchie]

You must have another class called Map.Entry or similar somewhere in your folder.

[Rob Spoor]

Only another class named Map. The error says it can find Map, but there's no nested class Entry inside Map.

[Campbell Ritchie]

Yes, you read the error message better than me.