Thread: HashMap

When learning HashMaps in C++ I had to create the whole algorithm. In the code I created I could simply place a string into the method and it would store the names for me by turning the string into a integer and storing is accordingly. If there was a collision it would grow linearly at that location.

//play with Hash Tables
	void getNames(String names)
	{
		HashMap<String, Integer> map = new HashMap<String, Integer>();
 
		map.put(names,22);
	}

How can I do this in Java. I read about them and look at examples and they all for the most part look like this.

I was wondering if I was over looking something and there was a way to just simply send in a name and place it in a hashTable. Perhaps send in a Node and index it by a string value inside of it.

I dont understand the question either. What exactly do you want to do and which part of it is the problem?

I think this answered my question. Fired at the hip at this one.

//play with Hash Tables
	void setNames(Node node)
	{
		HashMap<Node, Integer> map = new HashMap<Node, Integer>(22);
 
		map.put(node,Integer.parseInt(node.name));
	}
 
	class Node
	{
		String name;
		String age;
	}

--- Update ---

Is it possible what I am trying to do, I don't understand why it would not accept the index of a string as the key to the bucket.

 
private HashMap< Integer,String> map = new HashMap<Integer,String>(22);
 
//play with Hash Tables
	void setName(String name)
	{
		map.put(Integer.parseInt(name),name);
	}
 
	String findName(String name)
	{
 
		String n = map.get(name);
 
		return n;
	}
 
 
	public static void main(String[] args)
	{
		TestButton test = new TestButton();
 
		test.setName("drew");
		test.setName("Mike");
		test.setName("SOA");
 
		String name = test.findName("drew");
 
		System.out.println(name);
 
	}

Error

Exception in thread "main" java.lang.NumberFormatException: For input string: "drew"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:492)
	at java.lang.Integer.parseInt(Integer.java:527)
	at testButtonsLoop.TestButton.setName(TestButton.java:72)
	at testButtonsLoop.TestButton.main(TestButton.java:89)

What exactly would get from that? Why would you want to map a string to itself?