get string value from HashMap depending on key name

collections, hashmap, java

Solution

Just use `Map#get(key)` ?

Object value = map.get(myCode);

Here's a tutorial about maps, you may find it useful: https://docs.oracle.com/javase/tutorial/collections/interfaces/map.html.

Edit: you edited your question with the following:

I'm expecting to see a String, such as "ABC" or "DEF" as that is what I put in there initially, but if I do a System.out.println() I get something like java.lang.string#F0454

Sorry, I'm not too familiar with maps as you can probably guess ;)

You're seeing the outcome of `Object#toString()`. But the `java.lang.String` should already have one implemented, unless you created a custom implementation with a lowercase `s` in the name: `java.lang.string`. If it is actually a custom object, then you need to override `Object#toString()` to get a "human readable string" whenever you do a `System.out.println()` or `toString()` on the desired object. For example:

@Override
public String toString() {
    return "This is Object X with a property value " + value;
}

Problem

I have a `HashMap` with various keys and values, how can I get one value out? I have a key in the map called `my_code`, it should contain a string, how can I just get that without having to iterate through the map? So far I've got.. ``` HashMap newMap = new HashMap(paramMap); String s = newMap.get("my_code").toString(); ``` I'm expecting to see a `String`, such as "ABC" or "DEF" as that is what I put in there initially, but if I do a `System.out.println()` I get something like `java.lang.string#F0454` Sorry, I'm not too familiar with maps as you can probably guess ;)

Original source