Question

My problem is I have a HashMap where the key is an object and I need it to be one of the variables in said object. Currently, the HashMap.get() only looks at the myNums Objects but I need a way to get the value of num1 as thats the “real key”. I can’t use the myNums.get() methods because I don’t have an instantiation of myNums. I coud loop through each item in the HashMap to check but I’d prefer not to do that. Is there a more elegant solution?

What I have:

public static void main(String [] args){
   int [] array = {//integers 1-100};
   HashMap < myNums, String > hash = //data from another source;
   for(int i = 0;i < array.length; i++){
       if(hash.get(i) != null)
          OtherFunction(hash.get(i));         
   }
}

public class myNums{
   private int num1;
   private int num2;
   //get and set functions...
}

Answer 1

Maybe an entry iteration serves more your purpose:

for (Entry<MyNums, String> entry : map.entrySet()) {
    System.out.println("Key:" + entry.getKey());
    System.out.println("Value:" + entry.getValue());
}

With this iteration style you don’t have to invoke get all the time.