put « HashMap « Java Collection Q&A

1. If construct in hashmap.put call    stackoverflow.com

I have a variable of type Hashmap<String,Integer>. In this, the Integer value might have to go some manipulation depending upon the value of a flag variable. I did it like this...

Hashmapvariable.put( somestring,
 ...

2. strange HashMap.put() behaviour    stackoverflow.com

I am attempting to troubleshoot an intermittent failure that appears to be related to removing an object from a HashMap and then putting that same object back using a new key. ...

3. HashMap gets over written every time I use .put()    stackoverflow.com

My application is related to the stock market. I have a feed that is consistently updating an object called Price. Price has a HashMap that stores the security code (String) and ...

4. What is wrong with this Java code? Why can't I put in HashMap?    stackoverflow.com

class{
    public HashMap<String, String> eachperson;  

    apple(){
        this.eachperson.put("thekey","thevalue");
    }
}

5. Is it faster to use a switch statement vs an if statement, or put the cases inside a hashMap and just use the contains method?    stackoverflow.com

I currently have this very long if statement:

if (somesTring != null && !"".equals(somestring)
  SomeClass.doSomething();
else if (somesTring != null && !"".equals(somestring)
  SomeClass.doAnother();
...
else
  SomeClass.giveUp();

6. put HashSets into one HashMap, why so difficult?    bytes.com

@dlite922 TreeMaps are sorted maps and all maps can take another Map as a parameter for their constructor. It's a oneliner really. btw, sorting a Map on their values doesn't make ...

7. Getting typeof value put in the HashMap    coderanch.com

Hi, How can i get the type of value put in the Hashmap.That is suppose if i am putting a double value like this: Double doub = new double("1.5"); hashmap.put("1",doub); Now in some other class while getting the key's value using hashMap.get("1"), first i want to check the type of the value. So how can i do that?? Thanks, Jignesh

8. Is HashMap.put() atomic?    coderanch.com

Hi, I have a Question. Consider that i have a global HashMap hashMap1. If 1 execute the below statment, it will insert a new entry with key = "k1" (If the key wasnt there) or it will replace the value for "k1" with hashMap2, if the key "k1" is already there. hashMap1.put("k1",hashMap2); Thus I assume that during the time when hashMap1.put("k1",hashMap2); ...

9. HashMap and Input/Out Put file    coderanch.com

That was a good idea, William. Here's one of those: import java.io.*; public class TestBufferedReader { public static void main(String[] args) { String text; try { // Creates a BufferedReader object that takes a // FileReader object as an argument. The FileReader // associates an object with the file to be read. BufferedReader br = new BufferedReader( new FileReader("texttoread.txt")); // The ...

10. put float into hashMap    coderanch.com

11. HashMap put()    coderanch.com

12. HashMap .put question    forums.oracle.com

The scope of your HashMap is your method. It is created everytime you call that method and it's garbaged when you leave it. You'll have to either pass your map as an argument or make it a field variable in your class. (and you may want to rethink your naming of that method)

13. How to put the Hashmap values    forums.oracle.com

14. HashMap put issue    forums.oracle.com

I am create a HashMap and trying to put some values in it, where key is a String and value is an ArrayList. I am putting about 11 values in it. But when trying to put one key-value pair it is replacing another key-value pair in it instead of adding to the map. Both the keys are completely different. Not sure ...

15. how to put most freqquent words from a file into a hashmap    forums.oracle.com

Hi, I have a file which contains a lot of words (only words). I want to take only those words which are occurring more than 3 times into another file . This I have to do using hashmap. I have to use a counter (maybe) using the hashmap and this counter will keep track of the number of occurrences of the ...