Using Hash maps

Hi
Just a quick one
I have two hash maps - each containing information on the location of characters in a individual string.
Is there some sort of method that allows me to compare the two maps and return the string locations where they contain the same information ?

Hi evett,
You might want to check out the method "entrySet()" in the Map class, once you get the 2 Set's, you can then use the "retainAll()" method of a Set to only keep the information that is the same in both Set's (which contains the information you want).
Good Luck,
Bud

Similar Messages

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    Hi All,
    I want to create a dictionary using hash map where in i can add new words and there meaning. I have written some code But I am not happy with this. Can you suggest me how to add the words and there meanings to the hash map.
    I am not able to add the words and there meaning to the hash map.
    for this i tried creating a dictionary class.
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            hm.put("Dinner: ","Last meal of the day generally had after evening and before sleeping");
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            while (i.hasNext())
                Map.Entry me = (Map.Entry) i.next();
                System.out.print(me.getKey() + ": ");
                System.out.println(me.getValue());
            System.out.println();
    }This is the other Dictionary class which i created.
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            cd.getContent_Dictionary("Abode", "Home");
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    }If i create an interface containing all the words and there meaning
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        String Dark = "Lacking brightness";
        String Balance = "An intrument to measure or weigh";
        String Car = "Type of Automobile";
        String Dinner = "Last meal of the day";
        String Embossed  = "Engraved kind";
        String Adroit = "SkillFul";
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    I tried creating word document but i was unable to
    figure out how to do the operations on the word
    document and its content,
    So This is what i could come up with, i just created
    one class Dictionary , now I am able to search for
    the meaning of the word specified by me, and I am
    able to print all the words and there meanings added
    to the hashmap, but i am not able to figure out how
    to add a new word and the meaning in the hashmap and
    how to find is a word is there or not...May I suggest a slightly different approach?
    Do not create a String ==> String mapping, but a String ==> List<String> mapping. And do NOT place everything inside your main method.
    Here's a small demo:
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    import java.util.Map;
    import java.util.HashMap;
    import java.util.List;
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        private Map< String, List<String >> dictionary;
        public Dictionary() {
            dictionary = new HashMap< String, List<String >>();
        public void addWord(String base, String meaning) {
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                List<String> newMeanings = new ArrayList<String>();
                newMeanings.add(meaning);
                dictionary.put(base, newMeanings);
            } else {
                allMeanings.add(meaning);
        public List<String> search(String base) {
            // your code here
            return null;
        // ... other methods ...
        public String toString() {
            StringBuilder strb = new StringBuilder();
            for(Map.Entry< String, List<String >> e : dictionary.entrySet()) {
                strb.append(e.getKey());
                strb.append(" : ");
                strb.append(e.getValue());
                strb.append('\n');
            return strb.toString();
        public static void main(String[] args) {
            Dictionary dict = new Dictionary();
            dict.addWord("Abode", "Home");
            dict.addWord("Abode", "House");
            dict.addWord("Car", "Automobile");
            dict.addWord("Car", "Vehicle");
            System.out.println(dict);
    }Good luck.

  • Reterving Details using hash map

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    Hey Tre by making your class public like
    public class A{
    }HTH-
    Cheers,
    Gaurav

  • How to store  double  variable in hash map

    i need to store double variable using hash map, but i cant able to store it
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    C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\exam\org\apache\jsp\availability_jsp.java:752:
    put(java.lang.Object,java.lang.Object) in java.util.Map cannot be applied to (java.lang.String,double)
    hm.put("stm",st);
    ^
    how to overcome this problem
    thank u in advance

    double etme;
    etme = hm.getDouble("etm");
    i'm getting this error
    C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\exam\org\apache\jsp\editdel_jsp.java:85: cannot resolve symbol
    symbol : method getDouble (java.lang.String)
    location: interface java.util.Map
    etme = hm.getDouble("etm");
    ^
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    plz help me

  • How to find Regular Expressions in a Hash Map

    Hi,
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    // Sample code...
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            Matcher mt2 = pat.matcher(test2);
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            Matcher mt3 = pat.matcher(test3);
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            Matcher mt4 = pat.matcher(test4);
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  • Sorting in List Hash Map

    Hi All ,
    I i have the data in below format:
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    Vass     21     Java     Zylog
    Samy     24     PB     HP
    Lee     18     ADF     CTS
    Reng     16     Java     Info
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    import java.util.HashMap;
    import java.util.Iterator;
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        public static void main(String[] args) {
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            List<HashMap> list = new ArrayList<HashMap>();
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            hm.put("Age", new Integer(21));
            hm.put("Company", new String("Zylog"));
            hm.put("skill", new String("Java"));
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            hm1.put("Name", new String("Samy"));
            hm1.put("Age", new Integer(24));
            hm1.put("Company", new String("HP"));
            hm1.put("skill", new String("PB"));
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            hm2.put("Name", new String("Lee"));
            hm2.put("Age", new Integer(18));
            hm2.put("Company", new String("CTS"));
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            hm3.put("Name", new String("Reng"));
            hm3.put("Age", new Integer(16));
            hm3.put("Company", new String("Info"));
            hm3.put("skill", new String("Java"));
            list.add(hm3);
            Iterator i = list.iterator();
            while (i.hasNext()) {
                System.out.println(i.next());
    } As per data (table format) i want to sort the data in Column level
    how can i to achieve ?.
    List<HashMap> is type of collection is help to me?
    Any idea?
    Thanks,
    Vass Lee

    Check out Comparator, and use Google to find examples on how to use it.
    http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html
    Still sorting a collection of hashmaps is a bit odd design though. I think you want to create a simple class with properties in stead of a HashMap, then implement Comparable on that class.

  • How to sor hash map

    Hi,
    [b] how to sort hash map contains integer objects,
    HashMap map=new HashMap();
    map.put("1",new Integer("1"));
    map.put("2",new Ineger("2")):
    map.put("3",new Ineger("3")):
    map.put(4,new Integer("4"));
    map.put("10",new Integer("10"));
    map.put("11",new Integer("11"));
    map.put("12",new Integer("12"));
    map.put("20",new Integer("20"));
    map.put(30,new Integer("30"));
    if i am using treemap
    TreeMap map1=new TreeMap(map);
    System.out.println(map1);
    answer is
    1 ,10,11,12,2,20,3,30,4
    but i am accepting the results
    1,2,3,4,10,11,12,20,30.
    what to do
    with regardsshannu sarma[/b]

    This is usual behaviour of a Map. You cannot sort a Set or Map. You can sort a List only using Collections.sort().
    If you want to use a Map which adds all elements according to the order you've added it, then use LinkedHashMap.
    And if you want to capture the keys, use Map.values() which returns an ordered Collection (and after converting it to List, you can sort it).
    Another approach is to create a wrapper object and put it in a List. Then you can use the java.util.Comparator to sort objects in a List.

  • Is it possible to insert a value in a hash map at a perticular index ?

    Hello Techies,
    I have a drop down list which is used to select a contry name. I also contains " All " option which is used to select all countries.
    I am using HashMap for this drop down list for getting corresponding value.
    Now, my requirement is the " All " should display as the first in the drop down list. Hash map didn't support bcoz it is in sorted order,
    Can any one help me with alternative solution ?
    Thanks in advance.
    Javed

    Now, my requirement is the " All " should display as the first in the drop down
    list. Hash map didn't support bcoz it is in sorted order,Rather HashMap doesn't support this because according to the first paragraph
    of its API documentation "This class makes no guarantees as to the order of the
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  • While loop in a Hash Map

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A: while loop in a Hash Map

what if you looped on the key set?
  public Employee find(String id)
    Employee foundEmployee = null;
    Set<Integer> keySet = register.keySet();
    for (Integer key : keySet)
      Employee right = register.get(key);
      if (right.getName().equals(id))
        foundEmployee = right;
        break;
    return foundEmployee;
  }

what if you looped on the key set?
  public Employee find(String id)
    Employee foundEmployee = null;
    Set<Integer> keySet = register.keySet();
    for (Integer key : keySet)
      Employee right = register.get(key);
      if (right.getName().equals(id))
        foundEmployee = right;
        break;
    return foundEmployee;
  }

  • How do I use Port Mapping?

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    <a href="http://docs.info.apple.com/article.html?artnum=52002>"Designing AirPort Extreme Networks: Manuals</a>
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    IANA Port Number Assignments

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