Java heap space

[mickey]

Hello,
i write a program that creates many hashTable; it counts the frequency of each word in some document s(that it's very large). So there are many words... This is a part of code. Do you know how come overcome this problem (in general) ?

thanks

..............................
HashMap<String, Double> frequency = null;
  for (every document )  {
        frequency = new HashMap<String, Double>();
         //select a word and count
        frequecny.put( myWord , new Integer (count ) );
}
.................................................................

..............................
HashMap<String, Double> frequency = null;
  for (every document )  {
        frequency = new HashMap<String, Double>();
         //select a word and count
        frequecny.put( myWord , new Integer (count ) );
}
.................................................................

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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at java.util.HashMap.resize(Unknown Source)
        at java.util.HashMap.addEntry(Unknown Source)
        at java.util.HashMap.put(Unknown Source)
        at MyClass.setting(MyClass.java:71)
        at filter.main(filter.java:19)

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at java.util.HashMap.resize(Unknown Source)
        at java.util.HashMap.addEntry(Unknown Source)
        at java.util.HashMap.put(Unknown Source)
        at MyClass.setting(MyClass.java:71)
        at filter.main(filter.java:19)

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