Example usage for java.util Hashtable Hashtable

Introduction

In this page you can find the example usage for java.util Hashtable Hashtable.

Prototype

public Hashtable(int initialCapacity, float loadFactor) 

Source Link

Document

Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

Usage

From source file:Main.java

public static void main(String args[]) {

    Hashtable<Integer, String> htable = new Hashtable<Integer, String>(10, 0.75F);

    // put values into the table
    htable.put(1, "A");
    htable.put(2, "B");
    htable.put(3, "C");
    htable.put(4, "from java2s.com");

    // check table content
    System.out.println("Hash table content: " + htable);

    // clear the table
    htable.clear();//  w w  w  .j av a  2  s .  co m

    // check content after clear
    System.out.println("Hash table content after clear: " + htable);
}

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From source file:Main.java

public static <K, V> Hashtable<K, V> newHashtable(final int initialCapacity, final float loadFactor) {
    return new Hashtable<K, V>(initialCapacity, loadFactor);
}

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From source file:BucketizedHashtable.java

/**
 * Constructs a new, empty BucketizedHashtable with the specified bucket
 * size, initial capacity and load factor.
 * @param bucketSize the number of buckets used for hashing
 * @param initialCapacity the initial capacity of BucketizedHashtable
 * @param loadFactor the load factor of hashtable
 *//*from  www  . java  2  s. c om*/
public BucketizedHashtable(int bucketSize, int initialCapacity, float loadFactor) {
    if (bucketSize <= 0 || initialCapacity < 0) {
        throw new IllegalArgumentException();
    }

    this.bucketSize = bucketSize;

    hashtables = new Hashtable[bucketSize];

    // always round up to the nearest integer so that it has at
    // least the initialCapacity
    int initialHashtableSize = (int) Math.ceil((double) initialCapacity / bucketSize);

    for (int i = 0; i < bucketSize; i++) {
        hashtables[i] = new Hashtable(initialHashtableSize, loadFactor);
    }
}

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From source file:com.github.r351574nc3.amex.assignment1.csv.DefaultInterpreter.java

/**
 * Convert records to {@link TestData}.//from   w  ww . j a v  a  2  s . c  o  m
 *
 * @return {@link Hashtable} instance which makes record lookup by name much easier. Records that belong to a given name are indexed
 * within the {@link Hashtable} instance. In case there is more than one instance, the object in the {@link Hashtable} is
 * a {@link LinkedList} which can be quickly iterated
 */
public Hashtable interpret(final File input) throws IOException {
    final CSVParser parser = CSVParser.parse(input, Charset.defaultCharset(),
            CSVFormat.RFC4180.withDelimiter('|'));

    // Using a {@link Hashtable with the name field on the CSV record as the key. A lower load factor is used to give more
    // priority to the time cost for looking up values. 
    final Hashtable<String, LinkedList<TestData>> index = new Hashtable<String, LinkedList<TestData>>(2, 0.5f);

    for (final CSVRecord record : parser) {
        final EmailNotificationTestData data = toTestData(record);

        LinkedList<TestData> data_ls = index.get(data.getName());
        if (data_ls == null) {
            data_ls = new LinkedList<TestData>();
            index.put(data.getName(), data_ls);
        }
        data_ls.add(data);
    }

    return index;
}

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