Example usage for java.util Hashtable size

Introduction

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

Prototype

public synchronized int size()

Source Link

Document

Returns the number of keys in this hashtable.

Usage

From source file:Main.java

public static void main(String[] args) {
    Hashtable<String, String> ht = new Hashtable<String, String>();

    System.out.println("Size of Hashtable : " + ht.size());

    ht.put("1", "One");
    ht.put("2", "Two");
    ht.put("3", "Three");

    System.out.println(ht.size());

    Object obj = ht.remove("2");

    System.out.println(ht.size());
}

From source file:Main.java

public static void main(String[] args) {
    Hashtable<String, String> ht = new Hashtable<String, String>();

    ht.put("1", "One");
    ht.put("2", "Two");
    ht.put("3", "Three");
    ht.clear();/*from  w w  w  .j  av a2s.  c om*/
    System.out.println(ht.size());
}

From source file:MainClass.java

public static void main(String[] s) {
    Hashtable table = new Hashtable();
    table.put("key1", "value1");
    table.put("key2", "value2");
    table.put("key3", "value3");

    System.out.println(table.isEmpty());
    System.out.println(table.size());
}

From source file:Main.java

public static void main(String[] s) {
    Hashtable<String, String> table = new Hashtable<String, String>();
    table.put("key1", "value1");
    table.put("key2", "value2");
    table.put("key3", "value3");

    System.out.println(table.isEmpty());
    System.out.println(table.size());
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    Hashtable hash = new Hashtable(89);
    hash.put("one", "two");
    hash.put("two", "three");
    hash.put("three", "four");
    hash.put("four", "five");
    System.out.println(hash);/*from   w  w  w . j  a  va 2  s.co m*/
    System.out.println(hash.size());
    Enumeration e = hash.keys();
    while (e.hasMoreElements()) {
        String key = (String) e.nextElement();
        System.out.println(key + " : " + hash.get(key));
    }
    Set set = hash.entrySet();
    Iterator it = set.iterator();
    while (it.hasNext()) {
        Map.Entry entry = (Map.Entry) it.next();
        System.out.println(entry.getKey() + " : " + entry.getValue());
    }
}

From source file:Main.java

public static void main(String args[]) {
    // create hash table 
    Hashtable<Integer, String> htable1 = new Hashtable<Integer, String>();

    // put values in table
    htable1.put(1, "A");
    htable1.put(2, "B");
    htable1.put(3, "C");
    htable1.put(4, "from java2s.com");

    System.out.println("Size of the hash table is: " + htable1.size());
}

From source file:Main.java

public static Hashtable nullIfEmpty(Hashtable h) {
    return (h == null ? null : (h.size() == 0 ? null : h));
}

From source file:Main.java

public static boolean emptyHash(Hashtable hash) {
    boolean result = true;
    if ((hash != null) && (hash.size() > 0)) {
        result = false;//from w w w. j av a2  s .c  o m
    }
    return result;
}

From source file:Main.java

/**
 * Convert to array./*from   ww w.ja v a  2s .c  om*/
 * 
 * @param data the data
 * 
 * @return the object[]
 */
private static Object[] convertToArray(Hashtable data) {
    Object[] result = new Object[data.size()];
    for (int i = 0; i < data.size(); i++) {
        result[i] = data.get(i + "");
    }
    return result;
}

From source file:org.compass.core.jndi.NamingHelper.java

public static InitialContext getInitialContext(CompassSettings settings) throws NamingException {
    Hashtable hash = getJndiProperties(settings);
    try {/*from   w w  w .jav  a2s . c om*/
        return (hash.size() == 0) ? new InitialContext() : new InitialContext(hash);
    } catch (NamingException e) {
        log.error("Could not obtain initial context with settings [" + hash + "]", e);
        throw e;
    }
}