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()

Source Link

Document

Constructs a new, empty hashtable with a default initial capacity (11) and load factor (0.75).

Usage

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");

    // create a set view
    Set st = htable1.keySet();/*from   w w w . j  ava  2  s .c  om*/

    System.out.println("Display result: " + st);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Hashtable h = new Hashtable();
    h.put("string", "AAA");
    h.put("int", new Integer(26));
    h.put("double", new Double(Math.PI));

    FileOutputStream fileOut = new FileOutputStream("hashtable.ser");
    ObjectOutputStream out = new ObjectOutputStream(fileOut);
    out.writeObject(h);//from  ww  w  .j  ava  2  s .c  o m

    FileInputStream fileIn = new FileInputStream("h.ser");
    ObjectInputStream in = new ObjectInputStream(fileIn);
    Hashtable h = (Hashtable) in.readObject();
    System.out.println(h.toString());
}

From source file:HTDemo2.java

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

    String str;/*from w  w  w. j  a  v  a  2  s  . c  o  m*/
    double bal;

    balance.put("A", 3434.34);
    balance.put("B", 123.22);
    balance.put("C", 1378.00);
    balance.put("D", 99.22);
    balance.put("E", -19.08);

    Set<String> set = balance.keySet();

    Iterator<String> itr = set.iterator();
    while (itr.hasNext()) {
        str = itr.next();
        System.out.println(str + ": " + balance.get(str));
    }

    System.out.println();

    bal = balance.get("A");
    balance.put("A", bal + 1000);
    System.out.println("A's new balance: " + balance.get("A"));
}

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");

    // create enumeration for keys
    Enumeration en = htable1.keys();

    System.out.println("Display result:");

    // display search result
    while (en.hasMoreElements()) {
        System.out.println(en.nextElement());
    }//from   w w w  .j  ava 2s.co m
}

From source file:MainClass.java

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

    Enumeration<String> names;
    String str;//  w  w  w. ja  va  2s  .  c  o  m

    balance.put("A", 3434.34);

    names = balance.keys();
    while (names.hasMoreElements()) {
        str = names.nextElement();
        System.out.println(str + ": " + balance.get(str));
    }

    System.out.println();
}

From source file:Main.java

public static void main(String[] s) {
    //object hash table 
    Hashtable<String, String> table = new Hashtable<String, String>();

    // populate the table
    table.put("key1", "value1");
    table.put("key2", "value2");
    table.put("key3", "from java2s.com");

    System.out.println("Initial collection: " + table);

    // create unmodifiable map
    Map<String, String> m = Collections.unmodifiableMap(table);

    // try to modify the collection
    m.put("key3", "value3");
}

From source file:Main.java

public static void main(String args[]) {

    Hashtable<String, String> h = new Hashtable<String, String>();
    h.put("a", "b");
    h.put("c", "d");
    h.put("e", "f");

    for (String str : h.keySet()) {
        System.out.println(str);// w  w  w  .  ja  va  2  s  . c  o  m
    }
    List<String> v = new ArrayList<String>(h.keySet());
    Collections.sort(v);

    for (String str : v) {
        System.out.println(str + " " + (String) h.get(str));
    }
}

From source file:Main.java

public static void main(String args[]) {
    Dictionary ht = new Hashtable();
    ht.put("a", "a");
    ht.put("b", new Double(2));
    ht.put("c", "b");
    ht.put("d", new Integer(30));
    show(ht);/*from   www  .j  a v  a2  s  . c o  m*/
}

From source file:MainClass.java

public static void main(String args[]) {
    Hashtable ht = new Hashtable();
    ht.put("a", "a");
    ht.put("b", new Double(2));
    ht.put("c", "b");
    ht.put("d", new Integer(30));
    show(ht);// w w w  . ja  va 2s  .co  m
}

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");

    Collection c = ht.values();//from   w w  w.ja  v a 2 s. c  om
    Iterator itr = c.iterator();
    while (itr.hasNext()) {
        System.out.println(itr.next());
    }
    c.remove("One");

    Enumeration e = ht.elements();

    while (e.hasMoreElements()) {
        System.out.println(e.nextElement());
    }
}