create 2d barcode vb.net javautil Part 1: The Collections Framework in Java

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javautil Part 1: The Collections Framework
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Method void clear( ) Object clone( ) boolean contains(Object value) boolean containsKey(Object key) boolean containsValue(Object value) Enumeration<V> elements( ) V get(Object key) boolean isEmpty( ) Enumeration<K> keys( ) V put(K key, V value)
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Description Resets and empties the hash table Returns a duplicate of the invoking object Returns true if some value equal to value exists within the hash table Returns false if the value isn t found Returns true if some key equal to key exists within the hash table Returns false if the key isn t found Returns true if some value equal to value exists within the hash table Returns false if the value isn t found Returns an enumeration of the values contained in the hash table Returns the object that contains the value associated with key If key is not in the hash table, a null object is returned Returns true if the hash table is empty; returns false if it contains at least one key Returns an enumeration of the keys contained in the hash table Inserts a key and a value into the hash table Returns null if key isn t already in the hash table; returns the previous value associated with key if key is already in the hash table Increases the size of the hash table and rehashes all of its keys Removes key and its value Returns the value associated with key If key is not in the hash table, a null object is returned Returns the number of entries in the hash table Returns the string equivalent of a hash table
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void rehash( ) V remove(Object key) int size( ) String toString( )
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TABLE 17-18
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The Legacy Methods Defined by Hashtable
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The following example reworks the bank account program, shown earlier, so that it uses a Hashtable to store the names of bank depositors and their current balances:
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// Demonstrate a Hashtable import javautil*; class HTDemo { public static void main(String args[]) { Hashtable<String, Double> balance = new Hashtable<String, Double>(); Enumeration<String> names; String str; double bal; balanceput("John Doe", 343434); balanceput("Tom Smith", 12322); balanceput("Jane Baker", 137800); balanceput("Tod Hall", 9922); balanceput("Ralph Smith", -1908); // Show all balances in hashtable names = balancekeys();
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Part II:
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while(nameshasMoreElements()) { str = namesnextElement(); Systemoutprintln(str + ": " + balanceget(str)); } Systemoutprintln(); // Deposit 1,000 into John Doe's account bal = balanceget("John Doe"); balanceput("John Doe", bal+1000); Systemoutprintln("John Doe's new balance: " + balanceget("John Doe")); } }
The output from this program is shown here: Todd Hall: 9922 Ralph Smith: -1908 John Doe: 343434 Jane Baker: 13780 Tom Smith: 12322 John Doe s new balance: 443434 One important point: like the map classes, Hashtable does not directly support iterators Thus, the preceding program uses an enumeration to display the contents of balance However, you can obtain set-views of the hash table, which permits the use of iterators To do so, you simply use one of the collection-view methods defined by Map, such as entrySet( ) or keySet( ) For example, you can obtain a set-view of the keys and cycle through them using either an iterator or an enhanced for loop Here is a reworked version of the program that shows this technique:
// Use iterators with a Hashtable import javautil*; class HTDemo2 { public static void main(String args[]) { Hashtable<String, Double> balance = new Hashtable<String, Double>(); String str; double bal; balanceput("John Doe", 343434); balanceput("Tom Smith", 12322); balanceput("Jane Baker", 137800); balanceput("Tod Hall", 9922); balanceput("Ralph Smith", -1908); // Show all balances in hashtable // First, get a set view of the keys
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javautil Part 1: The Collections Framework
Set<String> set = balancekeySet(); // Get an iterator Iterator<String> itr = setiterator(); while(itrhasNext()) { str = itrnext(); Systemoutprintln(str + ": " + balanceget(str)); } Systemoutprintln(); // Deposit 1,000 into John Doe's account bal = balanceget("John Doe"); balanceput("John Doe", bal+1000); Systemoutprintln("John Doe's new balance: " + balanceget("John Doe")); } }
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