- Algorithms Source Code in Java

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A D V E R T I S E M E N T

Title
Author	Sourav Datta
Author Email	soura_jagat [at] yahoo.com
Description	A simple hashtable in Java
Category	Java » Algorithms
Hits	390349
Code	Select and Copy the Code
import java.util.; class Entry{ String name; String desc; } class Hash{ private final int HASHSIZE=101; private ArrayList<LinkedList<Entry>> hashtab; public Hash(){ hashtab=new ArrayList<LinkedList<Entry>>(HASHSIZE); for(int i=0;i<HASHSIZE;i++) hashtab.add(new LinkedList<Entry>()); } private int hash(String s){ int h=0; for(int j=0;j<s.length();j++) h=(int)s.charAt(j)+h31; return h%HASHSIZE; } private int lookup(String name){ int i=hash(name); LinkedList<Entry> l=hashtab.get(i); for(int j=0;j<l.size();j++) if((l.get(j)).name.equals(name)) return j; return -1; } public void install(String name,String desc){ int e; Entry ent=new Entry(); ent.name=name; ent.desc=desc; int hi=hash(name); if((e=lookup(name))!=-1) (hashtab.get(hi)).set(e,ent); else (hashtab.get(hi)).add(ent); } public String restore(String name){ int i; if((i=lookup(name))!=-1){ int hi=hash(name); return ((hashtab.get(hi)).get(i)).desc; } else return null; } } class hash_test{ public static void main(String args[]){ Hash h=new Hash(); h.install("NAME","Sourav"); h.install("ADD","Sinagor"); h.install("PHONE","26300788"); System.out.println("PHONE : "+h.restore("PHONE")); h.install("PHONE","9433120451"); System.out.println("PHONE : "+h.restore("PHONE")); System.out.println("HOBBY : "+h.restore("HOBBY")); } }

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