Code instance sharing _java dynamically changing array length and array to map in Java

changes the length of the array dynamically

/** * Reallocates An-array with a new size, and copies the contents * of the ' old ' array to the new array.  
 * * @param oldarray the "old" array, to be reallocated.  
 * * @param newsize the new array size.  
 * * @return A new array with the same contents. * */private static object Resizearray (object oldarray, int newsize) {int oldsize = Java.lang.reflect.Array.getL    
  Ength (Oldarray);    
  Class ElementType = Oldarray.getclass (). Getcomponenttype ();    
  Object NewArray = java.lang.reflect.Array.newInstance (elementtype,newsize);    
  int preservelength = Math.min (oldsize,newsize);    
  if (Preservelength > 0) system.arraycopy (oldarray,0,newarray,0,preservelength);  return newarray;   
//Test routine for Resizearray ().    
  public static void Main (string[] args) {int[] a = {1,2,3};    
  A = (int[]) Resizearray (a,5);    
  A[3] = 4;    
  A[4] = 5; for (int i=0; i<a.length; i++) System.out.println (a[i)); 
 }

Code is just the implementation of the basic method, detailed processing also need you to coding oh >>

Convert Array to Map

Import Java.util.Map;   
Import Org.apache.commons.lang.ArrayUtils;    
public class Main {public     
  static void Main (string[] args) {     
    string[][] countries = {{"United States", "New York "},  
        {" United Kingdom "," London "},       
        {" Netherland "," Amsterdam "},  
        {" Japan "," Tokyo "},  
        {" France "," Par Is '}};      
    Map countrycapitals = arrayutils.tomap (countries);      
    System.out.println ("Capital of the Japan is" + countrycapitals.get ("Japan"));     
    System.out.println ("Capital of the France is" + countrycapitals.get ("France"));    
}