Resize an array, System.arraycopy()

     

import java.lang.reflect.Array;

public class Main {

  public static void main(String arg[]) {
    String[] s = (String[]) expand(new String[20]);
    System.out.println(s.length);

  }

  public static Object expand(Object a) {
    Class cl = a.getClass();
    if (!cl.isArray())
      return a;
    int length = Array.getLength(a);
    int newLength = 1000;
    Class componentType = a.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(a, 0, newArray, 0, length);
    return newArray;
  }
}

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Resize an array, System.arraycopy() : Array « Collections Data Structure « Java

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