Source Code : Array Reflection: create instance

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Array Reflection: create instance

   
/* From http://java.sun.com/docs/books/tutorial/index.html */

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import java.lang.reflect.Array;

public class SampleCreateArrayReflection {

  public static void main(String[] args) {
    int[] originalArray = { 55, 66 };
    int[] biggerArray = (int[]) doubleArray(originalArray);
    System.out.println("originalArray:");
    for (int k = 0; k < Array.getLength(originalArray); k++)
      System.out.println(originalArray[k]);
    System.out.println("biggerArray:");
    for (int k = 0; k < Array.getLength(biggerArray); k++)
      System.out.println(biggerArray[k]);
  }

  static Object doubleArray(Object source) {
    int sourceLength = Array.getLength(source);
    Class arrayClass = source.getClass();
    Class componentClass = arrayClass.getComponentType();
    Object result = Array.newInstance(componentClass, sourceLength * 2);
    System.arraycopy(source, 0, result, 0, sourceLength);
    return result;
  }
}


           
         
    
    
  

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