Created
May 30, 2009 04:14
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/** | |
* 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.getLength(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]); | |
} |
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