原文:分享非常有用的Java程序 (关键代码)(四)---动态改变数组的大小

/**  * 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]);

}

代码只是实现基础方法，详细处理还需要你去Coding哦>>