分享非常有用的Java程序 (关键代码)(四)---动态改变数组的大小

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>>

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