Grow array : Array « Collections Data Structure « Java
Grow array
import java.lang.reflect.Array;
public class ArrayGrowTest {
public static void main(String[] args) {
int[] a = { 1, 2, 3 };
a = (int[]) arrayGrow(a);
arrayPrint(a);
}
static Object arrayGrow(Object a) {
Class cl = a.getClass();
if (!cl.isArray())
return null;
Class componentType = a.getClass().getComponentType();
int length = Array.getLength(a);
int newLength = length + 10;
Object newArray = Array.newInstance(componentType, newLength);
System.arraycopy(a, 0, newArray, 0, length);
return newArray;
}
static void arrayPrint(Object a) {
Class cl = a.getClass();
if (!cl.isArray())
return;
Class componentType = a.getClass().getComponentType();
int length = Array.getLength(a);
System.out.println(componentType.getName() + "[" + length + "]");
for (int i = 0; i < length; i++)
System.out.println(Array.get(a, i));
}
}
