java利用反射扩展任意数组的方法
package com.company;
import java.lang.reflect.Array;
import java.util.Arrays;
/**
* java利用反射扩展任意数组的方法
*/
public class TestReflect {
public static void main(String[] args) {
int[] arr = {1,2,3,4,5};
int[] o = (int[]) exprendArrayLength(arr, 8);
System.out.println(Arrays.toString(o));
}
public static Object exprendArrayLength(Object a, int newLength){
Class<?> aClass = a.getClass();
if(!aClass.isArray()){
return null;
}
Class<?> componentType = aClass.getComponentType();
int length = Array.getLength(a);
Object newArray = Array.newInstance(componentType, newLength);
System.arraycopy(a,0,newArray,0,Math.min(length,newLength));
return newArray;
}
}
运行结果:
