Java数组扩容实现方法解析

package com.xuefei.arrayTest;
/**
 * 
 * @author 雪飞oubai
 *  数组扩容
 */
public class BigArray {
	public static int[] addArray(int[] arr1) {
		int[] arr2=new int[arr1.length*2];
		//新数组长度
		for (int i = 0 ; i < arr1.length ; i++) {
			arr2[i] = arr1[i];
		}
		return arr2;
	}
	public static void main(String[] args) {
		int[] arr ={1,2};
		int[] bigarr = addArray(arr);
		System.out.println(bigarr.length);
	}
}