数组扩容

数组扩容代码：
package cn.tedu.demo;
import java.util.Arrays;
public class Demo {
public static void main(String[] args) {
//数组扩容
int[] nums = {1,2,3,5,6,7,9};
int[] arr = Arrays.copyOf(nums,nums.length*2);
System.out.println(Arrays.toString(arr));
}
}
输出：[1, 2, 3, 5, 6, 7, 9, 0, 0, 0, 0, 0, 0, 0]

数组扩容代码图：