java中直接输出数组的名输出的是什么？

package test;

public class Test2 {

public static void main(String[] args) {

// TODO Auto-generated method stub

int []a= new int[5];

a[0] = 2;

a[1] = 3;

a[2] = 4;

a[3] = 5;

a[4] = 6;

System.out.println();

}

}