these are the given information and I'm struggling with remove

public class Queue {

public int size;

public String[] items;

/**

* initialize array to an empty array and size to 0

*/

public Queue() {

size = 0;

items = new String[0];

}

/**

*

* @return the front item (and remove it) from the queue.

* return null if queue is empty.

*/

public String remove() {

code here

return ;

}

@@ test

class QueueTest {

Queue q1, q2, q3;

@BeforeEach

public void run() {

q1 = new Queue();

q2 = new Queue();

q3 = new Queue();

for(int i=0; i < 100; i++) {

q2.insert((i+1)+"");

}

for(int i=0; i < 1000; i++) {

q3.insert((i+1)*2+"");

}

}

public void testRemove() {

assertNull(q1.remove());

for(int i=0; i < 100; i++) {

String str = q2.remove();

assertNotNull(str);

assertEquals((i+1)+"", str);

}

assertNull(q2.remove());

for(int i=0; i < 1000; i++) {

String str = q3.remove();

assertNotNull(str);

assertEquals((i+1)*2+"", str);

}

assertNull(q3.remove());