How can I create an array of linked lists in java?

LinkedList[] vertex = new LinkedList[5];
int i = 0, m = 6;
while(i!=m){
int temp = sc.nextInt();
int temp2 = sc.nextInt();

// Make sure the list is initialized before adding to it
if (vertex[temp] == null) {
vertex[temp] = new LinkedList();
}

vertex[temp].add(temp2);
i++;
}

//initialize array
LinkedList[] vertex = new LinkedList[5];
//initialize array elements(objects of LinkedList)
for (int j=0; j<5; j++) vertex[i]=new LinkedList();

int i = 0, m = 6;
while(i!=m){
int temp = sc.nextInt();
int temp2 = sc.nextInt();
vertex[temp].add(temp2);
i++;
}

Normally Arrays are not encouraged in Java. Alternatively you can use this:
//initialize array
List> vertex = new ArrayList>();
//initialize arraylist elements(objects of LinkedList)
for (int j=0; j<5; j++) vertex.add(new LinkedList());