I don't know how to solve this,help me please

Question

Fill in the blanks to add three items to the list, sort it, and print 2.
List<Integer> list = new ArrayList<Integer>();
list.

(4);
list.add(2);

.add(1);
Collections.

(list);
System.out.println(list.get(

));

Answer 1

add
list
sort
1

First two are hopefully self explanatory.

sort is a method you can use in Collections, it will sort the list into ascending order.

Since its now sorted in ascending order the values are:
{1, 2, 4}

2 is at the index of 1.
get(index) is what the method is expecting.
So, get(1)

Answer 2

List<Integer> list = new ArrayList<Integer>();
list.add(4);
list.add(2);

list.add(1);
Collections.sort(list);
System.out.println(list.get(1));

Answer 3

Here is the solution :
add
list
sort
1

Answer 4

thanks,i've solved it by myself,but thanks anyway,we need explanation for those codes

Answer 5

Try this may help you
add
list
sort
1

Answer 6

add
list
sort
1