Introduction to ArrayList

AP Computer Science A· difficulty 4/5

ArrayList<Integer> list = new ArrayList<>();
list.add(5);
list.add(5);
Integer a = list.get(0);
Integer b = list.get(1);
System.out.println(a.equals(b));

What is printed?

A
$false$
B
$Compile-time error$
C
$true$
check_circle
D
$5$

Explanation

Integer.equals compares the underlying int values. Both Integer objects wrap 5, so equals returns true.

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