Question

edhesive Term 2 - Unit 5 Week 4 19. Consider the following code segment: ArrayList<Light bulbs - new ArrayList<light> (3 bulbs.add(new Light() bulb, remove (0) bulbs.add(new Light () Light b new Light () bulbs.add(1, b); bulbs.add(new Light()); bulbs.remove(0); bulbs.add(new Light()); bulbs.remove (2); bulbs.add(new Light(); After running the code, what is the size of bulbs? h 3 d 5 20. An ArrayList can hold _ a. Only primitive types b. Both class and primitive types c Only class types d. Only Strings e Only Wrapper Classes

Answer 1

//Solution 19

ArrayList<Light> bulbs = new ArrayList<>();
//add Light
bulbs.add(new Light());
//remove light at index 0
bulbs.remove(0);
// add light
bulbs.add(new Light());
// create object of Light
Light b = new Light();
// add light at index 1
bulbs.add(1,b);
// add light
bulbs.add(new Light());
// remove light from index 0
bulbs.remove(0);
// add light
bulbs.add(new Light());
// remove light at index at index 2
bulbs.remove(2);
// add bulb
bulbs.add(new Light());

// Trick -> Count numbers of add and remove

// after subtracting add-remove we get the size

There six numbers of add and three numbers of remove

So the size is 3

Ans -> (b) 3

Solution (20)

An array list can hold only Wrapper types.

Ans: -> e

wrapper class can convert a primitive types (int , float , double, boolean, char)

to reference type(Integer, Float, Double, Boolean, Character etc.)

//Thanks

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