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Nadya [2.5K]
3 years ago
15

Consider the following code segment: ArrayList bulbs = new ArrayList(); bulbs.add(new Light()); bulbs.remove(0); bulbs.add(new L

ight()); 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()); bulbs.add(1, new Light()); After running the code, what is the size of bulbs?
Computers and Technology
2 answers:
mezya [45]3 years ago
6 0

Answer:

4

Explanation:

ArrayList bulbs = new ArrayList();

bulbs.add(new Light()); // bulbs array length equal to 1

bulbs.remove(0); // bulbs array length equal to 0

bulbs.add(new Light()); // bulbs array length equal to 1

Light b = new Light();

bulbs.add(1, b); // bulbs array length equal to 2

bulbs.add(new Light()); // bulbs array length equal to 3

bulbs.remove(0); // bulbs array length equal to 2

bulbs.add(new Light()); // bulbs array length equal to 3

bulbs.remove(2); // bulbs array length equal to 2

bulbs.add(new Light()); // bulbs array length equal to 3

bulbs.add(1, new Light()); // bulbs array length equal to 4

Scrat [10]3 years ago
4 0
To answer this, lets run through the code:

<span>ArrayList bulbs = new ArrayList(); //create a new empty list

bulbs.add(new Light()); //size of bulbs  = 1

bulbs.remove(0); //remove item at index 0. size of bulbs = 0

bulbs.add(new Light()); // size of bulbs = 1

Light b = new Light();
bulbs.add(1, b); // size of bulbs = 2

bulbs.add(new Light()); //size of bulbs = 3

bulbs.remove(0); //remove bulb at index 0. Size of bulbs = 2

bulbs.add(new Light()); size of bulbs = 3

bulbs.remove(2); //remove bulb at index 2. size of bulbs = 2

bulbs.add(new Light()); //size of bulbs = 3

bulbs.add(1, new Light()); //inserted at position 1. size of bulbs = 4

The final answer. Size of bulbs = 4.</span>
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Data files whose records are always retrieved in sequence from the beginning of the file are

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Is recursion ever required to solve a problem? What other approach can you use to solve a problem that is repetitive in nature?
Setler79 [48]

Answer:

No you can not tell that recursion is ever required to solve a problem.

Recursion is required when in the problem, the solution of the input depends on the solution of the subsets of the input.

Iteration is also another form of repetitive approach we follow to solve that kind of problems.

But the difference between recursion and iteration is :

  • In recursion we call the function repeatedly to return the result to next level.
  • In iteration certain bunch of instructions in a loop are executed until certain conditions met.

Explanation:

For example in the Fibonacci sequence problem, to find f_{n}, we need to compute f_{n-1} and f_{n-2} before that.

  • In case of recursion we just call the method Fibonacci(n) repeatedly only changing the parameter Fibonacci(n-1), that calculates the value and return it.

                           Fibonacci(n)

                           1. if(n==0 or n==1)

                           2.       return 1.

                           3.else

                           4.      return( Fibonacci(n-1)+Fibonacci(n-1) )

  • But in case of iteration we run a loop for i=2 to n, within which we add the value of current f_{i-1} and f_{i-2} to find the value of f_{i}

                           Fibonacci(n)

                           1. if(n<=2)

                           2.    result = 1

                           3.     else

                           4. result1 =1 and result2=1.

                           5.      {  result = result1 +result2.

                           6.         result1= result2.

                           7.         result2 = result.

                           8.      }

                           9.  output result.

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