Question

1. What control structure does Java use to process all elements in a collection?
   1. A do-while loop.
   2. A for loop.
   3. A for-each loop.
   4. A while loop.
2. Which of the following is a valid Java array declaration?
   1. String array s[10];
   2. String[] s;
   3. String[10] s;
   4. Array String[] s;
3. Which of the following references will get the last element in an array of n elements named a?
   1. a[n-1]
   2. a[n]
   3. a[n+1]
   4. a

Answer 1

1. All elements of a collection can be processed most easily through a for-each loop. However, it is not the best option if these elements need to be altered.

2. The correct syntax is String[] s (if the array is defined without size). It can be declared as String[] = new String[n] for an array of size n.

3. Since the 1st elements of an array is accessed as a[0], the last element can be accessed by a[n-1]

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