OCJP Practice Papers Using Loop Constructs include following topics

• Create and use while loops
• Create and use for loops including the enhanced for loop
• Create and use do/while loops
• Compare loop constructs
• Use break and continue

See the complete syllabus for OCJP here

1. Which type of loop is best known for its boolean condition that controls entry to theloop?
A. do-while loop
B. for (traditional)
C. for-each
D. while

2. Which type of loop is best known for using an index or counter?
A. do-while loop
B. for (traditional)
C. for-each
D. while

3. Which type of loop is guaranteed to have the body execute at least once?
A. do-while loop
B. for (traditional)
C. for-each
D. while

4. Which of the following can loop through an array without referring to the elements byindex?
A. do-while loop
B. for (traditional)
C. for-each
D. while

5. What keyword is used to end the current loop iteration and proceed execution with thenext iteration of that loop?
A. break
B. continue
C. end
D. skip

6. What keyword is used to proceed with execution immediately after a loop?
A. break
B. continue
C. end
D. skip

7. Which type of loop has three segments within parentheses?
A. do-while loop
B. for (traditional)
C. for-each
D. while

8. Which of the following statements is/are true? I. A traditional for loop can iterate through an array starting from index 0. II. A traditional for loop can iterate through an array starting from the end.
A. Only I
B. Only II
C. Both statements
D. Neither statement

9. Which of the following statements is/are true? I. A for-each loop can iterate through an array starting from index 0. II. A for-each loop can iterate through an array starting from the end.
A. Only I
B. Only II
C. Both statements
D. Neither statement

10. Which type of loop has a boolean condition that is first checked after a single iterationthrough the loop?
A. do-while loop
B. for (traditional)
C. for-each
D. while

11. What does the following code output?

int singer = 0;
while (singer)
System.out.println(singer++);

12. What does the following code output?

ListString drinks = Arrays.asList("can", "cup");
for (int container = drinks.size() - 1; container = 0; container )
System.out.print(drinks.get(container) + ",");

13. What does the following code output?

public static void main(String[] args) {
ListString bottles = Arrays.asList("glass", "plastic");
for (int type = 0; type  bottles.size();) {
System.out.print(bottles.get(type) + ",");
break;
}
System.out.print("end");
}

14. What does the following code output?

String letters = "";
while (letters.length() != 2)
letters+="a";
System.out.println(letters);

15. What is the result of the following when run with java peregrine.TimeLoopSeptember 3 1940?

package peregrine;
public class TimeLoop {
public static void main(String[] args) {
for (int i = args.length; i=0; i++)
System.out.println("args");
}
}

16. What is the output of the following code?

package chicago;
public class Loop {
private static int count;
private static String[] stops = new String[] { "Washington",
"Monroe", "Jackson", "LaSalle" };
public static void main(String[] args) {
while (count  stops.length) {
if (stops[count++].length()  8) {
break;
}
}
System.out.println(count);
}
}

17. What is the result of the following code?

do {
int count = 0;
do {
count++;
} while (count  2);
break;
} while (true);
System.out.println(count);

18. Which of the following segments of a for loop can be left blank?

for (segmentA; segmentB; segmentC) {
}

19. How many of the loop types (while, do while, traditional for, and enhanced for) allowyou to write code that creates an infinite loop?
A. One
B. Two
C. Three
D. Four

20. What is the output of the following?

ListString drinks = Arrays.asList("can", "cup");
for (int container = 0; container  drinks.size(); container++)
System.out.print(drinks.get(container) + ",");

21. What happens when running the following code?

do (
System.out.println("helium");
) while (false);

22. Which of the following is equivalent to this code snippet given an array of Stringobjects?

for (int i=0; ifun.length; i++)
System.out.println(fun[i]);

23. How many of these statements can be inserted after the println to have the code flowfollow the arrow in this diagram?

break;
break letters;
break numbers;

24. Using the diagram in the previous question, how many of these statements can beinserted after the println to have the code flow follow the arrow in the diagram?

continue;
continue letters;
continue numbers;

25. What does the following code output?

int singer = 0;
while (singer  0)
System.out.println(singer++);

26. Which of the following types is taxis not allowed to be in order for this code to compile?

for (Object obj : taxis) {
}

27. What is the output of the following?

boolean balloonInflated = false;
do {
if (!balloonInflated) {
balloonInflated = true;
System.out.print("inflate-");
}
} while (! balloonInflated);
System.out.println("done");

28. What does the following code output?

String letters = "";
while (letters.length() != 3)
letters+="ab";
System.out.println(letters);

29. What describes the order in which the three expressions appear in a for loop?
A. boolean conditional, initialization expression, update statement
B. initialization expression, boolean conditional, update statement
C. initialization expression, update statement, boolean conditional
D. None of the above

30. What is the result of the following?

int count = 10;
ListCharacter chars = new ArrayList();
do {
chars.add('a');
for (Character x : chars) count -=1;
} while (count  0);
System.out.println(chars.size());

31. What is the result of the following?

int k = 0;
for (int i = 10; i  0; i ) {
while (i  3) i = 3;
k += 1;
}S
ystem.out.println(k);

32. Which of the following is equivalent to this code snippet given an array of String objects?

for (int i=fun.length-1; i=0; i )
System.out.println(fun[i]);

33. What does the following code output?

public static void main(String[] args) {
ListString bottles = Arrays.asList("glass", "plastic");
for (int type = 0; type  bottles.size();)
System.out.print(bottles.get(type) + ",");
break;
System.out.print("end");
}

34. What is the result of the following?

String[] nycTourLoops = new String[] { "Downtown", "Uptown", "Brooklyn" };
String[] times = new String[] { "Day", "Night" };
for (int i = 0, j = 0; i  nycTourLoops.length
&& j  times.length; i++; j++)
{
System.out.print(nycTourLoops[i] + " " + times[j] + "-");
}

35. What is the result of the following when run with java peregrine.TimeLoop September 3 1940?

package peregrine;
public class TimeLoop {
public static void main(String[] args) {
for (int i = args.length; i=0; i )
System.out.println(args[i]);
}
}

36. What is the output of the following?

public class Shoelaces {
public static void main(String[] args) {
String tie = null;
while (tie == null)
tie = "shoelace";
System.out.print(tie);
}
}

37. The following code outputs a single letter x. What happens if you remove lines 25 and 28?

23: String race = "";
24: loop:
25: do {
26: race += "x";
27: break loop;
28: } while (true);
29: System.out.println(race);

38. What is the output of the following code?

package chicago;
public class Loop {
private static int count;
private static String[] stops = new String[] { "Washington",
"Monroe", "Jackson", "LaSalle" };
public static void main(String[] args) {
while (count  stops.length) {
if (stops[count++].length()  8) {
continue;
}
}
System.out.println(count);
}
}

39. What is the output of the following?

StringBuilder builder = new StringBuilder();
String str = new String("Leaves growing");
do {
System.out.println(str);
} while (builder);
System.out.println(builder);

40. What is the result of the following code?

6: int count = 0;
7: do {
8: do {
9: count++;
10: } while (count  2);
11: break;
12: } while (true);
13: System.out.println(count);

41. Fill in the blank so this code compiles and does not cause an infinite loop.

t: while (true) {
f: while(true) {
_____________
}
}

42. What is the result of the following?

String[] nycTourLoops = new String[] { "Downtown", "Uptown", "Brooklyn" };
String[] times = new String[] { "Day", "Night" };
for (int i = 0, j = 0; i  nycTourLoops.length
&& j  times.length; i++, j++)
{
System.out.print(nycTourLoops[i] + " " + times[j] + "-");
}

43. How many lines does the following code output?

import java.util.*;
public class Exams {
public static void main(String[] args) {
ListString exams = Arrays.asList("OCA", "OCP");
for (String e1 : exams)
for (String e2 : exams)
System.out.println(e1 + " " + e2);
}
}

44. Which of the following best describes the flow of execution in this for loop if beta always returns false?

for (alpha; beta; gamma) {
delta;
}

45. Which of the following best describes the flow of execution in this for loop if the loop body is run exactly once?

for (alpha; beta; gamma) {
delta;
}

46. Which of the following iterates a different number of times than the others?
A. for (int k=0; k 5; k++) {}
B. for (int k=1; k = 5; k++) {}
C. int k=0; do { } while(k++ 5)
D. int k=0; while (k++ 5) {}

47. What is the output of the following?

public class Shoelaces {
public static void main(String[] args) {
String tie = null;
while (tie == null);
tie = "shoelace";
System.out.print(tie);
}

48. What is the output of the following?

12: int result = 8;
13: for: while (result  7) {
14: result++;
15: do {
16: result--;
17: } while (result  5);
18: break for;
19: }
20: System.out.println(result);

49. What is the output of the following?

boolean baloonInflated = false;
do {
if (!baloonInflated) {
baloonInflated = true;
System.out.print("inflate-");
}
} while (baloonInflated);
System.out.println("done");

50. Which of the following can fill in the blank to have the code compile successfully?

package nyc;
public class TouristBus {
public static void main(String... args) {
String[] nycTourLoops = new String[] { "Downtown", "Uptown", "Brooklyn"
};
String[] times = new String[] { "Day", "Night" };
for (_____________ i  1; i++, j++)
System.out.println(nycTourLoops[i] + " " + times[j]);
}
}

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