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Q16. Given: 

What is the result? 

A. True false 

B. True null 

C. Compilation fails 

D. A NullPointerException is thrown at runtime 

Answer:


Q17. Given: 

package p1; 

public class Test { 

static double dvalue; 

static Test ref; 

public static void main(String[] args) { 

System.out.println(ref); 

System.out.println(dvalue); 

What is the result? 

A. p1.Test.class 

0.0 

B. <the summary address refrenced by ref> 0.000000 

C. Null 

0.0 

D. Compilation fails 

E. A NullPointerException is thrown at runtime 

Answer:


Q18. Given: 

What is the result? 

A. true true 

B. true false 

C. false true 

D. false false 

E. Compilation fails 

Answer:


Q19. public class ForTest { 

public static void main(String[] args) { 

int[] arrar = {1,2,3}; 

for ( foo ) { 

Which three are valid replacements for foo so that the program will compiled and run? 

A. int i: array 

B. int i = 0; i < 1; i++ 

C. ;; 

D. ; i < 1; i++ 

E. ; i < 1; 

Answer: A,B,C 


Q20. Given: 

What is the result? 

A. int main 1 

B. Object main 1 

C. String main 1 

D. Compilation fails 

E. An exception is thrown at runtime 

Answer:


Q21. Given: 

What is the result? 

A. Compilation fails 

B. The code compiles, but does not execute. 

C. Paildrome 

D. Wow 

E. Mom 

Answer:


Q22. Given the code fragment: 

What is the result? 

A. 100 

B. 101 

C. 102 

D. 103 

E. Compilation fails 

Answer:


Q23. Given the code fragment: 

What is the result? 

A. Execution terminates in the first catch statement, and caught a RuntimeException is printed to the console. 

B. Execution terminates In the second catch statement, and caught an Exception is printed to the console. 

C. A runtime error is thrown in the thread "main". 

D. Execution completes normally, and Ready to us. is printed to the console. 

E. The code fails to compile because a throws keyword is required. 

Answer:


Q24. What is the proper way to defined a method that take two int values and returns their sum as an int value? 

A. int sum(int first, int second) { first + second; } 

B. int sum(int first, second) { return first + second; } 

C. sum(int first, int second) { return first + second; } 

D. int sum(int first, int second) { return first + second; } 

E. void sum (int first, int second) { return first + second; } 

Answer:


Q25. Class StaticField { 

static int i = 7; 

public static void main(String[] args) { 

StaticFied obj = new StaticField(); 

obj.i++; 

StaticField.i++; 

obj.i++; 

System.out.println(StaticField.i + " "+ obj.i); 

What is the result? 

A. 10 10 

B. 8 9 

C. 9 8 

D. 7 10 

Answer:


Q26. Given: 

public class Test { 

public static void main(String[] args) { 

int arr[] = new int[4]; 

arr[0] = 1; 

arr[1] = 2; 

arr[2] = 4; 

arr[3] = 5; 

int sum = 0; 

try { 

for (int pos = 0; pos <= 4; pos++) { 

sum = sum + arr[pos]; 

} catch (Exception e) { 

System.out.println("Invalid index"); 

System.out.println(sum); 

What is the result? 

A. 12 

B. Invalid Index 

C. Invalid Index 

D. Compilation fails 

Answer:

Explanation: The loop ( for (int pos = 0; pos <= 4; pos++) { ), it should be pos <= 3, causes an exception, which is caught. Then the correct sum is printed. 


Q27. Which two statements are true for a two-dimensional array of primitive data type? 

A. It cannot contain elements of different types. 

B. The length of each dimension must be the same. 

C. At the declaration time, the number of elements of the array in each dimension must be specified. 

D. All methods of the class object may be invoked on the two-dimensional array. 

Answer: C,D 

Explanation: http://stackoverflow.com/questions/12806739/is-an-array-a-primitive-type-or-an-object-or-something-else-entirely 


Q28. Given: 

What is the output? 

A. 1Z0 

B. 1Z0-808 

C. An exception will be thrown. 

D. Compilation fails due to error at line 3. 

E. Compilation tails due to error at line 4. 

Answer:

Explanation: 

Option E is the correct answer. Code fails to compile because there is no method called concert in StringBuilder class. The concert method is in String class. Hence option E is correct Here we should have used append method of StringBuilder class, in that case option B would be correct. https://docs.oracle.com/javase/tutorial/java/data/buffers.html 


Q29. You are developing a banking module. You have developed a class named ccMask that has a maskcc method. 

Given the code fragment:

You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits). 

Which two code fragments should you use at line n1, independently, to achieve this requirement? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: B,C 


Q30. Given: 

What is the result? 

A. 2 4 6 8 10 12 

B. 2 4 6 8 10 12 14 

C. Compilation fails 

D. The program prints multiple of 2 infinite times 

E. The program prints nothing 

Answer: