Tag: web technology

Questions Related to web technology

Controller in PS Framework is
technology web technology

  1. ps.xml

  2. Action controller

  3. JSP file

  4. Servlet

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Correct Option: A,B

Which one does not extend java.lang.Number
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  1. Integer

  2. Boolean

  3. Character

  4. Long

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Correct Option: A,B
Explanation:

To solve this question, the user needs to know the concepts of inheritance and the java.lang.Number class. The java.lang.Number class is the superclass of all classes that encapsulate numbers in Java. These classes include Integer, Double, Long, Byte, Float, and Short.

Now, let's go through each option and explain why it extends or does not extend java.lang.Number:

A. Integer: This option extends java.lang.Number. Integer is a class that represents a 32-bit signed integer. It is a subclass of java.lang.Number and inherits its methods.

B. Boolean: This option does not extend java.lang.Number. Boolean is a class that represents a boolean value, which is either true or false. It does not inherit from java.lang.Number.

C. Character: This option does not extend java.lang.Number. Character is a class that represents a single character. It does not inherit from java.lang.Number.

D. Long: This option extends java.lang.Number. Long is a class that represents a 64-bit signed integer. It is a subclass of java.lang.Number and inherits its methods.

Therefore, the answer is:

The Answer is: B

Given: class Top { public Top(String s) { System.out.print("B"); } } public class Bottom2 extends Top { public Bottom2(String s) { System.out.print("D"); } public static void main(String [] args) { new Bottom2("C"); System.out.println(" "); } } What is the result?
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  1. BD

  2. DB

  3. BDC

  4. DBC

  5. Compilation fails

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Correct Option: E

Which statement(s) are true? (Choose all that apply.)
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  1. Cohesion is the OO principle most closely associated with hiding implementation details

  2. Cohesion is the OO principle most closely associated with making sure that classes know about other classes only through their APIs

  3. Cohesion is the OO principle most closely associated with making sure that a class is designed with a single, well-focused purpose

  4. Cohesion is the OO principle most closely associated with allowing a single object to be seen as having many types

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Correct Option: C

Given: 3. class Mammal { 4. String name = "furry "; 5. String makeNoise() { return "generic noise"; } 6. } 7. class Zebra extends Mammal { 8. String name = "stripes "; 9. String makeNoise() { return "bray"; } 10. } 11. public class ZooKeeper { 12. public static void main(String[] args) { new ZooKeeper().go(); } 13. void go() { 14. Mammal m = new Zebra(); 15. System.out.println(m.name + m.makeNoise()); 16. } 17. } What is the result?
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  1. furry bray

  2. stripes bray

  3. furry generic noise

  4. stripes generic noise

  5. Compilation fails

  6. An exception is thrown at runtime

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Correct Option: A

Given: ClassA has a ClassD Methods in ClassA use public methods in ClassB Methods in ClassC use public methods in ClassA Methods in ClassA use public variables in ClassB Which is most likely true? (Choose the most likely.)
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  1. ClassD has low cohesion

  2. ClassA has weak encapsulation

  3. ClassB has weak encapsulation

  4. ClassB has strong encapsulation

  5. ClassC is tightly coupled to ClassA

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Correct Option: C

Given: 3. import java.io.*; 4. public class ReadingFor { 5. public static void main(String[] args) { 6. String s; 7. try { 8. FileReader fr = new FileReader("myfile.txt"); 9. BufferedReader br = new BufferedReader(fr); 10. while((s = br.readLine()) != null) 11. System.out.println(s); 12. br.flush(); 13. } catch (IOException e) { System.out.println("io error"); } 16. } 17. } And given that myfile.txt contains the following two lines of data: ab cd What is the result?
technology web technology

  1. ab

  2. abcd

  3. ab cd

  4. a b c D

  5. Compilation fails

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Correct Option: E

Which is true? (Choose all that apply.)
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  1. "X extends Y" is correct if and only if X is a class and Y is an interface

  2. "X extends Y" is correct if and only if X is an interface and Y is a class

  3. "X extends Y" is correct if X and Y are either both classes or both interfaces

  4. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces

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Correct Option: C

Given: 3. class A { } 4. class B extends A { } 5. public class ComingThru { 6. static String s = "-"; 7. public static void main(String[] args) { 8. A[] aa = new A[2]; 9. B[] ba = new B[2]; 10. sifter(aa); 11. sifter(ba); 12. sifter(7); 13. System.out.println(s); 14. } 15. static void sifter(A[]... a2) { s += "1"; } 16. static void sifter(B[]... b1) { s += "2"; } 17. static void sifter(B[] b1) { s += "3"; } 18. static void sifter(Object o) { s += "4"; } 19. } What is the result?
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  1. -124

  2. -134

  3. -424

  4. -434

  5. -444

  6. Compilation fails

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Correct Option: D

Given: 3. public class Wind { 4. public static void main(String[] args) { 5. foreach: 6. for(int j=0; j<5; j++) { 7. for(int k=0; k< 3; k++) { 8. System.out.print(" " + j); 9. if(j==3 && k==1) break foreach; 10. if(j==0 || j==2) break; 11. } 12. } 13. } 14. } What is the result?
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  1. 0 1 2 3

  2. 1 1 1 3 3

  3. 0 1 1 1 2 3 3

  4. 1 1 1 3 3 4 4 4

  5. 0 1 1 1 2 3 3 4 4 4

  6. Compilation fails

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Correct Option: C
Explanation:

To solve this question, the user needs to understand how the nested for loops work and the use of break statements inside loops.

The code starts with a nested for loop. The outer loop iterates over values of j from 0 to 4, while the inner loop iterates over values of k from 0 to 2. Inside the inner loop, the code prints the value of j and checks two conditions using if statements:

  • If j is equal to 3 and k is equal to 1, the code executes a break statement with the label "foreach", which causes the program to exit both loops and continue executing after line 13.
  • If j is equal to 0 or 2, the code executes a break statement, which only exits the inner loop and continues executing from line 12.

Now, let's go through each option and find the correct answer:

A. 0 1 2 3:

This option is incorrect. The inner loop will only execute when j is equal to 1 or 3, and k is less than 3. When j is equal to 3 and k is equal to 1, the program exits both loops and does not print any more values. Thus, the correct output should not include 4.

B. 1 1 1 3 3:

This option is incorrect. The inner loop will only execute when j is equal to 1 or 3, and k is less than 3. When j is equal to 3 and k is equal to 1, the program exits both loops and does not print any more values. Thus, the correct output should not include 1 or 2.

C. 0 1 1 1 2 3 3:

This option is correct. The inner loop will only execute when j is equal to 1 or 3, and k is less than 3. When j is equal to 3 and k is equal to 1, the program exits both loops and does not print any more values. Thus, the correct output is 0 1 1 1 2 3 3.

D. 1 1 1 3 3 4 4 4:

This option is incorrect. The program never prints the value 4, since the outer loop only iterates from 0 to 4. When j is equal to 3 and k is equal to 1, the program exits both loops and does not print any more values. Thus, the correct output should not include 1 or 2.

E. 0 1 1 1 2 3 3 4 4 4:

This option is incorrect. The program never prints the value 4, since the outer loop only iterates from 0 to 4. When j is equal to 3 and k is equal to 1, the program exits both loops and does not print any more values. Thus, the correct output should not include 1, 2, or 4.

F. Compilation fails:

This option is incorrect. The code compiles without errors.

Therefore, the correct answer is:

The answer is: C. 0 1 1 1 2 3 3.