Tag: programming languages

Questions Related to programming languages

class Abc { static { System.out.print("Static block "); display(); } public void display() { System.out.print("Display block "); } public static void main(String a[]) { System.out.print("Starting of Main block "); Abc abc=new Abc(); System.out.print("In the Main block "); abc.display(); } }
technology programming languages

  1. Starting of Main block Static block In the Main block Display block

  2. Static block Display block Starting of Main block In the Main block Display block

  3. Error: Non static method cannot accessed from static context

  4. Starting of Main block In the Main block Display block

Show answer
Correct Option: B

Given: classA {} class B extends A {} class C extends A {} class D extends B {} Which three statements are true? (Choose three.)
technology programming languages

  1. The type List is assignable to List.

  2. The type List is assignable to List>.

  3. The type List is assignable to List extends B>.

  4. The type List extends A> is assignable to List.

  5. The type List is assignable to any List reference.

  6. The type List extends B> is assignable to List extends A>.

Show answer
Correct Option: B,C,F

class Sub extends Super{ String name; Sub(String s) { super(s); name=s; } public static void main(String args[]){ Super sup = new Super("First"); Sub sub = new Sub("Second"); System.out.println(sub.name + " " + sup.name); } } class Super{ String name; Super(String s){ name =s ; } }

technology programming languages

  1. Error: Super(java.lang.String) in Super cannot be applied to ()

  2. First Second

  3. Second First

  4. Runtime Exception

Show answer
Correct Option: C

Given: 1. package com.company.application; 2. 3. public class MainClass { 4. public static void main(String[] args) { } 5. } And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to “.“ (current directory). Which two java commands entered at the command line will run MainClass? (Choose two.) A. java MainClass if run from the /apps directory B. java com.company.application.MainClass if run from the /apps directory C. java -classpath /apps com.company.application.MainClass if run from any directory D. java -classpath . MainClass if run from the /apps/com/company/application directory E. java -classpath /apps/com/company/application:. MainClass if run from the /apps directory F. java com.company.application.MainClass if run from the /apps/com/company/application directory
technology programming languages

  1. A

  2. B

  3. C

  4. D

  5. E

  6. F

Show answer
Correct Option: B,C

Click the Exhibit button. 10. class Inner { 11. private int x; 12. public void setX( int x) { this.x = x; } 13. public int getX() { return x; } 14. } 15. 16. class Outer { 17. private Inner y; 18. public void setY( Inner y) { this.y = y; } 19. public Inner getY() { return y; } 20. } 21. 22. public class Gamma { 23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner(); 26.int n=10; 27. i.setX(n); 28. o.setY(i); 29. // insert code here 30. System.out.println( o.getY().getX()); 31. } 32. } Which three code fragments, added individually at line 29, produce the output 100? (Choose three.)
technology programming languages

  1. n = 100;

  2. i.setX( 100);

  3. o.getY().setX( 100);

  4. i = new Inner(); i.setX( 100);

  5. o.setY( i); i = new Inner(); i.setX( 100);

  6. i = new Inner(); i.setX( 100); o.setY( i);

Show answer
Correct Option: B,C,F

Given: 1. public class Threads2 implements Runnable { 2. 3. public void nun() { 4. System.out.println(”run.”); 5. throw new RuntimeException(”Problem”); 6. } 7. public static void main(String[] args) { 8. Thread t = new Thread(new Threads2()); 9. t.start(); 10. System.out.println(”End of method.”); 11. } 12. } Which two can be results? (Choose two.) A. java.lang.RuntimeException: Problem B. run. java.lang.RuntimeException: Problem C. End of method. java.lang.RuntimeException: Problem D. End of method. run. java.lang.RuntimeException: Problem E. run. java.lang.RuntimeException: Problem End of method.

technology programming languages

  1. A

  2. B

  3. C

  4. D

  5. E

Show answer
Correct Option: D,E

AI Explanation

To answer this question, let's analyze the given code:

1. public class Threads2 implements Runnable {
2.
3. public void run() {
4.     System.out.println("run.");
5.     throw new RuntimeException("Problem");
6. }
7.
8. public static void main(String[] args) {
9.     Thread t = new Thread(new Threads2());
10.    t.start();
11.    System.out.println("End of method.");
12. }
13.
}

The code defines a class Threads2 that implements the Runnable interface. It has a run() method that prints "run." and throws a RuntimeException with the message "Problem". In the main() method, a new Thread is created with an instance of Threads2 and started. It also prints "End of method.".

Now let's go through each option to determine which ones can be the result:

Option A) A. java.lang.RuntimeException: Problem This option is correct because the run() method throws a RuntimeException with the message "Problem". This exception will be caught by the JVM, and the stack trace will be printed, resulting in the output java.lang.RuntimeException: Problem.

Option B) B. run. This option is incorrect because it only includes the output "run.". The code also prints "End of method." after starting the thread.

Option C) C. End of method. This option is incorrect because it only includes the output "End of method.". The code also throws a RuntimeException in the run() method, which will be caught by the JVM.

Option D) D. End of method. run. java.lang.RuntimeException: Problem This option is correct because it includes all the possible outputs. The code first prints "End of method.", then starts the thread, which executes the run() method and prints "run.". Finally, the exception is thrown and caught by the JVM, resulting in the output java.lang.RuntimeException: Problem.

Option E) E. run. java.lang.RuntimeException: Problem End of method. This option is correct because it includes all the possible outputs, but in a different order. The code first starts the thread, which executes the run() method and prints "run.". Then, the exception is thrown and caught by the JVM, resulting in the output java.lang.RuntimeException: Problem. Finally, "End of method." is printed.

Therefore, the correct answers are options D and E.

Given: 1. public class TestString3 { 2. public static void main(String[] args) { 3. // insert code here 5. System.out.println(s); 6. } 7. } Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.) A. String s = “123456789”; s = (s-”123”).replace(1,3,”24”) - “89”; B. StringBuffer s = new StringBuffer(”123456789”); s.delete(0,3).replace( 1,3, “24”).delete(4,6); C. StringBuffer s = new StringBuffer(”123456789”); s.substring(3,6).delete( 1 ,3).insert( 1, “24”); D. StringBuilder s = new StringBuilder(”123456789”); s.substring(3,6).delete( 1 ,2).insert( 1, “24”); E. StringBuilder s = new StringBuilder(”123456789”); s.delete(0,3).delete( 1 ,3).delete(2,5).insert( 1, “24”);
technology programming languages

  1. A

  2. B

  3. C

  4. D

  5. E

Show answer
Correct Option: B,E

Click the Exhibit button. 1. public class A { 2. public void method1() { 3. B b=new B(); 4. b.method2(); 5. // more code here 6. } 7. } 1. public class B { 2. public void method2() { 3.C c=new C(); 4. c.method3(); 5. // more code here 6. } 7. } 1. public class C { 2. public void method3() { 3. // more code here 4. } 5. } Given: 25. try { 26. A a=new A(); 27. a.method1(); 28. } catch (Exception e) { 29. System.out.print(”an error occurred”); 30. } Which two are true if a NullPointerException is thrown on line 3 of class C? (Choose two.)
technology programming languages

  1. The application will crash.

  2. The code on line 29 will be executed.

  3. The code on line 5 of class A will execute.

  4. The code on line 5 of class B will execute.

  5. The exception will be propagated back to line 27.

Show answer
Correct Option: B,E

Given: 33. try { 34. // some code here 35. } catch (NullPointerException e1) { 36. System.out.print(”a”); 37. } catch (RuntimeException e2) { 38. System.out.print(”b”); 39. } finally { 40. System.out.print(”c”); 41. } What is the result if a NullPointerException occurs on line 34?
technology programming languages

  1. c

  2. a

  3. ab

  4. ac

  5. bc

  6. abc

Show answer
Correct Option: D
  1. Given: 10. class One { 11. public One foo() { return this; } 12. } 13. class Two extends One { 14. public One foo() { return this; } 15. } 16. class Three extends Two { 17. // insert method here 18. } Which two methods, inserted individually, correctly complete the Three class? (Choose two.)
technology programming languages

  1. public void foo() { }

  2. public int foo() { return 3; }

  3. public Two foo() { return this; }

  4. public One foo() { return this; }

  5. public Object foo() { return this; }

Show answer
Correct Option: C,D