Technology problems
- 1. Which of the following method declarations are allowed inside interface?
Options- A. public void m1()
- B. private void m1()
- C. protected void m1()
- D. abstract public void m1() Also asked in: IT Trainer
Correct Answer: abstract public void m1()
Explanation:
Inside an interface every method will be by default abstract and public
- 2. Why interface method is always public? Also asked in: IT Trainer
Correct Answer: To make this method available to every implementation class
- 3. Which among the following is a scope resolution operator?
Options- A. :
- B. ::
- C. :?
- D. None Also asked in: Software Architect
Correct Answer: ::
Explanation:
:: is the scope resolution operator
- 4. Which kind of inheritance is not supported directly through classes in java?
Options- A. Multilevel
- B. Multiple
- C. Single
- D. Hirarcheal Also asked in: Software Architect
Correct Answer: Multiple
Explanation:
Multiple inheritance is not supported directly but it is achieved through the concept of Interface
- 5. public class Threads2 implements Runnable { public void run() { System.out.println("run."); throw new RuntimeException("Problem"); Which among the following is true? } public static void main(String[] args) { Thread t = new Thread(new Threads2()); t.start(); System.out.println("End of method."); } }
Options- 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 Discuss
Correct Answer: End of method. run. java.lang.RuntimeException: Problem
Explanation:
Only D can be true
- 6. public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?
Options- A. public class Circle implements Shape { private int radius;
- B. public abstract class Circle extends Shape { private int radius; }
- C. public class Circle extends Shape { private int radius; public void draw();
- D. None Discuss
Correct Answer: public abstract class Circle extends Shape { private int radius; }
Explanation:
Only B is true
- 7. public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?
Options- A. public class Circle implements Shape { private int radius;
- B. public abstract class Circle extends Shape { private int radius; }
- C. public class Circle extends Shape { private int radius; public void draw();
- D. None Discuss
Correct Answer: public abstract class Circle extends Shape { private int radius; }
Explanation:
Only B is true
- 8. X implements Y, Z Arguments: 1. X should be class 2. Y, Z should be interfaces
Options- A. Only 1 is true
- B. Only 2 is true
- C. Both 1 and 2 are true
- D. None Also asked in: IT Trainer
Correct Answer: Both 1 and 2 are true
Explanation:
Both the statements are true
- 9. What is a class, member and local variable? Discuss
Correct Answer: Variables declared within a method are local variables Variables declared within the class are member variables Variables declared within the class with static modifier are class variables
- 10. What is JDBC Driver ? Discuss
Correct Answer: The JDBC Driver provides vendor-specific implementations of the abstract classes provided by the JDBC API This driver is used to connect to the database
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