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- Question
Which kind of inheritance is not supported directly through classes in java?
Options- A. Multilevel
- B. Multiple
- C. Single
- D. Hirarcheal
- Correct Answer
- Multiple
ExplanationMultiple inheritance is not supported directly but it is achieved through the concept of Interface
- 1. Which among the following is a scope resolution operator?
Options- A. :
- B. ::
- C. :?
- D. None Discuss
- 2. Why interface method is always public? Discuss
- 3. 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() Discuss
- 4. Inside an interface when should the variables be initialized?
Options- A. Globally
- B. Whenever required
- C. Inside a function
- D. During the time of declaration Discuss
- 5. Which of the following statements are equal for a variable declared in the interface ? 1. int X=10 2. public int X=10 3. public static final int X=10
Options- A. Only 1 and 2 are equal
- B. Only 2 and 3 are equal
- C. All are unequal
- D. All are equal Discuss
- 6. 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
- 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
- 8. 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
- 9. 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 Discuss
- 10. What is a class, member and local variable? Discuss
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Search Results
Correct Answer: ::
Explanation:
:: is the scope resolution operator
Correct Answer: To make this method available to every implementation class
Correct Answer: abstract public void m1()
Explanation:
Inside an interface every method will be by default abstract and public
Correct Answer: During the time of declaration
Explanation:
They should be initialized during the time of declaration itself otherwise it is a compilation eror
Correct Answer: All are equal
Explanation:
All the statements are equal because inside an interface a variable declared will be public static final by default
Correct Answer: End of method. run. java.lang.RuntimeException: Problem
Explanation:
Only D can be true
Correct Answer: public abstract class Circle extends Shape { private int radius; }
Explanation:
Only B is true
Correct Answer: public abstract class Circle extends Shape { private int radius; }
Explanation:
Only B is true
Correct Answer: Both 1 and 2 are true
Explanation:
Both the statements are true
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
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