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17. In an interface. can have concrete as well as abstract method all methods need to be concrete all methods need to be abstract except a concrete constructor all methods need to be abstract

17. In an interface. can have concrete as well as abstract method all methods need to be concrete all methods need to be abstract except a concrete constructor all methods need to be abstract

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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only write the answers. Explanation is not needed. thank You.

17. In an interface can have concrete as well as abstract method all methods need to be concrete all methods need to be abstract except a concrete constructor all methods need to be abstract 18. Which of these methods are used to register a keyboard event listener? - addkeylistener() addActionListenero Keyboardlistenero addkeyboardlistener) 19. Which among the following is false? Objects can be passed by reference Object must be created before using members of a class Memory for an object is allocated only after its constructor is called Objects size does not depend on its class data members 20. Which is private member functions access scope? Member functions which are accessible in derived class Member functions which can't be accessed inside the class Member functions which can only be used within the class Member functions which can be used outside the class 21. In a java program, a class contain a function named "hello0". Which among the following declaration of function will make it inaccessible outside of the class in same package? protected void hello0 static void hello() protected void showo void hello0
Transcribed Image Text:17. In an interface can have concrete as well as abstract method all methods need to be concrete all methods need to be abstract except a concrete constructor all methods need to be abstract 18. Which of these methods are used to register a keyboard event listener? - addkeylistener() addActionListenero Keyboardlistenero addkeyboardlistener) 19. Which among the following is false? Objects can be passed by reference Object must be created before using members of a class Memory for an object is allocated only after its constructor is called Objects size does not depend on its class data members 20. Which is private member functions access scope? Member functions which are accessible in derived class Member functions which can't be accessed inside the class Member functions which can only be used within the class Member functions which can be used outside the class 21. In a java program, a class contain a function named "hello0". Which among the following declaration of function will make it inaccessible outside of the class in same package? protected void hello0 static void hello() protected void showo void hello0
22. Private member functions Cannot be accessed from enclosing/outer class Can be accessed from enclosing/outer class Can be accessed only if inner class is private Can be accessed only if inner class is public 23. We cannot make main() function to be private? True False 24. Whether there arise or not an Exception in try block, following always executes (if present with the try block) A finally block after System.exit(0); is executed A finally block with catching exception matched with the exception thrown in try block A catch block with catching exception matched with the exception thrown in try block A finally block when System.exit(0); is not executed in catch block
Transcribed Image Text:22. Private member functions Cannot be accessed from enclosing/outer class Can be accessed from enclosing/outer class Can be accessed only if inner class is private Can be accessed only if inner class is public 23. We cannot make main() function to be private? True False 24. Whether there arise or not an Exception in try block, following always executes (if present with the try block) A finally block after System.exit(0); is executed A finally block with catching exception matched with the exception thrown in try block A catch block with catching exception matched with the exception thrown in try block A finally block when System.exit(0); is not executed in catch block
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