programming in java questions and answers 2023/2024

1. What output is produced by the following lines? String s = "Hello" + "Joe"; Sln(s); 2. Write Java statements that will cause the following to be written to the screen: One two buckle your shoe. Three four shut the door. 3. What is the difference between Sln and S ? 4. What is the o...

Exam (elaborations) programming in java

Exam (elaborations) java

1. In the array declaration String[] word = new String[5]; what is a. the array name? b. the base type? c. the length of the array? d. the range of values an index accessing this array can have? e. one of the indexed variables (or elements) of this array? 2. In the array double [] score = n...

Inheritance 1. Suppose the class named DiscountSale is a derived class of a class called Sale . Suppose the class Sale has instance variables named price and numberOfItems . Will an object of the class DiscountSale also have instance variables named price and numberOfItems ? 2. Suppose the clas...

1. Explain the difference between the terms late binding and polymorphism . 2 . Suppose you modify the definitions of the class Sale ( Display 8.1 ) by adding the modifier final to the definition of the method bill . How would that change the output of the program in Display 8.3 ? 3. Would it be...

java Exception Handling

java File I/O 1. A stream is a flow of data. From where and to where does the data flow in an input stream? From where and to where does the data flow in an output stream? 2. What is the difference between a binary file and a text file? 3. What kind of exception might be thrown by the following, ...

Recursion 1. What is the output of the following program? public class Exercise1 { public static void main(String[] args) { cheers(3); } public static void cheers( int n) { if (n == 1) { Sln("Hurray"); } else { Sln("Hip"); cheers(n – 1); } } }

Exam (elaborations) UML and Patterns in java

1.Can you have a variable of an interface type? Can you have a parameter of an interface type? 2. Can an abstract class ever implement an interface? 3. Can a derived class have two base classes? Can it implement two interfaces? 4. Can an interface implement another interface?

Generics and the ArrayList Class in java 1. Suppose list is an object of the class ArrayList<String> . How do you add the string "Hello" to the ArrayList list ? 2. Suppose instruction is an object of the class ArrayList<String> that contains the string "Stop" at index position 5 ...

Linked Data Structures 1. What output is produced by the following code? LinkedList1 list = new LinkedList1( ); ToStart("apple pie", 1); ToStart("hot dogs", 12); ToStart("mustard", 1); tList( );

1. Give the definition of a boolean valued static generic method named inSome . The method inSome has two parameters of type Collection<T> and one parameter of type T . The method returns true if the parameter of type T is in either (or both) collections; it returns false otherwise. 2. Giv...