Consider the array declaration and initialization: double []x = new double [6];

Question

Consider the array declaration and initialization: double []x = new double [6]; x[] = {12, -1, 15, 3, 99, -5}; (a) What is the type of x[6]? (b) What is the value of x length? (c) What is the value of x[4]? (d) What is the largest index i such that x[i] is valid? (e) What is the value of smallest valid index of x[i]? Suppose you are designing a class. (a) Another name for the getters is _____? (b) Methods of a class are called class _____ (c) The method with the class name and no return type is _____ (c) (d) Other than the constructor, getters & setters you need a _____ (e) The methods that update the objects data values are _____? What is the output of this program? public class Q_08 {public static void main(String[] args) {int x = 2 for(int i = 1; i

Explanation / Answer

5) Question:

    a) Accessor Methods

          Accessor Methods are also called Getters

    b) Instance Methods

       Instance Methods are accessed by object only, which is instance of class.

    c) Constructor

        Whenever object is created constructor is called, hence the return type of that is always Object type.

    d) Instance Variables, Blocks , main method() and object

       A class contains, Properties, Methods, Constructors, Blocks.

e) Setters

        Setters are also called Mutators

Example:

public class Student {

   String id,name; // Properties
    //Constructor
   public Student(String id,String name){
       this.id = id;
       this.name = name;
   }

    //Getters

   public String getId() {
       return id;
   }

   //Setters

   public void setId(String id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

static { // Block

    System.out.println("Student Info");

}
}

6) Question:

public class Q_08 {

   public static void main(String[] args) {
      
       int x=2;
       for(int i=1;i<=5;i++){
           x=i%x;
           System.out.println("i="+i+" x="+x);
       }
       System.out.println("The final answer is:"+x);
   }

}

Output:

i=1   x=1
i=2   x=0
Exception in thread "main" java.lang.ArithmeticException: / by zero

Explaination:

   For the first iteration of loop when i=1, x=2, x = i%x, the x=1

   So, it prints i=1   x=1

   For the second iteration of loop when i=2, x=1, x = i%x, the x=0

   So, it prints i=2 x=0

   For the third iteration of loop when i=2, x=0, x = i%x, the x=Undetermined

   Since, Divide By Zero is undetermined, and Java JRE throws RuntimeException called ArithmeticException

4) Question

   If we consider the given question stores array of 6 double values, the below are the answers for them:

        double []x = new double[6];
       x[] = {12,-1,15,3,99,-5}; //Invalid Syntax in Java

            OR

       double []x = new double[] {12,-1,15,3,99,-5}; //Valid One

a) There will be no 6th Value, since array starts from 0 to n-1, it throws ArrayIndexOutOfBoundsException

b) The value of x.length is 6

c) The value of x[4] is 99.0

d) The Largest Valid index is 5

e) The smallest valid Index is 0

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