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Nonamiya [84]
3 years ago
6

Consider the following code: public static void mystery(int a) { System.out.println("A"); } public static void mystery(double a)

{ System.out.println("B"); } public static void mystery(int a, double b) { System.out.println("C"); } public static void mystery(double a, int b) { System.out.println("D"); } What is output by the following? mystery(7);
Computers and Technology
1 answer:
Feliz [49]3 years ago
3 0

Answer:

The output is "A"

Explanation:

public class Solution {

   public static void main(String args[]) {

     mystery(7);

   }    

   public static void mystery(int a) { System.out.println("A"); }    

   public static void mystery(double a) { System.out.println("B"); }    

   public static void mystery(int a, double b) { System.out.println("C"); }    

   public static void mystery(double a, int b) { System.out.println("D"); }

}

In the code above; mystery is defined in four different ways called method overloading. Method overloading is when same method is defined with different parameters.

In the first case; mystery will be called if the argument is int.

In the second case; mystery will be called if the argument is double.

In the third case; mystery will be called if the arguments are int and double.

In the fourth case; mystery will be called if the arguments are double and int.

When mystery(7) is called; the mystery method requiring only int will be called and the output is "A".

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As previously mentioned, for every i-loop, there would be an n amount of executions. So if the i-loop is called an n amount of times by the j loop (which executes n times), the big-O notation would be O(n*n), or O(n^2). 

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A way to verify this is to write and test program the above. I sometimes find it easier to wrap my head around concepts after testing them myself.
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8 0
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As a twist on the Hello World exercise, you are going to be the end user of the Hello class. This class is designed to greet the
Flura [38]

Answer:

Here is the Hello class:

public class Hello { //class name

     private String name; //to store the name

     

      public Hello (String names) //parameterized constructor

      { name = names;  }  

     

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           System.out.print("Hello "); //displays Hello on output screen

           System.out.print(name); //displays user name

           System.out.println("!");  }  //displays exclamation mark symbol

           

           public void Spanish(){ //method to greet user in spanish

               System.out.print("Hola "); //displays Hello on output screen

               System.out.print(name); //displays user name

               System.out.println("!"); } //displays exclamation mark symbol

           

         public void French() { //method to greet user in french

              System.out.print("Bonjour "); //displays Hello on output screen

              System.out.print(name);  //displays user name

              System.out.println("!");  } } //displays exclamation mark symbol

           

Explanation:

Here is the HelloTester class:

import java.util.Scanner; //to accept input from user

public class HelloTester { //class name

 public static void main (String[]args)  { //start of main method

String name; //to store the name of user

Scanner input = new Scanner(System.in);  //creates Scanner class object

System.out.println("Enter name?" );  //prompts user to enter name

 name = input.nextLine(); //scans and reads the name from user

 Hello hello = new Hello(name); //creates Hello class object and calls constructor by passing name

hello.English(); //calls English method using object hello to greet in english

hello.Spanish(); //calls Spanish method using object hello to greet in spanish

hello.French(); } }  //calls French method using object hello to greet in french

The output of the program is:

Enter name?                                                                                                                    user                                                                                                                           Hello user!                                                                                                                    Hola user!                                                                                                                    Bonjour user!  

The screenshot of the program along with its output is attached.

4 0
3 years ago
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