Question

Methods and File Output and Exceptions

Outcome:

• Student will demonstrate the ability to write, use and call methods
• Student will demonstrate the ability to pass values to and from methods
• Student will demonstrate the ability to catch exceptions
• Student will demonstrate the ability to create a text file
• Student will demonstrate the ability to validate input data

Program Specifications:

You to write a menu driven program. The program will use a switch statement. The cases will be as follows:

1. Get the user’s first name and echo it back out 20 times.
2. Get the Store user’s age and double it and display the age and the doubled age.
3. Using the age from #2 output one of the following statements
   1. Since you are XX years old, you are a teenager
   2. Since you are XX years old, you are NOT a teenager
4. Get a single integer between 3 and 50 from the user. Create a triangle of X’s with the integer inputted rows. The triangle needs to be displayed on the screen and in a text document named triangle.txt.

Submission Requirements:

• You must follow the rules from the second assignment.

YOU CANNOT:

• Use global variables
• Use the word goto
• Use the break command outside a case statement

Answer 1

Code:

//Menu.java

import java.util.Scanner;

public class Menu {

public static void main(String[] args) {
/*
* Creating an Scanner class object which is used to get the inputs
* entered by the user
*/
Scanner sc = new Scanner(System.in);
int choice;
do
{
System.out.println("\n::MENU::");
System.out.println("1.Echo Name");
System.out.println("2.Double Your Age");
System.out.println("3.Check Teenager or not");
System.out.println("4.Display Triangle");
System.out.println("5.Exit");
System.out.print("Enter Choice:");
choice = sc.nextInt();
switch (choice) {
case 1: {
System.out.print("Enter your name");
String name=sc.nextLine();
for(int i=1;i<=20;i++)
{
System.out.println(name);
}
break;
}
case 2: {
int age;
System.out.print("Enter age :");
age=sc.nextInt();
System.out.println("Your age :"+age);
System.out.println("Doubled age :"+(2*age));
  
  
  
break;
}
case 3: {
int age;
System.out.print("Enter age :");
age=sc.nextInt();
  
if(age>=13 && age<=19)
{
System.out.println("Since you are "+age+" years old.Your are a Teenager");
}
else
{
System.out.println("Since you are "+age+" years old.Your are not a Teenager");
}
break;
}
case 4: {
int rows;
do
{
System.out.print("Enter a number (between 3 and 50):");
rows=sc.nextInt();
if(rows<3 || rows>50)
{
System.out.println("** Invalid.Must be between 3 and 50 **");
}
}while(rows<3 || rows>50);
printTriangle(rows);
break;
}
case 5:{
break;
}
default: {
System.out.println("** Invalid Choice **");
break;
}

}  
}while(choice!=5);
  

}

private static void printTriangle(int size) {
char ch='*';
for (int a = 0; a < 2 * size - 1; a++) {
if (a % 2 == 0) {
for (int b = 0; b < (2 * size - 1) - a; b++) {
System.out.print(" ");
}

for (int c = 0; c <= a; c++) {
System.out.print(ch+" ");
}
System.out.println();
}

}
  
}

}

___________________________

Output:

::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:1
Enter your name:Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams
Williams

::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:2
Enter age :23
Your age :23
Doubled age :46

::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:3
Enter age :16
Since you are 16 years old.Your are a Teenager

::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:4
Enter a number (between 3 and 50):6
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
* * * * * * * * * * *

::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:5

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