Lecture Notes: Methods in Java

Overview

• Introduction to creating methods in Java.
• Exercise focused on writing methods to get user input: name and age.

Getting Started

• Task: Write a method to get the user's name and another to get the user's age.
• Suggested to pause the video and try the exercise.

Method: getName

• Declaration:
  • public static String getName()
• Steps:
  1. Create a Scanner object to read user input:

     Scanner input = new Scanner(System.in);  
     

  2. Read the user's name:

     String name = input.nextLine();  
     

  3. Return the name:

     return name;  
     

Alternate Code Implementation

• Return the result directly without storing in an intermediate variable:

  return new Scanner(System.in).nextLine();  
  

• Note: If using an object only once, instantiate it directly in the return statement.

Using getName in main Method

• Prompt user for input:

  System.out.print("Enter your name:");  
  System.out.println(getName());  
  

• The method will create a Scanner, read input, and print the name back to the user.

Method: getAge

• Declaration:
  • public static double getAge()
• Steps:
  1. Create a new Scanner object to read user input:

     return new Scanner(System.in).nextDouble();  
     

Using getAge in main Method

• Prompt user for age:

  System.out.print("Enter your age:");  
  

• Concatenate user name and age for output:

  System.out.println(getName() + " " + getAge());  
  

Conclusion

• Demonstrated methods to read user input for name and age in Java.
• Encouraged to try running the program and observe the output.
• Thanks for watching and looking forward to the next video.