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.