How Java Handles User Input and Text Processing

  In Java, programs rarely work with fixed values alone. Most applications need to accept input and then process that input in a meaningful way. To handle these tasks, Java provides different classes instead of mixing everything into one place. Two commonly used classes for this purpose are Scanner and StringTokenizer . One focuses on reading input, and the other focuses on breaking text into smaller parts. Reading Input in Java The Scanner class is used to read input in Java. It belongs to the java.util package and is most often used with System.in to take input from the keyboard. Scanner makes input handling simple because it can directly read different data types instead of treating everything as plain text. Some commonly used Scanner methods are: nextInt() – reads an integer nextDouble() – reads a decimal value next() – reads a single word nextLine() – reads a complete line of text A common point of confusion is the difference between next() and nextLine()...