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Write about Java scanner class
PROGRAM: Java scanner class
/* Java scanner class */
Java Scanner Class – Explanation, Syntax & Example Program
The Scanner class in Java is used to take input from the user.
It can read data like integers, strings, doubles, float, characters, and more directly from the keyboard.
In simple words:
👉 Scanner class allows your Java program to accept user input.
⭐ What is Scanner Class?
The Scanner class is part of java.util package.
It provides methods to read different types of values from:
-
Keyboard (most common)
-
Files
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Strings
To use it, you must import it first.
📌 Importing Scanner Class
This line tells Java that you want to use the Scanner class.
🧩 Syntax of Scanner Class
-
Scanner→ class name -
sc→ object name (you can choose any name) -
new Scanner()→ creates the Scanner object -
System.in→ takes input from keyboard
🔍 Common Scanner Methods
| Method | Description |
|---|---|
nextInt() |
Reads an integer |
nextFloat() |
Reads a float value |
nextDouble() |
Reads a double value |
next() |
Reads a single word |
nextLine() |
Reads a full line (including spaces) |
nextBoolean() |
Reads true/false |
nextLong() |
Reads long value |
nextShort() |
Reads short value |
🖥️ Example Program Using Scanner Class
Here is a simple program that takes name and age from the user:
🔍 Line-by-Line Explanation
import java.util.Scanner;
This imports the Scanner class for user input.
Scanner sc = new Scanner(System.in);
Creates a Scanner object named sc to take input from keyboard.
String name = sc.nextLine();
Reads a full line (name can include spaces).
int age = sc.nextInt();
Reads an integer value for age.
sc.close();
Closes the Scanner to free resources.
⭐ Uses of Scanner Class
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Accepting form-like inputs
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Taking choices in menu-driven programs
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Reading numbers in math-based programs
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Reading strings, characters, and boolean values
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Beginner-friendly user interaction
