What does scanner sc mean in java?

Scanner sc is the variable name of the Scanner class in Java used to read user input. It allows programs to read text and data, such as strings, numbers, and Boolean values, from the System.in input stream.

The meaning of scanner sc in Java

Scanner class in Java is used to read from Read text or data from user input. It is typically used with a System.in input stream, allowing a program to interpret user input as a sequence of tokens.

Specifically, sc is the variable name of a Scanner class. In a Java program, this variable can be used to represent the Scanner object associated with System.in.

Usage

1. Initialize Scanner object

Scanner sc = new Scanner(System.in);

2. Read user input

String input = sc.nextLine(); // 读取一行文本
int number = sc.nextInt(); // 读取一个整数
double value = sc.nextDouble(); // 读取一个浮点数

3. Close the Scanner object

sc.close(); // 关闭 Scanner 对象，释放资源

Advantages

Using the Scanner class has the following advantages:

• Simplify user input processing
• Allow multiple data types to be input
• Support string, number and Boolean value input

Example

The following is a simple example of reading user input and printing:

import java.util.Scanner;

public class ScannerExample {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入您的姓名：");
        String name = sc.nextLine();

        System.out.println("请输入您的年龄：");
        int age = sc.nextInt();

        System.out.println("您的姓名是 " + name + "，您的年龄是 " + age);

        sc.close();
    }
}

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