The role of scanner in java

The Scanner class in Java is used to read data from the input stream. It provides multiple functions: Reading basic data types (integers, floats, booleans, strings) Separating data by delimiters Matching data by literals Reading multi-line data Handling input exceptions

The role of Scanner in Java

The Scanner class is a standard class in Java for reading data from an input stream (such as standard input). It provides a simple and versatile interface that allows programmers to read data from various types of data sources, including consoles, files, and network connections.

Specific function:

• Read basic data types: Scanner class can read basic data types, such as integers and floating point numbers , boolean and string.
• Read delimiter-delimited data: It can read data delimited using delimiters such as spaces, commas, or tabs and read them as strings.
• Read data by literal matching: The Scanner class can also read data by literal matching, allowing programmers to read specific patterns or sequences.
• Read multiple lines of data: It can read multiple lines of data and use the newLine() method to read it as a string.
• Handling input exceptions: Scanner class provides hasNext() and next() methods to check whether data exists and read data, making it easy to handle input exceptions.

Usage example:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        // 创建一个 Scanner 对象，它将从标准输入读取数据
        Scanner scanner = new Scanner(System.in);

        // 读取一个整数，并将其存储在变量中
        int number = scanner.nextInt();

        // 读取一个字符串，并将其存储在变量中
        String name = scanner.nextLine();

        // 打印读取的数据
        System.out.println("整数：" + number);
        System.out.println("字符串：" + name);
    }
}

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