How to use scan in java

The Scanner class provides a simplified way to read data and can parse data types such as strings, integers, floating point numbers, and Boolean values ​​from the input stream. Usage steps: 1. Create a Scanner object and specify the input source. 2. Use next(), nextInt() and other methods to read data. 3. Process the read data. 4. Use the close() method to release resources. The advantages of the Scanner class include: process simplification, efficiency, and support for multiple input sources.

Scanner Usage in Java

The Scanner class is used in Java to read data from an input stream such as the keyboard or a file. ) to read text and basic data. It provides convenient methods to parse various data types, including strings, integers, floats, and booleans.

Usage

To use the Scanner class, you need to follow the following steps:

1. Create a Scanner object and specify the input to be read Source (eg System.in for keyboard input).
2. Use the Scanner object's methods (such as next(), nextInt()) to read data.
3. Process the read data.
4. Use the close() method to close the Scanner object and release resources.

Example

The following code example demonstrates how to use the Scanner class to read an integer from the keyboard:

import java.util.Scanner;

public class ScannerExample {

    public static void main(String[] args) {
        // 创建一个 Scanner 对象，读取键盘输入
        Scanner scanner = new Scanner(System.in);

        // 读取一个整数
        int number = scanner.nextInt();

        // 打印读取的整数
        System.out.println("读取的整数为：" + number);

        // 关闭 Scanner 对象
        scanner.close();
    }
}

Method

The Scanner class provides many methods to parse different types of data, including:

• next(): Read the next string
• nextInt(): Read the next integer
• nextDouble(): Read the next floating point number
• nextBoolean(): Read the next Boolean value
• hasNext(): Check if there is more data in the input stream

Advantages

The advantages of using the Scanner class to read input data include:

• Simplified process: Provides a convenient and consistent way to read various data types.
• Efficiency: Compared with other methods of reading input, the Scanner class is more efficient.
• Flexible: Data can be read from various input sources (such as keyboard, files, strings).

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