Java uses the useDelimiter() function of the Scanner class to set the delimiter of the input stream

Java uses the useDelimiter() function of the Scanner class to set the delimiter of the input stream

The Scanner class is a tool class commonly used in Java to read keyboard input or read file content. When processing the input stream Sometimes, we sometimes need to split the input stream according to the specified delimiter. This requires using the useDelimiter() function of the Scanner class to set the delimiter of the input stream.

The useDelimiter() function is a method of the Scanner class, which is used to set the delimiter of the input stream. By default, the Scanner class uses whitespace characters as delimiters, including spaces, tabs, newlines, etc. But sometimes we may need to use other characters or strings as delimiters, which requires using the useDelimiter() function to set it.

The following is a sample code that demonstrates how to use the useDelimiter() function of the Scanner class to set the delimiter of the input stream:

import java.util.Scanner;

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

        // 设置输入流的分隔符为逗号
        scanner.useDelimiter(",");

        // 读取输入流内容并打印输出
        while (scanner.hasNext()) {
            String input = scanner.next();
            System.out.println("输入内容：" + input);
        }

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

In the above code, we first create a Scanner object scanner, used to read keyboard input. Then use the line scanner.useDelimiter(",") to set the delimiter of the input stream to a comma. Then use a while loop to read the contents of the input stream, and use the scanner.next() method to obtain each input item. Finally, print out each input item.

When running the program using the above code, the delimiter of the input stream is set to comma. When we enter multiple items, commas need to be used to separate each item. For example, after entering "apple,banana,orange", the program will output "apple", "banana" and "orange" respectively.

In addition to using a single character as a delimiter, we can also use a string as a delimiter. For example, you can use scanner.useDelimiter("|") to set the input stream's delimiter to a vertical bar, or use scanner.useDelimiter("\s ") to set the input stream's delimiter to multiple consecutive whitespace characters.

In short, using the useDelimiter() function of the Scanner class can easily set the delimiter of the input stream so that the input stream can be split according to the specified delimiter. By setting different delimiters, we can process the content of the input stream more flexibly and improve the applicability and flexibility of the program. I hope this article can help you use the Scanner class in Java programming.

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