如何在Java中逐行输入字符串或每行输入50个字符

import java.util.Scanner;

public class InputString {

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

        System.out.println("请输入字符串（按回车键结束输入）：");

        // 逐行输入字符串
        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();

            // 每行输入50个字符
            for (int i = 0; i < line.length(); i += 50) {
                int endIndex = Math.min(i + 50, line.length());
                String substring = line.substring(i, endIndex);
                System.out.println(substring);
            }
        }

        scanner.close();
    }
}