查找句子的中间十个字符+在每行上打印更多文本(Finding the middle ten characters of a sentence + printing more text on each line)

 非常多，我有这段代码。 它打算采取一个句子，并打印每个单词在自己的路线。 它也应该找到一个句子的中间十个字符。 
 
 我的问题是，我不确定如何制作它，以便我实际得到一个句子的中间十个字符。 目前在代码中，它的写法是为了找到最后两位数字。 另外，我想这样做是为了不用只在每行上打印出单词，而是希望它说“第一个词：这个”，“第二个单词：是”等等。 不过，每个人都在一个单独的行上。 任何帮助或指导将非常感激，谢谢！ 
 
import java.util.Scanner;

public class Sentence {

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

        System.out.print("Enter a sentence with 5+ words: ");
        String sentence = in.nextLine();
        System.out.println();

        int space = sentence.indexOf(" ");
        sentence = sentence.substring(0, space) + "\n" + sentence.substring(space + 1);
        System.out.println(sentence.replaceAll("\\s+", "\n"));

        String substring = sentence.length() > 10 ? sentence.substring(sentence.length() / 2) : sentence;
        System.out.println();
        System.out.println("MIDDLE 10 CHARACTERS: " + substring);
    }
}

So pretty much, I have this piece of code. It's intended to take a sentence, and print each word on its own line. It's also supposed to find the middle ten characters of a sentence. 
 
My problem is that I'm unsure how to make it so that I actually get the middle ten characters of a sentence. Currently in the code, it's written so that it finds the last two digits. Also, I would like to make it so that instead of having only the words print out on each line, I'd like it to say "first word: this" "second word: is" and so forth. Still, each on a separate line. Any help or guidance would be very appreciated, thank you!
 
import java.util.Scanner;

public class Sentence {

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

        System.out.print("Enter a sentence with 5+ words: ");
        String sentence = in.nextLine();
        System.out.println();

        int space = sentence.indexOf(" ");
        sentence = sentence.substring(0, space) + "\n" + sentence.substring(space + 1);
        System.out.println(sentence.replaceAll("\\s+", "\n"));

        String substring = sentence.length() > 10 ? sentence.substring(sentence.length() / 2) : sentence;
        System.out.println();
        System.out.println("MIDDLE 10 CHARACTERS: " + substring);
    }
}

原文：https://stackoverflow.com/questions/39477224