Question

我需要在数组中打印字符串的特定索引，例如

String[] words = {car, bike, truck};

打印words[0][0]，结果为c并打印words[0][1] = a。

此外，我必须从文本文件中读取数组。到目前为止我将打印数组的第一个单词。

import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.io.FileNotFoundException;

public class DemoReadingFiles
{
    public static void main (String[] args)
    {
        String[] words = readArray("words.txt");

            System.out.println(words[0]);//i can get it to print specific elements

    }

    public static String[] readArray(String file)
    {
        int ctr = 0;
        try
        {
            Scanner s1 = new Scanner(new File(file));
            while (s1.hasNextLine())
            {
                ctr = ctr + 1;
                s1.next();
            }
            String[] words = new String[ctr];

            Scanner s2 = new Scanner(new File(file));
            for (int i = 0; i < ctr; i = i + 1)
            {
                words[i] = s2.next();
            }
            return words;

        }
        catch (FileNotFoundException e)
        {

        }
        return null;
    }
}

Answer 1

public static void main(String[] args) {
  String[] words = {"cars", "bike", "truck"};
  System.out.println("Specific character print:" + words[0].charAt(0));
  System.out.println("Multi character selection printed as follows:" + words[0].substring(1, words[0].length() - 1));

}

输出：

 Specific character print:c

 Multi character selection printed as follows:ar

在字符串数组中打印特定字符

1 个答案: