读取src/step2/input/目录下的task.txt文件信息并输出到控制台，使用java代码将字符串learning practice写入到src/step2/output/目录下的output.txt，若文件目录不存在，则创建该目录。

可以使用以下代码实现：

1. 读取task.txt文件信息并输出到控制台：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileDemo {
    public static void main(String[] args) {
        String filePath = "src/step2/input/task.txt";
        File file = new File(filePath);
        BufferedReader reader = null;

        try {
            reader = new BufferedReader(new FileReader(file));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

2. 将字符串learning practice写入到output.txt文件中：

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class WriteFileDemo {
    public static void main(String[] args) {
        String dirPath = "src/step2/output";
        String filePath = dirPath + "/output.txt";
        String content = "learning practice";
        File dir = new File(dirPath);
        File file = new File(filePath);
        BufferedWriter writer = null;

        try {
            if (!dir.exists()) {
                dir.mkdirs();
            }
            if (!file.exists()) {
                file.createNewFile();
            }
            writer = new BufferedWriter(new FileWriter(file));
            writer.write(content);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}