Filehand

Before performing any file operations, the file must be

import java.io.*;

public class ReadData {

public static void main(String[] args) {

String name = "abc.txt"; // 文件名

String line;

try (BufferedReader reader = new BufferedReader(new FileReader(name))) {

int i = 0;

// 在此处填入合适的代码，使循环能读取文件前 10 行

while (

import java.io.*;

public class ReadAndCount {

public static void main(String[] args) {

String fileName = "test.txt";

String line;

int lineCount = 0;

int nonEmptyLineCount = 0;

try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {

while(lineCount < 5) && ((line = reader.readLine()) != null) {

line = reader.readLine();

if (line != null && !line.trim().isEmpty()) {

————————++

}

——————++;

}

System.out.println("非空行数量: " + nonEmptyLineCount);

} catch (IOException e) {

e.printStackTrace();

}

}

}

The command to open a file for reading is written as:

To add data to an existing file without overwriting its contents, the file should be opened in

• The command used to read the next line of text from a file is

  <file identifier>, <variable>.

  Answer:

The function

To close a file after it is no longer needed, use the

Data is written into the file (after the file has been opened in WRITE or APPEND mode) using the

Create a text file.

DECLARE myTextFile : STRING

← "myText.txt"