Java文件的读写和处理（一）

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

public class FileReadWriteExample {

  public static void main(String[] args) throws IOException {
    // 创建文件对象
    File file = new File("example.txt");

    // 写入文件内容
    BufferedWriter writer = new BufferedWriter(new FileWriter(file));
    writer.write("Hello World!");
    writer.close();

    // 读取文件内容
    BufferedReader reader = new BufferedReader(new FileReader(file));
    String line = reader.readLine();
    reader.close();

    System.out.println(line);
  }
}