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

public class BufferedWriterDemo {
    public static void main(String[] args) {
        try {
            BufferedWriter out = new BufferedWriter(new FileWriter("bwriter"));
            out.write("You are my sunshine!");
            out.close();
            System.out.println("文件创建成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

执行代码，生成文件

运行结果