package fileoperations;
import java.io.File;
import java.io.IOException;

public class SimpleFile {
    public static void main(String[] args) throws IOException {
        File file =new File("text.txt");
        file.createNewFile();
        System.out.println("File is created");
        FileWriter writer = new FileWriter(file);

        // Writes the content to the file
        writer.write("Enter the text that you want to write"); 
        writer.flush();
        writer.close();
        System.out.println("Data is entered into file");
    }
}

Java 7+值得一试：

 Files.write(Paths.get("./output.txt"), "Information string herer".getBytes());

看起来很有希望。。。

使用JFilechooser与客户一起阅读集合并保存到文件。

private void writeFile(){

    JFileChooser fileChooser = new JFileChooser(this.PATH);
    int retValue = fileChooser.showDialog(this, "Save File");

    if (retValue == JFileChooser.APPROVE_OPTION){

        try (Writer fileWrite = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileChooser.getSelectedFile())))){

            this.customers.forEach((c) ->{
                try{
                    fileWrite.append(c.toString()).append("\n");
                }
                catch (IOException ex){
                    ex.printStackTrace();
                }
            });
        }
        catch (IOException e){
            e.printStackTrace();
        }
    }
}

public class Program {
    public static void main(String[] args) {
        String text = "Hello world";
        BufferedWriter output = null;
        try {
            File file = new File("example.txt");
            output = new BufferedWriter(new FileWriter(file));
            output.write(text);
        } catch ( IOException e ) {
            e.printStackTrace();
        } finally {
          if ( output != null ) {
            try {
                output.close();
            }catch (IOException e){
                e.printStackTrace();
            }
          }
        }
    }
}

这里我们将字符串输入到文本文件中：

String content = "This is the content to write into a file";
File file = new File("filename.txt");
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(content);
bw.close(); // Be sure to close BufferedWriter

我们可以轻松地创建一个新文件并向其中添加内容。

在Java 11+中，编写纯文本：

Files.writeString(Path.of("filename.txt"), "some-text");