OutputStream不适用于线程

Question

您能帮我解决下一个问题吗？ 我试图将PrintStream与我的线程一起使用，以使它们将内容写入不同的输出。 问题是：System.out可以正常运行，但是当我尝试添加时

File f1 = new File("src/task7/simple/1.txt"); 
PrintStream filePRinPrintStream = new PrintStream(f1)

我的线程不想写任何东西，在普通打印为main（）方法正常时，它不会引发任何警告或异常。

filePRinPrintStream.println("PREVED");

这是我的代码摘录，供您参考。

public class NamePrinterThread implements Runnable, NamePrinterIF{

    private String name;
    private PrintStream outputStream;
    private long interval;
    private int count;

    @Override
    public void setPrintName(String name) {
        this.name = name;
    }

    @Override
    public void setStream(PrintStream stream) {
        if(stream == null) throw new NullPointerException("PrintStream is null");
        this.outputStream = stream;
    }

    @Override
    public void setInterval(long ms) {
        if(ms <= 0) throw new IllegalArgumentException("Printing interval can't be negative");
        this.interval = ms;
    }

    @Override
    public void setCount(int count) {
        if(count <= 0) throw new IllegalArgumentException("Printing count can't be negative");
        this.count = count;
    }

    @Override
    public void run() {
        for (int i = 0; i < this.count; i++) {
            try {
                outputStream.println(this.name);
                Thread.sleep(interval);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }       
    }

    public void startThread(){
        new Thread(this, name).start();
    }

}

和另一类的主要方法

public static void main(String[] args) {

        File f1 = new File("src/task7/simple/1.txt");

        try(PrintStream filePRinPrintStream = new PrintStream(f1)){ 

            //filePRinPrintStream.println("PREVED");
            NamePrinterIF thread2 = new NamePrinterThread();
            thread2.setCount(20);
            thread2.setInterval(350);
            thread2.setStream(filePRinPrintStream);
            thread2.setPrintName("thread2");

            thread2.startThread();

            filePRinPrintStream.flush();
        } catch(IOException e){
            e.printStackTrace();
        }

        NamePrinterIF thread1 = new NamePrinterThread();
        thread1.setCount(10);
        thread1.setInterval(200);
        thread1.setStream(System.out);
        thread1.setPrintName("thread1");

        thread1.startThread();
    }

Answer 1

完成后，关闭main中的打印流。 如果主线程在所有线程终止后终止，然后干净地关闭流，那将是一个好主意。