在Java中，可以使用以下几种方法来安全地创建线程对象：

1. 使用Runnable接口：

public class MyRunnable implements Runnable {
    @Override
    public void run() {
        // 线程执行的代码逻辑
    }
}

public class Main {
    public static void main(String[] args) {
        Thread thread = new Thread(new MyRunnable());
        thread.start();
    }
}

2. 使用Callable和Future接口：

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class MyCallable implements Callable {
    @Override
    public String call() throws Exception {
        // 线程执行的代码逻辑
        return "线程执行结果";
    }
}

public class Main {
    public static void main(String[] args) {
        Callable callable = new MyCallable();
        FutureTask futureTask = new FutureTask<>(callable);
        Thread thread = new Thread(futureTask);
        thread.start();

        try {
            String result = futureTask.get();
            System.out.println(result);
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }
}

3. 使用线程池：

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MyRunnable implements Runnable {
    @Override
    public void run() {
        // 线程执行的代码逻辑
    }
}

public class Main {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newFixedThreadPool(5);
        executorService.execute(new MyRunnable());
        executorService.shutdown();
    }
}

这些方法都是安全的线程对象创建方式，可以根据具体需求选择合适的方法。