java - 与 Thread.sleep 相比，new Thread().sleep 在 CPU 和内存利用率方面有多差？

Question

我知道应该在静态上下文中访问 sleep 。然而，我需要更多的意见，以便我可以向管理层辩护。我现在处理的大多数遗留代码都使用 new Thread().sleep 而不是 Thread.sleep。

这有多糟糕？

for (int c = 0; c < 5; c++) {
    new Thread().sleep(5000);
}

与此相比？

for (int c = 0; c < 5; c++) {
    Thread.sleep(5000);
}

编辑:

    final long start = System.currentTimeMillis();
    System.out.println("Total memory: " + Runtime.getRuntime().totalMemory());
    System.out.println("Free memory: " + Runtime.getRuntime().freeMemory());
    System.out.println("===========================");
    for (int c = 0; c < 5; c++) {
        new Thread().sleep(5000);
        System.out.println("Used memory: " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()));
        System.out.println("===========================");
    }
    System.out.println("Total memory: " + Runtime.getRuntime().totalMemory());
    System.out.println("Free memory: " + Runtime.getRuntime().freeMemory());
    System.out.println("===========================");
    System.out.println("Time elapsed: " + (System.currentTimeMillis() - start) + " milliseconds");

结果(new Thread().sleep):

Total memory: 5177344
Free memory: 4990904
===========================
Used memory: 186440
===========================
Used memory: 205136
===========================
Used memory: 205136
===========================
Used memory: 205136
===========================
Used memory: 205136
===========================
Total memory: 5177344
Free memory: 4972208
===========================
Time elapsed: 24938 milliseconds

结果(Thread.sleep):

Total memory: 5177344
Free memory: 4990904
===========================
Used memory: 186440
===========================
Used memory: 186440
===========================
Used memory: 204848
===========================
Used memory: 204848
===========================
Used memory: 204848
===========================
Total memory: 5177344
Free memory: 4972496
===========================
Time elapsed: 24938 milliseconds

Answer 1

这只是文盲编程，就这么简单。同样适用于以这种方式调用任何静态方法，它不限于 Thread.sleep()。它会带来毫无意义的空间和时间成本，但更糟糕的是，它暴露了程序员的主要概念误解。我不会花太多精力去修复所有的问题，但我肯定会做一些对相关人员进行再教育的事情。