在调试多线程应用程序时，有时我们需要暂停单独的线程而不是整个应用程序，此时在断点上可以设置 Suspend 为 Thread，而不是默认的 All。关于这两个选项的区别，在 Breakpoints | IntelliJ IDEA 中的说明如下：
The following policies are available for the breakpoints that suspend program execution:
- All: all threads are suspended when any of the threads hits the breakpoint.
- Thread: only the thread which hits the breakpoint is suspended.