| Package | Description | 
|---|---|
| com.sun.jdi | This is the core package of the Java Debug
 Interface (JDI), it defines mirrors for values, types, and the target
 VirtualMachine itself - as well bootstrapping facilities. | 
| Modifier and Type | Method and Description | 
|---|---|
| ThreadGroupReference | ThreadGroupReference. parent()Returns the parent of this thread group. | 
| ThreadGroupReference | ThreadReference. threadGroup()Returns this thread's thread group. | 
| Modifier and Type | Method and Description | 
|---|---|
| List<ThreadGroupReference> | ThreadGroupReference. threadGroups()Returns a List containing each active  ThreadGroupReferencein this
 thread group. | 
| List<ThreadGroupReference> | VirtualMachine. topLevelThreadGroups()Returns each thread group which does not have a parent. | 
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