java.lang.management.ThreadInfo Class in Java
Last Updated :
20 Jul, 2022
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java.lang.management.ThreadInfo class contains methods to get information about a thread. This information includes:
- Thread ID
- Thread Name
- State of the Thread
- Stack trace of the Thread
- The object upon which the Thread is blocked
- List of object monitors that are blocked by the Thread
- List of ownable synchronizers blocked by the Thread
- Number of times the Thread had been blocked
- The elapsed time for which the Thread had been blocked
Syntax: Class declaration
public class ThreadInfo extends Object
The methods of this class are as follows:
| Methods | Description |
|---|---|
| ThreadInfo from(CompositeData data) | This method is used to represent this composite data as a ThreadInfo object. |
| getBlockedCount() | This method is used to know how many times the thread associated with this ThreadInfo object had been blocked to enter a monitor or reenter a monitor. |
| getBlockedTime() | This method is used to know for many milliseconds the thread associated with this ThreadInfo object had been blocked to enter or reenter a monitor. |
| getLockedMonitors() | This method is used to get a list of 'MonitorInfo' objects, which are currently locked by the thread associated with this ThreadInfo object. |
| getLockedSynchronizers() | This method is used to get a list of 'ownable' synchronizers, which are currently locked by the thread associated with this ThreadInfo object. |
| getLockInfo() | This method is used to get information about the object for which the thread associated with this ThreadInfo object is blocked waiting. It returns a 'LockInfo' object representing the information. |
| getLockName() | This method is used to get the name of the object for which the thread associated with this ThreadInfo object is blocked waiting. |
| getLockOwnerId() | This method is used to get the ID of the thread which owns the object that is blocking this thread. |
| getLockOwnerName() | This method is used to get the Name of the thread which owns the object that is blocking this thread. |
| getStackTrace() | This method is used to get the stack trace of a Thread. |
| getThreadId() | This method is used to get the ID of a Thread. |
| getThreadName() | This method is used to get the name of a Thread. |
| getThreadState() | This method is used to get the state of a Thread. |
| getWaitedCount() | This method is used to know how many times the thread associated with this ThreadInfo object has waited for notification. |
| getWaitedTime() | This method is used to know for many milliseconds the thread associated with this ThreadInfo object has waited for notification. |
| isInNative() | This method is used to determine whether this ThreadInfo object is executing the native code via the java native interface or not. |
| isSuspended() | This method is used to determine whether the Thread associated with this ThreadInfo object is suspended or not. |
| toString() | This method is used to get string representation of the given ThreadInfo object. |
Implementation:
Example 1: Creating a new ThreadInfo object
// Java Program to demonstrate ThreadInfo Class
// Importing required libraries
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
// Main class
public class GFG {
// main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new thread by
// creating an object of Thread class
Thread thread = new Thread();
// running the thread using run() method
thread.run();
// Getting thread id using getId() method
long id = thread.getId();
// Creating a new ThreadInfo object
// using that id
ThreadInfo info
= ManagementFactory.getThreadMXBean()
.getThreadInfo(id);
// Print and display message on the console
System.out.println(
"ThreadInfo object created successfully");
}
// Catch block to handle the exceptions
catch (Exception e) {
// print the line number where exception occurs
e.printStackTrace();
}
}
}
Output:
ThreadInfo object created successfully
Example 2: Common-cleaner thread using ThreadInfo class
// Java Program to demonstrate ThreadInfo Class
// Importing required libraries
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// try block to check for exceptions
try {
long id = 10;
// Creating a new ThreadInfo object
// using this id
ThreadInfo info
= ManagementFactory.getThreadMXBean()
.getThreadInfo(id);
// Printing information about the thread
// 1. Printing thread id
System.out.println("Thread ID: "
+ info.getThreadId());
// 2. Printing Thread Name
System.out.println("Thread Name: "
+ info.getThreadName());
// 3. Printing thread State
System.out.println("Thread State: "
+ info.getThreadState());
// 4. Printing thread waited count
System.out.println("Waited count: "
+ info.getWaitedCount());
// 5. Printing thread waited time
System.out.println("Waited time: "
+ info.getWaitedTime());
// 6. Printing how many times this thread had
// been blocked
System.out.println("Times blocked: "
+ info.getBlockedCount());
// 7. Printing Blocked duration
System.out.println("Blocked duration: "
+ info.getBlockedTime());
// 8. Printing Locked Monitors
System.out.println("Locked Monitors: "
+ info.getLockedMonitors());
// 9. Printing Locked Owner's ID
System.out.println("Locked Owner's ID: "
+ info.getLockOwnerId());
// 10. Printing Locked Owner's Name
System.out.println("Locked Owner's Name: "
+ info.getLockOwnerName());
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where exception occurred
e.printStackTrace();
}
}
}
Output:
Thread ID: 10 Thread Name: Common-Cleaner Thread State: TIMED_WAITING Waited count: 1 Waited time: -1 Times blocked: 0 Blocked duration: -1 Locked Monitors: [Ljava.lang.management.MonitorInfo;@15aeb7ab Locked Owner's ID: -1 Locked Owner's Name: null
