java 中的 Java . lang . management . threadinfo 类
原文:https://www . geesforgeks . org/Java-lang-management-threadinfo-class-in-Java/
Java . lang . management . ThreadInfo 类包含获取线程信息的方法。这些信息包括:
- 线程标识
- 线程名称
- 线程的状态
- 线程的堆栈跟踪
- 线程被阻止的对象
- 线程阻止的对象监视器列表
- 被线程阻止的可拥有的同步器列表
- 线程被阻止的次数
- 线程被阻塞的时间
语法:类声明
public class ThreadInfo
extends Object
此类的方法如下:
| way | describe | | --- | --- | | ThreadInfo from(复合数据) | 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 is blocked from entering the monitor or re-entering the monitor. | | getBlockedTime() | This method is used to know how many milliseconds the thread associated with this ThreadInfo object has been blocked from entering or re-entering the monitor. | | getLockedMonitors() | This method is used to obtain the list of " *monitorinfo* " objects currently locked by the thread associated with this ThreadInfo object. | | getlockedsynchronizer() | This method is used to obtain the list of synchronizers that *can own currently locked by the thread associated with this ThreadInfo object.* | | 获取锁定信息（） | This method is used to get the information of the object whose thread associated with this ThreadInfo object is blocked from waiting. It returns a " *lock information* object representing information. | | getlock name（） | This method is used to get the name of the object whose thread associated with this ThreadInfo object is blocked from waiting. | | getLockOwnerId() | This method is used to get the Id of the thread that owns the object blocking this thread. | | getlockwownername() | This method is used to get the name of the thread that owns the object 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 status of a Thread. | | getWaitedCount() | This method is used to know how many times the thread associated with this ThreadInfo object waits for notification. | | getWaitedTime() | This method is used to know how many milliseconds the thread associated with this ThreadInfo object has been waiting for notification. | | 是天生的() | This method is used to determine whether this ThreadInfo object is executing native code through java native interface. | | issuespended() | This method is used to determine whether the thread associated with this ThreadInfo object is suspended. | | toString() | This method is used to get the string representation of the given ThreadInfo object. |实施:
示例 1: 创建新的线程信息对象
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to demonstrate ThreadInfo Class
// Importing required libraries
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
// Maij 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();
}
}
}
输出:
ThreadInfo object created successfully
示例 2: 使用 ThreadInfo 类的通用清理器线程
Java 语言(一种计算机语言，尤用于创建网站)
// 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 occured
e.printStackTrace();
}
}
}
输出:
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
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