Java by API/java.lang.management/ManagementFactory

ManagementFactory: getMemoryPoolMXBeans()

   <source lang="java">

import java.io.PrintWriter; import java.lang.instrument.Instrumentation; import java.lang.management.ManagementFactory; import java.lang.management.MemoryPoolMXBean; import java.lang.management.MemoryUsage; import java.lang.management.ThreadMXBean; import java.util.List; public class MainClass {

 public static void main(String[] a){
   //premain();
   
 }
 
 public static void premain(final Instrumentation inst) {
   Runtime.getRuntime().addShutdownHook(new Thread() {
     public void run() {
       try {
         PrintWriter out = new PrintWriter(System.err);
         ThreadMXBean tb = ManagementFactory.getThreadMXBean();
         out.printf("Current thread count: %d%n", tb.getThreadCount());
         out.printf("Peak thread count: %d%n", tb.getPeakThreadCount());
         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
         for (MemoryPoolMXBean pool : pools) {
           MemoryUsage peak = pool.getPeakUsage();
           out.printf("Peak %s memory used: %,d%n", pool.getName(), peak.getUsed());
           out.printf("Peak %s memory reserved: %,d%n", pool.getName(), peak.getCommitted());
         }
         Class[] loaded = inst.getAllLoadedClasses();
         out.println("Loaded classes:");
         for (Class c : loaded)
           out.println(c.getName());
         out.close();
       } catch (Throwable t) {
         System.err.println("Exception in agent: " + t);
       }
     }
   });
 }

}

 </source>
   
  
 
  

ManagementFactory: getRuntimeMXBean()

   <source lang="java">
 

import java.lang.management.ManagementFactory; import java.lang.management.RuntimeMXBean; import java.util.Date; public class Main {

 public static void main(String args[]) throws Exception {
   RuntimeMXBean mx = ManagementFactory.getRuntimeMXBean();
   System.out.println(mx.getBootClassPath());
   System.out.println(mx.getClassPath());
   System.out.println(mx.getInputArguments());
   System.out.println(mx.getSystemProperties());
   System.out.println(new Date(mx.getStartTime()));
   System.out.println(mx.getUptime() + " ms");
 }

}

 </source>
   
  
 
  

ManagementFactory: getThreadMXBean()

   <source lang="java">

import java.io.PrintWriter; import java.lang.instrument.Instrumentation; import java.lang.management.ManagementFactory; import java.lang.management.MemoryPoolMXBean; import java.lang.management.MemoryUsage; import java.lang.management.ThreadMXBean; import java.util.List; public class MainClass {

 public static void main(String[] a){
   //premain();
   
 }
 
 public static void premain(final Instrumentation inst) {
   Runtime.getRuntime().addShutdownHook(new Thread() {
     public void run() {
       try {
         PrintWriter out = new PrintWriter(System.err);
         ThreadMXBean tb = ManagementFactory.getThreadMXBean();
         out.printf("Current thread count: %d%n", tb.getThreadCount());
         out.printf("Peak thread count: %d%n", tb.getPeakThreadCount());
         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
         for (MemoryPoolMXBean pool : pools) {
           MemoryUsage peak = pool.getPeakUsage();
           out.printf("Peak %s memory used: %,d%n", pool.getName(), peak.getUsed());
           out.printf("Peak %s memory reserved: %,d%n", pool.getName(), peak.getCommitted());
         }
         Class[] loaded = inst.getAllLoadedClasses();
         out.println("Loaded classes:");
         for (Class c : loaded)
           out.println(c.getName());
         out.close();
       } catch (Throwable t) {
         System.err.println("Exception in agent: " + t);
       }
     }
   });
 }

}

 </source>