View difference between Paste ID: ECQpz8g4 and ZbxV1WHM

 import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.IntStream;
 import com.sun.management.ThreadMXBean;
 
 
 public class Main {
-	private final static ThreadMXBean threadMgmt = getSunThreadMxBean();	// @Nullable to enforce checking (99.99999% to be non-null)
+	private final static ThreadMXBean threadMgmt = getSunThreadMxBean();
 
 	public static long getMemoryAllocated(Thread thread) {
 		if (threadMgmt == null) {
 			return -1;
 		} else {
 			return threadMgmt.getThreadAllocatedBytes(thread.getId());
 		}
 	}
 
 	private static ThreadMXBean getSunThreadMxBean() {
 		try {
 			// original bean is from j.l.m package (interface), but actually it's Sun's extension
 			return (ThreadMXBean) ManagementFactory.getThreadMXBean();
 		} catch (ClassCastException fail) {
 			return null;
 		}
 	}
 
 	public static void main(String[] args) throws IOException, InterruptedException {
 		Thread.sleep(10_000);
 		System.out.println(getMemoryAllocated(Thread.currentThread()));
 		int[] ints = IntStream.range(0, Integer.MAX_VALUE >> 1).toArray();
 		System.out.println(ints.length);
 		System.out.println(getMemoryAllocated(Thread.currentThread()));
 		ints = null;
 		System.gc();
 		System.out.println(getMemoryAllocated(Thread.currentThread()));
 		Thread.sleep(10_000);
 		String s = "";
 		for (int i = 0; i < 10_000; i++) {
 			s += i;
 		}
 		System.out.println(getMemoryAllocated(Thread.currentThread()));
 		System.out.println(s);
 		System.out.println(getMemoryAllocated(Thread.currentThread()));
 	}
 }