Java performance timing library

JUnit 4 got a built-in timing-contraint functionality.

@Test(timeout=X)

should do the trick. X is the maximum number of milliseconds the method is allowed to run.

Ignore this answer as the project is no longer active

I haven't used it but I came across perf4j recently.

Not a direct answer to your question, but I am also often using this tip to time my code and just wrote the following simple Eclipse -> Surround With template:

long startTime = System.currentTimeMillis();
${line_selection}${cursor}
long totalTime = System.currentTimeMillis() - startTime;
System.out.println("Total time = " + totalTime);
System.out.println();