Java Common Utils

Guava
https://github.com/google/guava/wiki/CommonObjectUtilitiesExplained

Note: The newly introduced Objects class in JDK 7 provides the equivalent Objects.equalsmethod.

  public static int hashCode(@Nullable Object... objects) {

    return Arrays.hashCode(objects);

  }

ComparisonChain performs a "lazy" comparison: it only performs comparisons until it finds a nonzero result, after which it ignores further input.

   public int compareTo(Foo that) {
     return ComparisonChain.start()
         .compare(this.aString, that.aString)
         .compare(this.anInt, that.anInt)
         .compare(this.anEnum, that.anEnum, Ordering.natural().nullsLast())
         .result();
   }

MoreObjects

firstNonNull(@Nullable T first, @Nullable T second)

https://github.com/google/guava/wiki/PrimitivesExplained


https://kodejava.org/calculate-timings-using-commons-lang-stopwatch/

import org.apache.commons.lang.time.StopWatch;
        StopWatch stopWatch = new StopWatch();
        // Start the watch, do some task and stop the watch
        stopWatch.start();
        doSomeTask(5000);
        stopWatch.stop();
        // Print out the total time of the watch
        System.out.println("Time: " + stopWatch.getTime());