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Articles by Luiggi Mendoza
Why does Collections.sort use Mergesort?
I don't know about the documentation, but the implementation of java.util.Collections#sort in Java 8 (HotSpot) goes like this: @SuppressWarnings({"unchecked", "rawtypes"}) public static <T> void sort(List<T> list, Comparator<? super T> c) { list.sort(c); } And List#sort has this implementation: @SuppressWarnings({"unchecked", "rawtypes"}) default void sort(Comparator<?
Is StringBuilder threadsafe (using it with parallelStream)?
The better solution is to use events.parallelStream().map(event -> event+"\n").collect(Collectors.joining()); Or alternatively (thanks to @Holger): events.parallelStream().map(Object::toString).collect(Collectors.joining("\n", "", "\n")); In general avoid using forEach as terminal operation for streams. Usually reduction operations like collect or reduce are better alternatives.
Static Methods in Java
Say you have obviously, a object will not be created for calling . However, the class needs to be loaded in memory; and to the application, there is an object corresponding to the class, which can be referred to as , or . A loaded class is not initialized yet. When you call a static method for the 1st time, the class is initialized; some "space" is allocated for static variables, and static initializer code (like ) is executed.
Understanding overiding the equals method
I'm fairly new to java and am just trying to get my head around understanding of the and methods. I know for the equals method to be correct it needs to be: I am struggling to pinpoint which of the above properties I am and am not satisfying when writing my overide of the equals method. I am aware that eclipse can generate these for me, however as I haven't yet gotten the concept fully, writing it out helps me to learn.
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