Tag: java

Java enum in switch case : 1. Returns the enum constant of the specified enum type with the specified name. 2. The case label...

Java get timestamp milliseconds : 1.System.currentTimeMillis(); 2.Calendar.getInstance().getTimeInMillis(); 3.new Date().getTime();...

Java enum check if value exists: 1. Enum class provides inspection methods 2. Check with for loop 3.Use stream iterators 4.Use a tool class similar...

Java generics, in a nutshell, generics enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods....

A java stream is a sequence of objects, which can be arranged, filtered, and transformed through a pipeline to produce the desired result....

A java exception is an event that occurs during the execution of a java program that disrupts the normal flow of instructions....

Java 8 functional interface: Function<T, R> : R apply(T t), Supplier<T> : T get() , Predicate<T> : boolean test(T t) , Consumer<T> : void accept(T...

IntelliJ IDEA is an excellent Java IDE, with the help of excellent IDEA plugins, we can greatly improve efficiency in daily development....

Java random number have three ways: java.lang.Math.Random, java.util.Random, java.util.concurrent.ThreadLocalRandom...

Lambda expressions are a simplification of anonymous inner classes, a functional programming idea that makes code look cleaner....

Install Java JDK and Maven on mac os: 1) Download and install files from the official website; 2) Install using homebrew package manager....

Java is case sensitive; The main method must be declared public, and each application has one and only one main method; General syntax used by...