optional

2 tutorials tagged “optional”.

Optional Best PracticesWhen to use Optional and when not to: return types yes, fields and parameters no, never null, no bare get, and how to chain map, flatMap and orElse well.Java · medium · 4 min · Nov 13, 2026
Optional Class in JavaOptional is a container that may or may not hold a value, used to return 'no result' without null. Learn how to create, check, read and transform it.Java · easy · 5 min · Nov 13, 2026

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2d-arrays abstraction aggregation algorithms annotations arrays atomics basics benchmarking best-practices bigdecimal binary break bytecode careers casting char classes classfile classloading clean-code collections collectors command-line comments completablefuture concurrency configuration console constants constructors continue control-flow conventions copying cpp data-types date-time deadlock debugging default-values deque design design-patterns do-while encapsulation encoding enum enums errors exceptions executors expressions files final first-program for-each for-loop forkjoin format formatting functional-interfaces gc generics has-a hashmap history http ide identifiers if-else immutability inheritance initialization inner-classes input instanceof interfaces internals interview io java java-11 java-14 java-15 java-16 java-17 java-25 java-7 java11 java16 java21 java22 java24 java25 java8 javac javadoc javascript jdk jit jmm jshell jvm keywords lambda legacy list literals locks loops main-method map math memory method-references methodhandles methods modern-java modules multithreading naming nested-loops networking nio null null-safety numbers object-class objects oop operators output overflow overloading packages pass-by-value pattern-matching performance polymorphism practice precedence preview printf process programs proxy python queue random records recursion reference references reflection regex return scanner scope sealed security serialization set setup sockets solid sorting stack static streams strings super switch synchronization system ternary this threads time-zones tools troubleshooting type-casting udp unicode url utility utility-classes uuid validation var varargs variables versions virtual-threads while-loop wrapper-classes zip