utility-classes

3 tutorials tagged “utility-classes”.

Arrays ClassThe java.util.Arrays toolbox: toString, sort, binarySearch, fill, equals, copyOf and asList, with the traps in binarySearch and asList explained.Java · easy · 4 min · Nov 11, 2026
Math ClassThe Math class toolbox: abs, max, pow, sqrt, round, floor, ceil, PI, floorDiv, floorMod and the exact methods, with the surprises in each.Java · easy · 4 min · Nov 11, 2026
Generating Random NumbersRandom numbers in Java: Math.random, Random with seeds, ThreadLocalRandom for ranges, SecureRandom for OTPs, and getting a range right.Java · easy · 4 min · Nov 11, 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 optional 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 uuid validation var varargs variables versions virtual-threads while-loop wrapper-classes zip