https://kevinwang930.github.io/tags/random/Recent content in Random on Kevin wang's blogHugoen-USThu, 23 Jul 2026 21:45:00 +0200https://kevinwang930.github.io/post/computer/java-random/Thu, 23 Jul 2026 21:45:00 +0200https://kevinwang930.github.io/post/computer/java-random/<p>The JDK does not define a single random-number subsystem. It exposes distinct APIs in <code>java.util</code>, <code>java.util.concurrent</code>, <code>java.security</code>, and, since Java 17, <code>java.util.random</code>. This post gives an <strong>overview</strong> of those API lineages, then the <strong>generator mechanisms</strong> behind each type, and finally a <strong>lineage selection</strong> procedure with invocation patterns. Pseudorandom generation is not encryption; cryptographic protocols obtain secret material from the JCA <code>SecureRandom</code> path.</p>