Web Reference: Jan 21, 2026 · Depending on whether a method returns a value or not, Java methods are mainly divided into void methods and non-void methods. Knowing the difference between these two helps beginners understand when a method is used just to act and when it is used to return a result. java.lang.Void is analogous to java.lang.Integer. Integer is a way of boxing values of the primitive type int. Void is a way of boxing values of the primitive type void. "But wait, void doesn't have any possible values!" Right! That's what makes java.lang.Void "uninstantiable". :) Jun 22, 2025 · Use void when declaring a method that returns nothing. Use Void when you need to fit into a generic type (such as Callable or CompletableFuture). If you see Void, think of it as...
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