Web Reference: You avoid null checks by not returning null in the first place — use Optional or default (null-object) values instead. If something must never be null, validate it once at the start using Objects.requireNonNull (). Generally, null variables, references and collections are tricky to handle in Java code. They are not only hard to identify but also complex to deal with. As a matter of fact, any miss in dealing with null cannot be identified at compile time and results in a NullPointerException at runtime. In this tutorial, we’ll take a look at the need to check ... Aug 6, 2025 · In Java, a special null value can be assigned to an object reference. NullPointerException is thrown when program attempts to use an object reference that has the null value.
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