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Title: Optional.orElseThrow() without supplier | java.evolved

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Description: Use Optional.orElseThrow() as a clearer, intent-revealing alternative to get().

Open Graph Description: Use Optional.orElseThrow() as a clearer, intent-revealing alternative to get().

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Opengraph URL: https://javaevolved.github.io/errors/optional-orelsethrow.html

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Optional.orElseThrow() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Optional.html#orElseThrow()
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/errors/OptionalOrelsethrow.java
Errors Beginner Optional chaining Java 8 String city = null; if (user != null) { Address addr = user.getAddress(); if (addr != null) { city = addr.getCity(); } } if (city == null) city = "Unknown"; Java 9+ String city = Optional.ofNullable(user) .map(User::address) .map(Address::city) .orElse("Unknown"); Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/errors/optional-chaining.html
Streams Intermediate Optional.or() fallback Java 8 Optional cfg = primary(); if (!cfg.isPresent()) { cfg = secondary(); } if (!cfg.isPresent()) { cfg = defaults(); } Java 9+ Optional cfg = primary() .or(this::secondary) .or(this::defaults); Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/streams/optional-or.html
Errors Beginner Objects.requireNonNullElse() Java 8 String name = input != null ? input : "default"; // easy to get the order wrong Java 9+ String name = Objects .requireNonNullElse( input, "default" ); Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/errors/require-nonnull-else.html
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