Overview
The Better Checks library provides a lightweight and concise, but powerful way for precodition checking in Java, in particular for method arguments. Checks are written in a fluent way.
Examples:
Check.that(name).matches("hello .*!").hasLengthBetween(0, 20);
Check.that(list).isNullOr().hasSize(0);
Check.that(args).named("arguments").isNotEmpty();
The actual checking methods, such as matches(...) or hasSize(...), all throw an exception if the check fails. The exact type of exception depends on the kind of check that is called but in most cases it is IllegalArgumentException.
Download
The recommended way of getting the Better Checks library is declaring a dependency on the “better-checks-core” library using your build system. For Maven, use:
<dependency>
<groupId>ch.trick17.better-checks</groupId>
<artifactId>better-checks-core</artifactId>
<version>1.0</version>
</dependency>
Otherwise, you can download the source code or binaries from Github: