Stop returning null . Use Optional for methods that might not return a value, or use @NonNull annotations to let your IDE catch null pointer bugs early.
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Master streams, lambdas, and functional interfaces. Use them to write declarative, side-effect-free code.
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97 Things Every Java Programmer Should Know , edited by Trisha Gee and Kevlin Henney, is a collection of crowdsourced wisdom from 73 industry experts. It provides a diverse set of perspectives on the Java language, the JVM, and the broader craft of software development.
Use for test structuring and Mockito for isolating dependencies. Stop returning null
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