Here is a collection of short summaries of Joshua Blochs great book Effective Java for easy future reference. Remember that you'll have to stick to what you documented. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Use reflection, if possible, only to instantiate objects and access the objects using an interface or a superclass that is known at compile time.Historically, native methods have had three main uses.New Java versions make use of NDK rarely advisable for improve performance.Strive to write good programs rather than fast ones, speed will follow.Use checked exceptions only if these 2 conditions happen:Refactor the checked exception into a unchecked exception to make the API more pleasant.Invocation with state-testing method and unchecked exceptionHigher layers should catch lower-level exceptions and, in their place, throw exceptions that can be explained in terms of the higher-level abstraction.Do not overused. We could change the implementation of the If there is not an appropriate interface we can refer to the object by a class. Use helper class if necessary.Prefer enum types to boolean parameters when it makes the parameter more explicit.As shown in the previous example overloading can be confusing. Effective Java - Creating and Destroying Objects. They only have one state for its lifetime.Immutable objects are thread-safe. 2. If working with serialization, try not deserialize untrusted data. Use BigDecimal, int or long for this kind of calculation.Use primitives whenever you can. super E)If we have a stack implementation and we want to add two methods pushAll and popAll, we should implement it this way ://We want to push in everything that is E or inherits E//We want to pop out in any Collection that can welcome EEven thow it's not legal to declare generic arrays explicitly, it's still possible to use varargs with generics. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. In order to use streams properly, you need to know about collectors. The If a class has mutable components that comes from or goes to the client, the class needs to make defensive copies of those components.//This example is a good example but since java 8, we would use Instant instead of Date which is immutable * @param end the end of the period; must not precede start; * @throws IllegalArgumentException if start is after end * @throws NullPointerException if start or end is nullChoose your methode name carefully. Item 58: Check v/s unchecked exception Three kinds of throwables Throwables Checked Recoverable checked exceptions Y Y runtime exceptions N N errors N N Principle Use checked exceptions for conditions from which the caller can reasonably be expected to recover.
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