Effective Java 27 Favor generic methods

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Effective Java 27 Favor generic methods

Static utility methods are particularly good candidates for generification. The type parameter list, which declares the type parameter, goes between the method's modifiers and its return type. // Generic method public static <E> Set<E> union(S…

Effective Java 26 Favor generic types

Use generic types to replace the object declaration Add one or more type parameters to its declaration. Replace all the uses of the type Object with the appropriate type parameter. Handle the new E[] errorwith two ways : Use the explicit type casting…

Effective Java 16 Favor composition over inheritance

Inheritance disadvantage Unlike method invocation, inheritance violates encapsulation. Since you don't know the super class implementation which may involve some unpredictable calling between different methods of super class. And it is difficult to m…

Effective Java 54 Use native methods judiciously

Java Native Interface(JNI) allows Java applications to call native methods, which are special methods written in native programming languages such as C or C++. Historical usages of native methods Access to platform-specific facilities such as registr…

Effective Java 76 Write readObject methods defensively

Principle readObject method is effectively another public constructor, and it demands all of the same care as any other constructor. Just as a constructor must check its arguments for validity (Item 38) and make defensive copies of parameters where a…

Effective Java 60 Favor the use of standard exceptions

Benefits to reuse preexisting exceptions It makes your API easier to learn and use. Programs using your API are easier to read. Fewer exception classes mean a smaller memory footprint and less time spent loading classes. Common Exceptions Exception O…