By Douglas Dunn

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Array components are fields in the dynamically created array classes. They are always initialized to standard default values. It does not matter if the array is created in a method or constructor and assigned to a local variable. In that case, the array variable is local, not the array components. 2 Initialization Blocks Initialization blocks are easy to recognize because they are freestanding blocks of code that have at most one modifier (the static keyword) and no name. 2 The Terminology of Class Body Declarations in Volume 1, the JLS (and most other Java books) refer to these blocks of code as instance initializers and static initializers.

In this example, the default value is clearly a statically compiled initial value. The following is an alternative implementation of the same constructor design. getTime(); } Though assigned in a constructor, this default value is also statically compiled because it is not passed as an argument. getTime() variable initializer is a waste of time. On the other hand, if there were more than one constructor that used the current date as a default, invoking new Date() in the variable initializer requires less code than assigning the same default value in each of the constructors.

Another example of how the use of factory methods has evolved since the publication of Design Patterns is their use to return instances of cached immutable objects. If there are many requests for the same immutable object, creating it over and over again in a constructor makes no sense. 4 release. There are many such examples in the core API. The reason for making these comparisons to Design Patterns is not to discredit the Gang-of-Four (the GoF, or authors), merely to point out that their ideas have evolved over time along with the Java programming language.

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