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Java 9: Building Robust Modular Applications
book

Java 9: Building Robust Modular Applications

by Dr. Edward Lavieri, Peter Verhas, Jason Lee
April 2018
Intermediate to advanced content levelIntermediate to advanced
910 pages
33h 21m
English
Packt Publishing
Content preview from Java 9: Building Robust Modular Applications

Using the diamond operator

Introduced in Java 9, the diamond operator can be used with anonymous classes if the inferred data type is denotable. When a data type is inferred, it suggests that the Java Compiler can determine the data types in a method's invocation. This includes the declaration and any included arguments.

The diamond operator is the less-than and greater-than symbol pair (<> ). It is not new to Java 9; rather, the specific use with anonymous classes is.

The diamond operator was introduced in Java 7 and made instantiating generic classes simpler. Here is a pre-Java 7 example:

    ArrayList<Student> roster = new ArrayList<Student>();

Then, in Java 7, we could rewrite it:

    ArrayList<Student> roster = new ArrayList<>();

The problem ...

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Publisher Resources

ISBN: 9781788832823Supplemental ContentOtherPurchase LinkErrata Page