A Beginner‘s Guide to Java 8 Programming81

Java 8 is a major release of the Java platform that introduces significant language and library enhancements. This tutorial will provide a gentle introduction to the core features of Java 8, including lambda expressions, method references, and the new Date and Time API.

Lambda Expressions

Lambda expressions are a concise way to represent anonymous functions. They are defined using the following syntax:```
(parameters) -> expression
```

For example, the following lambda expression returns the sum of two numbers:```
(a, b) -> a + b
```

Lambda expressions can be used as arguments to methods, and they can also be stored in variables.

Method References

Method references provide a concise way to refer to methods. They are defined using the following syntax:```
ClassName::methodName
```

For example, the following method reference refers to the `toString()` method of the `Object` class:```
Object::toString
```

Method references can be used as arguments to methods, and they can also be stored in variables.

The New Date and Time API

Java 8 introduces a new Date and Time API that provides a more modern and flexible way to work with dates and times. The new API is based on the Joda-Time library, which is a popular third-party library for working with dates and times.

The new Date and Time API includes the following classes:* `LocalDate`: Represents a date without a time zone.
* `LocalTime`: Represents a time without a time zone.
* `LocalDateTime`: Represents a date and time without a time zone.
* `ZonedDateTime`: Represents a date and time with a time zone.

The new Date and Time API also includes a number of utility classes and methods that make it easy to work with dates and times.

Conclusion

Java 8 is a major release of the Java platform that introduces a number of significant new features. This tutorial has provided a gentle introduction to the core features of Java 8, including lambda expressions, method references, and the new Date and Time API.

Additional Resources* [Java 8 Tutorial](/javase/8/docs/technotes/guides/language/)
* [Lambda Expressions](/javase/tutorial/java/javaOO/)
* [Method References](/javase/tutorial/java/javaOO/)
* [The New Date and Time API](/javase/8/docs/technotes/guides/datetime/)

2024-12-08

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