Java 7 & Java 8 new features with Lambdas & Streams

Discover how the try with resources statement in Java seven enables automatic resource closing by the JVM, reducing memory leaks and simplifying code.

Discover how Java 7's suppressed exceptions preserve the original cause across try, catch, and finally, using addSuppressed and getSuppressed for better logging and debugging.

Java 7 enables catching multiple exceptions in one catch block, reducing redundancy by handling null pointer and array index out of bounds with a single implicit final variable.

Explain how Java seven's rethrowing of exceptions with more inclusive type checking improves readability by allowing first and second exceptions to be declared in throws, based on the catch block.

Explore how Java 7 introduces ReflectiveOperationException to simplify reflection error handling, allowing a single catch instead of exceptions like illegal access, invocation target, no such method, and class not found.

Explore the Java seven Objects class in java.util, a static-method utility for null checks and object operations, including equals, deep equals, hashCode, and toString.

Explore the new close method in URLClassLoader introduced in Java 7, and use try-with-resources to prevent resource leaks when loading classes and resources from jars or URLs.

Apply the @SafeVarargs annotation to suppress heap pollution warnings for varargs methods and constructors. It can be used on final, static, and private methods, but not on overridable public ones.

Learn how Java seven's i/o (nio) and path features simplify file and directory operations, using Path, Paths, and Files to read, write, copy, and delete with blocking versus non-blocking behavior.

Learn to work with paths in Java seven using the Path and Paths classes, including building, resolving, normalizing, and inspecting file names, separators, and URIs.

Engage in a coding exercise using Java 7 and 8 Files methods, including read all bytes, read all lines, write with append, create directories and files, copy, and delete.

Learn how Java 7 introduces watch service to monitor directories and files for create, delete, and modify events, using watch keys and polling to reset.

Learn Java 7 binary literals using 0b/0B prefixes to represent numbers in binary, with the JVM converting to int, long, short, or byte, and enabling bitwise and arithmetic operations.

Java 7 introduces strings in switch statements, highlighting case sensitivity and null constraints while showing how to group multiple cases to reduce code and improve readability.

Explore the diamond operator, Java seven's type inference for generics, enabling cleaner object creation for all collection types, like maps and lists, by inferring type parameters from the left-hand side.

Learn how Java 7 introduces underscores in numeric literals to improve readability, with the JVM removing them during processing and rules about placement near decimal points and type suffixes.

Explore jdbc improvements in java 7, including try-with-resources for auto closing connections, result sets, and statements, and use the rowset factory and rowset provider to create row sets.

Explore the garbage collector evolution in Java, including CMS limitations and the G1 collector introduced in Java seven, its region-based heap management, concurrent collection, and default status from Java nine.

Learn how the fork join framework divides tasks into subtasks, processes them in parallel with a fork join pool, and merges results. Java eight streams simplify this pattern.

Explore Java seven new features from a developer perspective, including try-with-resources, suppressed and multiple exceptions, improved Paths and Files APIs, binary literals, strings in switch, and diamond operator.

Explore how Java 8 transforms Java development with lambda programming, functional interfaces, and default and static methods in interfaces, alongside streams and modern framework compatibility.

Explore default methods in interfaces introduced in Java eight, their purpose for backward compatibility, and how to override or use them amid the diamond ambiguity.

Learn how default methods in interfaces add autopilot behavior with a default implementation, preserving backward compatibility while allowing overrides by implementing classes like Honda.

Learn how Java 8 enables static methods in interfaces to provide utility functionality, alongside default methods, and how to call them via the interface name.

Learn how static methods work in interfaces in Java seven and eight, including calling interface versus class static methods, no overriding, and using a static main in an interface for standalone execution.

Discover how the Java 8 optional class gracefully handles nulls and avoids null pointer exceptions, with creation methods empty, of, and ofNullable, and methods like isPresent and map.

Explore how Java 1.8 optional handles nulls and null pointer exceptions with methods like is present, is empty, if present, or else, map, and flat map.

Discover lambda expressions as Java 8's major feature, blending functional and object-oriented programming to write less code and pass behavior as data to methods.

Explore lambda expressions and their link to functional interfaces in Java 8, including the single abstract method rule, the functional interface annotation, and how lambdas reduce boilerplate.

Explore translating a single-parameter void method into a lambda expression using a functional interface, reducing boilerplate and enabling behaviors like print input, lowercase, and uppercase.

Explore writing lambda expressions for methods with two parameters via a two-parameter functional interface, including addition and print logic, and how lambdas reduce boilerplate.

Learn to write lambda expressions for methods with a return type using a two-parameter int function interface, including single-statement forms with optional return and arrow syntax.

Understand how lambda expressions power collections and streams, write concise lambdas with optional braces, pass behavior as arguments, and grasp scope rules and effective final variables.

Explore the predicate functional interface in java.util.function, including its test method, default chaining methods (and, negate), and the static isEqual, with stream examples filtering even numbers.

Explore the function functional interface in Java 8, including apply, identity, and chaining with and then and compose, and compare it with predicate for practical lambdas and streams.

Explore the unary operator functional interface, a Function<T, T> child, which takes input and returns the same type, using apply, compose, andThen, identity, for uppercasing strings and updating an employee.

Explore the consumer functional interface in Java, which accepts input with the accept method, performs actions, and returns no value, enabling practical use cases like persisting objects and triggering emails.

Explore the supplier functional interface, which returns a value with no input via get, and compare it to consumer as a getter-style example in Java 8 date usage examples.

Explore bi functional interfaces with two input parameters—bi predicate, bi function, and bi consumer—and binary operator with two inputs of the same data type and max by and min by.

Explore primitive type functional interfaces in Java, learn why auto boxing and unboxing affect performance, and discover int, long, double variants of predicates, functions, consumers, and more for efficient lambdas.

Explore primitive functional interfaces and how they avoid boxing and unboxing overhead, with a coding exercise illustrating int, long, and double predicates, functions, consumers, suppliers, unary, and binary.

Explore method references introduced in Java eight to reuse logic inside lambdas, covering static method references, object references, class instance method references, and constructor references with the double colon operator.

Explore static, instance, and constructor method references in Java, and learn how to map them to functional interfaces with lambda expressions for efficient coding.

Discover the streams API in Java eight, using java.util.stream to process collection data with lambda expressions, from collections or arrays, including parallel streams, without mutating the source.

Understand how a streams pipeline processes data by creating streams from collections or arrays, applying intermediate operations like map and filter, and using terminal operations to produce results.

Use the map method in streams api as an intermediate operation to transform each element with a lambda, such as turning department names to uppercase, producing a new stream.

Explore how the flatMap method in the streams API flattens multiple streams into one, contrasting it with map, with an example converting words like easy and bites into characters.

Filter streams as an intermediate operation applies a predicate lambda to select elements, producing a new stream of departments starting with s, then a terminal operation iterates them.

Explore limit, skip, distinct, sorted, and peek in streams API, learning how intermediate operations control data, handle infinite streams, and support map, flatMap, and iterate for effective processing.

Learn that streams in the Java Streams API are traversable only once; a terminal operation closes the stream, so create another stream from the data source to traverse again.

Master the reduce method in the streams api as a terminal operation that combines stream elements into a single value using a binary operator, with examples like sum and average.

Learn how the collect terminal operation gathers stream results using Collectors toList, toSet, toMap, and more. Practice counting, joining, minBy, maxBy, and reducing within Java 8 streams.

Explore the collecting and then method in streams collectors, using max by to identify the maximum priced product and a finisher to process the final data.

Use the groupingBy method from Collectors to group products by price. Leverage streams, lambdas, and method references to map price keys to product lists.

Learn how to partition a stream with the partitioning by method to split data into two groups based on a predicate, with price-based examples and lambda usage.

Learn the stream pipeline by creating a stream, applying filter, map, and sort ascending, then collecting results with collect to produce a list of odd numbers and their squares.

Learn parallel stream processing, where the JVM partitions data across cores and processes it in parallel for large data sets, and compare sequential streams. Parallel streams may not preserve order.

Explore the core differences between collections and streams in Java, including immutability, on-demand element generation, and lambda-friendly stream operations such as map and filter.

Explore the Java eight date and time api, designed to replace legacy date and calendar handling with thread-safe, intuitive classes like LocalDate, LocalDateTime, Instant, Duration, and Period for time zones.

Explore the local date class in the java.time API, an immutable date without time or time zone. Create dates with now or of(year, month, day) and parse strings.

Explore the LocalTime class inside the Joda date time API to create time objects, parse strings, and retrieve hour, minute, second, and nanoseconds, with plus and minus adjustments.

Explore the LocalDateTime class as a timezone-free composite of local date and local time, created by now or of, with conversions to date or time and plus, minus, and comparisons.

Explore how the java.time api simplifies time zones and daylight saving with zone id and zone offset, and how offset date time supports database storage and serialization.

Explore time zones and calendars in the Joda Date & Time API, including zone IDs, offset date time, daylight saving, and practical examples like zone conversion and Islamic calendar support.

Format and parse date time values with DateTimeFormatter in the Joda Date & Time API, using off pattern and pass methods for locale-aware, thread-safe formats.

Explore Java eight's CompletableFuture to implement asynchronous, non-blocking programming, using run async and supply async, and chain with then apply and then accept, while using get for synchronization.

Unlock Java 8 map enhancements with default methods, for each, sorting by key or value, and compute, get or default, remove, replace, and replace all using lambdas.

Explore Java 8's miscellaneous updates, including default methods in interfaces, lambda-enabled collection utilities (replace all, sort, for each, stream, join), and enhanced math, number, and boolean operations.

Explore Java 8 features: default and static interface methods, optional, lambda expressions and functional interfaces, method references, streams and parallel streams, the date time api, and completable future.