Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
- Awesome Book
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- Streams
- Collect Elements of a Stream into a Collection
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- Creating a Frequency Map
- Creating a Stream
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- Finding the First Element that Matches a Predicate
- Flatten Streams with flatMap()
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- Infinite Streams
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- Stream operations categories
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- Using Streams
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- Using Streams to Implement Mathematical Functions
- String Tokenizer
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- sun.misc.Unsafe
- super keyword
- The Classpath
- The Java Command - 'java' and 'javaw'
- The java.util.Objects Class
- ThreadLocal
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- Type Conversion
- Unit Testing
- Using Other Scripting Languages in Java
- Using the static keyword
- Using ThreadPoolExecutor in MultiThreaded applications.
- Varargs (Variable Argument)
- Visibility (controlling access to members of a class)
- WeakHashMap
- XJC
- XML Parsing using the JAXP APIs
- XML XPath Evaluation
- XOM - XML Object Model
Java Language Streams Finding Statistics about Numerical Streams
Example
Java 8 provides classes called IntSummaryStatistics, DoubleSummaryStatistics and LongSummaryStatistics which give a state object for collecting statistics such as count, min, max, sum, and average.
Java SE 8
List<Integer> naturalNumbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
IntSummaryStatistics stats = naturalNumbers.stream()
.mapToInt((x) -> x)
.summaryStatistics();
System.out.println(stats);
Which will result in:
Java SE 8
IntSummaryStatistics{count=10, sum=55, min=1, max=10, average=5.500000}
