- Lambdas are syntax for the Functional programming in Java
- Functional programming is separating data and behaviour
- Functional programming is a new approach to the programming
- With Lamdas ,Java is Now Object Oriented,Functional programming language
- Lambdas are not part of the Compiler.They are interpretaed in the JVM/JRE
- LocalDate
- LocalTime
- LocalDateTime
- Duration
- Period
- ZoneIds -TemporalAdjusters
- Follows Map/Filter/Reduce Alogirthms
- Stream is a declartion
- Stream can be consumed only once
- Map and Filter operations generate Intermediate Streams
- Reduce does the comuting
- Replace null with Optional.Empty;
- Ex: Person p=null; Person p=Optional.Empty
- Ways to create Optional
- From Empty
- Optional myval=Optional.empty();
- From Non Nullable
- Optional myval = Optional.of("test");
- From Nullable
- Optional optCar = Optional.ofNullable(car);
- From Empty
- Use Otopnal.isPresent to check the prescence of a value
- Use orElse orElseThrow to deviate when empty value is there
- String has the Support of IntStream for Operations
- StringJoiner is added to the Kitty to meet all needs of String Concatenation
- Forget String Buffer and String Builder from Java8
- Ex:
- StringJoiner sj=new StringJoiner(",","{","}");//First one is the Delimiter for concatenation floowed by Prefix and post fix
- String finalString=sj.add("one").add("two").add("Three").toString();
- System.out.println(finalString);
- Output:
- {one,two,Three}
- Map enhancements with putIfAbsent,ComputeIfAbsent etc
- Java NIO Streams Support
- Support for Plain Text ,URLS and Mime type is added
- Ex: Base64.Encoder encoder = Base64.getEncoder();
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