Join or concatenate or combine multiple strings in java (example)
1. Different methods to join or concatenate strings in java Join String using + operator Combine String using String concat method Contact String […]
Java 8
Primitive streams example in java8 (IntStream, LongStream, DoubleStream)
Java stream library have streams specifically for primitive types like int, long, double etc. With primitive streams, values are directly
groupBy, mapping & statistics features in Java8 lambda stream (examples)
Java 8 Stream: groupBy, mapping and statistics, lambda stream example. Discussed IntSummaryStatistics (min,max,avg) of List of Person objects.
Convert list of objects to/from JSON in java (jackson objectmapper/ example)
Given a list of user defined objects, we would like to convert list of pojo objects to JSON (and JSON to list
Convert Array of Objects to / from JSON – Jackson ObjectMapper
Given an array of user defined objects, we would like to convert array of object to JSON and JSON to array
Convert Map to/from JSON string in java (jackson objectmapper/ example)
Given Map of String & object (Map<String,Object>), we would like to convert Map to/from JSON. We will use the jackson’s objectmapper to serialize
Convert list of objects to /from map in java 8 lambda stream (example)
Given the list of objects, convert list of objects to map. We will use lambda streams to convert list objects
Date serialization & deserialization – POJO to JSON (GSON & example)
Given the user defined object or POJO, having Date field, we would like to serialize the POJO to JSON. During serialization, we would
Serialize/ convert list of objects to/from json in java (Gson & example)
Given an list of user defined objects, we would like to convert list of pojo objects to JSON (and JSON to list
Convert /Serialize array of objects to / from json in java (Gson /example)
Given an array of user defined objects , we need to convert array of POJOs to JSON String. Also, we will convert
Serialize /Convert Map of object to/from JSON in java (GSON /example)
Given the Map of String and object (Map<String,Object>), we would like to convert Map to JSON and vice versa. We will use the
Read a file line by line using java 8 lambda stream (example)
1. Read file using java 8 lambda stream Given a file, read input file by line by line using lambda
Impact of interface’s default method on multiple inheritance (Java 8 /example)
Java 8 has introduced default method for interfaces, which provides the default implementation of method. Prior to java 8 interfaces
Java 8 Functional interface explained with examples (Comparator)
1. What is functional interface in java8? The interface having one abstract method is called functional interface. The interface can
Create runnable task using functional interface – java8 lambda stream (example)
1. Functional Interface java 8: The interface having one abstract method is called the functional interface. E.g. Comparator, Runnable interface.
Convert/ Serialize Object /POJO to /from JSON String in java (Gson & example)
Given a user defined object, we would like to convert Object( or POJO) to JSON and vice versa. We will use the Google gson
Find object from arraylist of objects using lambda stream java 8 (example)
Given the arraylist of user defined objects or POJO (let we have person class). List <Person> personList Find or Search
Find/ search String object from arraylist collection of objects – stream lambda java 8 (example)
Given an arraylist collection of String objects, We would like to find object from arraylist. We will iterate through the list of
Sort objects on multiple fields /properties – Comparator interface (lambda stream java 8)
Given a the list of objects, we need to sort the objects by their multiple properties. We have used java 8 streams to sort the objects. In below example, we have take the Person object. We will sort the list of person objects by their firstName. Also we have shown the cascaded sorting wherein we have sorted the list on multiple fields.We have performed the following operations.
Filter/Remove null & empty string from array – lambda stream java8 (example)
Given the strings of array containing nulls and empty string. We will be using Java 8 streams to filter out null and empty string in strings of array. Let us take a complete example to filter out null and empty string
Filter/remove null element/String from arraylist of objects – lambda stream java8 (example)
Suppose we are given the List collection containing the String values, we will remove the null values from list collections using filter of Java 8. Let us take a look into the below example
Convert one/ heterogeneous object into another – stream lambda (java8 /example)
Generally in our application we need to convert one object into another type. We can not directly transform one object to another. In traditional way we need to iterate source object and convert to destination object. We will be using Java 8 lamdas to translate one object into another.
Join or combine two / multiple Strings using StringJoiner in java8 (example)
Java 8 have StringJoiner class which will be used to join strings using delimiter. Also we can combine strings using prefix and suffix strings.