JDK 8 Stream Sorted () example __jdk8 sort

Original link: http://www.concretepage.com/java/jdk-8/java-8-stream-sorted-example
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This article will explain the Java 8 stream sorted () example, where we can sort a stream either in natural order or with a collation defined by the comparator interface. Comparator can be initialized with a Lambada expression, we can also reverse an already sorted stream.
Next we'll use Java 8 's streaming sorted to sort list, Map, Set
1, sorted () By default, the Order of natural order, which elements must implement comparable interface
2, Sorted (comparator< super t> Comparator): We can use Lambada to create a Comparator instance. You can sort the elements in ascending or descending order.
The following code sorts a list in natural order

Natural order reverse elements, using the Reverseorder () method provided by comparator

Use comparator to sort a list

To reverse the elements above

Stream sorted () with List

We sort a list collection of objects that assemble the student class. First we use the natural order, and then we use comparator to do ascending and descending, respectively:
Sortlist.java

Package com.concretepage;
Import java.util.ArrayList;
Import Java.util.Comparator;
Import java.util.List;
Import java.util.stream.Collectors; public class Sortlist {public static void main (string[] args) {list<student> List = new Arraylist<s
        Tudent> ();
        List.add (New Student (1, "Mahesh", 12));
        List.add (New Student (2, "Suresh", 15));

        List.add (New Student (3, "Nilesh", 10));
        SYSTEM.OUT.PRINTLN ("---Natural sorting by Name---");
        List<student> slist = List.stream (). Sorted (). Collect (Collectors.tolist ());

        Slist.foreach (E-> System.out.println ("Id:" + e.getid () + ", Name:" +e.getname () + ", Age:" +e.getage ()));
        SYSTEM.OUT.PRINTLN ("---Natural sorting by Name in reverse order---");
        Slist = List.stream (). Sorted (Comparator.reverseorder ()). Collect (Collectors.tolist ());        

        Slist.foreach (E-> System.out.println ("Id:" + e.getid () + ", Name:" +e.getname () + ", Age:" +e.getage ())); System.out.prINTLN ("---sorting using Comparator by age---");
        Slist = List.stream (). Sorted (comparator.comparing (student::getage)). Collect (Collectors.tolist ());

        Slist.foreach (E-> System.out.println ("Id:" + e.getid () + ", Name:" +e.getname () + ", Age:" +e.getage ()));
        SYSTEM.OUT.PRINTLN ("---sorting using Comparator by age and reverse order---");
        Slist = List.stream (). Sorted (Comparator.comparing (student::getage). Reversed ()). Collect (Collectors.tolist ());
    Slist.foreach (E-> System.out.println ("Id:" + e.getid () + ", Name:" +e.getname () + ", Age:" +e.getage ()));  }
}

* Student.java *

Package com.concretepage;
    public class Student implements comparable<student> {private int id;
    private String name;
    private int age;
        public Student (int ID, String name, int age) {this.id = ID;
        THIS.name = name;
    This.age = age;
    public int getId () {return id;
    Public String GetName () {return name;
    public int getage () {return age;
    @Override public int compareTo (Student ob) {return Name.compareto (Ob.getname ()); @Override public boolean equals (final Object obj) {if (obj = = null) {return FAL
          Se
          Final Student std = (Student) obj;
          if (this = = std) {return true;
          else {return (This.name.equals (std.name) && (this.age = = std.age));
          @Override public int hashcode () {int hashno = 7; Hashno = 13 * Hashno + (name = = null 0:name.hashcode ());
        return Hashno;  }   
}

* Output *

---Natural sorting by Name---
id:1, Name:mahesh, Age:12 id:3,
Name:nilesh, Age:10 id:2
, Name:suresh, age:15
---Natural sorting by Name in reverse order---
Id:2, Name:suresh, age:15
id:3, Name:nilesh, Age:10
id:1, Name:mahesh, age:12
---sorting using Comparator b Y Age---
id:3, Name:nilesh, Age:10
id:1, Name:mahesh, Age:12
id:2, Name:suresh, age:15
---sorting us ing Comparator by age with reverse order---
id:2, Name:suresh, age:15
id:1, Name:mahesh, Age:12