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Java Stream Sorting Example
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‎JavaStreamSortingExample/.idea/encodings.xml‎

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‎JavaStreamSortingExample/.idea/misc.xml‎

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‎JavaStreamSortingExample/.idea/modules.xml‎

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‎JavaStreamSortingExample/.idea/workspace.xml‎

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‎JavaStreamSortingExample/JavaStreamSortingExample.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎JavaStreamSortingExample/out/production/Java8Stream/com/javadevzone/Employee.class‎

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‎JavaStreamSortingExample/out/production/Java8Stream/com/javadevzone/StreamFlatMapExample.class‎

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‎JavaStreamSortingExample/out/production/Java8Stream/com/javadevzone/StreamSortingExample.class‎

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‎JavaStreamSortingExample/src/com/javadevzone/Employee.java‎

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package com.javadevzone;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* Created by java developer zone on 5/21/2017.
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*/
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public class Employee implements Comparable<Employee>{
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private int no;
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private String name;
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private String designation;
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private String gender;
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private Set<String> languages;
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public Set<String> getLanguages() {
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return languages;
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}
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public Employee(int no, String name, String designation, String gender , String [] languages) {
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this.no = no;
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this.name = name;
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this.designation = designation;
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this.gender = gender;
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this.languages = new HashSet<>(Arrays.asList(languages));
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}
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public void addLanguage(String language){
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this.languages.add(language);
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}
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public int getNo() {
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return no;
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}
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public void setNo(int no) {
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this.no = no;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getDesignation() {
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return designation;
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}
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public void setDesignation(String designation) {
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this.designation = designation;
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}
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public String getGender() {
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return gender;
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}
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public void setGender(String gender) {
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this.gender = gender;
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}
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@Override
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public String toString() {
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return this.no + " : " + this.name + " : " + gender + " : " + designation;
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}
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@Override
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public int hashCode() {
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int hashno = 7;
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hashno = 13 * hashno + (name == null ? 0 : name.hashCode());
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return hashno;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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final Employee std = (Employee) obj;
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if (this == std) {
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return true;
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} else {
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return (this.name.equals(std.name)
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&& (this.no == std.no)) && (this.designation.equals(std.designation))
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&& (this.gender.equals(std.gender));
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}
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}
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public static java.util.List<Employee> getEmployee() {
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java.util.List<Employee> employees = new ArrayList<>();
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employees.add(new Employee(1, "Bob", "Developer", "Male",new String[]{"java","scala"}));
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employees.add(new Employee(2, "Joy", "Sr. Developer", "Male",new String[]{"java"}));
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employees.add(new Employee(3, "John", "CEO", "Male",new String[]{"python","ruby"}));
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employees.add(new Employee(4, "Bat", "Developer", "Male",new String[]{"scala"}));
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employees.add(new Employee(5, "Jolly", "Developer", "Female",new String[]{"C","C++"}));
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employees.add(new Employee(6, "Bobby", "Developer", "Female",new String[]{".Net","VB"}));
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return employees;
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}
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@Override
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public int compareTo(Employee o) {
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return name.compareTo(o.getName());
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}
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}

‎JavaStreamSortingExample/src/com/javadevzone/StreamSortingExample.java‎

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package com.javadevzone;
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import java.util.*;
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import java.util.stream.Collectors;
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import java.util.stream.IntStream;
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import java.util.stream.Stream;
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/**
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* Created by java developer zone on 5/21/2017.
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*/
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public class StreamSortingExample {
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public void primitiveSort(){
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//Build IntStream
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IntStream intStream = IntStream.of(3, 2, 1, 2, 5);
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System.out.println("Sort IntStream");
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intStream.sorted().forEach(x -> System.out.print(x+","));//natural order sort & print
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//Build list of numbers
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List<Integer> numbers = Arrays.asList(3, 2, 1, 2, 5);
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System.out.println(System.lineSeparator()+"Sort list of int numbers");
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numbers.stream().sorted().forEach(x -> System.out.print(x+",")); //natural order sort & print
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}
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public void reverseSorting(){
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//Build list of numbers
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List<Integer> numbers = Arrays.asList(3, 2, 1, 2, 5);
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System.out.println(System.lineSeparator()+"Sort list of int numbers");
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numbers.stream().sorted(Comparator.reverseOrder()).forEach(x -> System.out.print(x+",")); //reverse order sort & print
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}
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public static void main(String[] args) {
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StreamSortingExample streamSortingExample = new StreamSortingExample();
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//streamSortingExample.primitiveSort();
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//streamSortingExample.reverseSorting();
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//streamSortingExample.listSorting();
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//streamSortingExample.setSorting();
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//streamSortingExample.MapSorting();
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streamSortingExample.userDefindObjectSorting();
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}
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public void userDefindObjectSorting(){
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List<Employee> employeeList = Employee.getEmployee();
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System.out.println("---Natural Sorting by No---");
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List<Employee> slist = employeeList.stream().sorted(Comparator.comparing(Employee::getNo)).collect(Collectors.toList());
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slist.forEach(e -> System.out.println("Id:"+ e.getNo()+", Name: "+e.getName()));
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}
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public void listSorting(){
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List<Employee> employeeList = Employee.getEmployee();
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System.out.println("---Sorting using Comparator by Gender--");
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List<Employee> slist = employeeList.stream().sorted(Comparator.comparing(Employee::getGender)).collect(Collectors.toList());
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slist.forEach(e -> System.out.println("Id:"+ e.getNo()+", Name: "+e.getName()+", Gender:"+e.getGender()));
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}
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public void setSorting(){
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HashSet<Employee> employeeSet = new HashSet<>(Employee.getEmployee());
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System.out.println("---Sorting using Comparator by Designation---");
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List<Employee> slist= employeeSet.stream().sorted(Comparator.comparing(Employee::getDesignation)).collect(Collectors.toList());
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slist.forEach(e -> System.out.println("Id:"+ e.getNo()+", Name: "+e.getName()+", Designation:"+e.getDesignation()));
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}
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public void MapSorting(){
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Map<Integer, String> map = new HashMap<>();
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map.put(2, "John");
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map.put(1, "gim");
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map.put(3, "orton");
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System.out.println("---Sort by Map Value---");
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map.entrySet().stream().sorted(Comparator.comparing(Map.Entry::getValue))
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.forEach(e -> System.out.println("Key: "+ e.getKey() +", Value: "+ e.getValue()));
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System.out.println("---Sort by Map Key---");
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map.entrySet().stream().sorted(Comparator.comparing(Map.Entry::getKey))
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.forEach(e -> System.out.println("Key: "+ e.getKey() +", Value: "+ e.getValue()));
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}
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}

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