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‎00-Fundamental-Practice/.idea/.gitignore‎

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‎00-Fundamental-Practice/.idea/00-Fundamental-Practice.iml‎

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‎00-Fundamental-Practice/.idea/misc.xml‎

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‎00-Fundamental-Practice/.idea/modules.xml‎

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‎00-Fundamental-Practice/.idea/vcs.xml‎

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‎00-Fundamental-Practice/Streams/Notes.txt‎

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‎00-Fundamental-Practice/Streams/Stream-interview-common-interview-questions/demoApplication/DemoApplication.java‎

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package demoApplication;
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import java.util.List;
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import java.util.Arrays;
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import java.util.Map;
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import java.util.Set;
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import java.util.stream.Collectors;
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public class DemoApplication {
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static List<Employee> employeeList = Arrays.asList(
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new Employee(1,"Abraham",32,"IT","Mumbai",20000,"Male"),
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new Employee(2,"Mary",21,"Sales","Chennai",25000,"Female"),
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new Employee(3,"Joe",32,"IT","Chennai",22000,"Male"),
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new Employee(4,"John",27,"Sales","Gurgaon",29000,"Male"),
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new Employee(5,"Liza",54,"Sales","Bangalore",32000,"Female"),
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new Employee(6,"Peter",33,"Admin","Mumbai",31500,"Male"),
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new Employee(7,"Harry",35,"Research","Kochi",21000,"Male"),
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new Employee(5,"Romit",25,"Research","Kanpur",21000,"Male")
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);
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public static void main(String[] args) {
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System.out.println(" Here are the solution of the 15 questions : ");
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//1.Find the list of employees whose name starts with "A".
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List<Employee> employeeWhoseNameStartsWithA = employeeList.stream().filter(employee -> employee.getName().startsWith("A")).collect(Collectors.toList());
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System.out.println("Employees whose name starts with A \n" +employeeWhoseNameStartsWithA);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//2.Group the employees by Department names.
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Map<String, List<Employee>> employeesWithDeptName = employeeList.stream().collect(Collectors.groupingBy(Employee::getDapartName));
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System.out.println("List of employees with department names ");
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employeesWithDeptName.forEach((dept,empList) -> {
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System.out.println(dept);
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empList.forEach(emp -> {
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System.out.println(emp.getId());;
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System.out.println(emp.getName());;
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System.out.println(emp.getAge());;
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System.out.println(emp.getDapartName());;
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System.out.println( emp.getAddress());;
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System.out.println(emp.getSalary());
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System.out.println(emp.getGender());
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});
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System.out.println("-----------------------------------------------------------------------------");
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});
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//3.Find the total count of employees using stream.
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long count = employeeList.stream().count();
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System.out.println("Total number of employees : " + count);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//4.Find the max age of employees.
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int maxAge = employeeList.stream().mapToInt(Employee::getAge).max().getAsInt();
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System.out.println("Max Age : " + maxAge);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//5.Find all department names.
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Set<String> allDeptNames = employeeList.stream().map(Employee::getDapartName).collect(Collectors.toSet());
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System.out.println("All department names : " +allDeptNames);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//6.Find the count of employees in each department.
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Map<String, Long> employeeCountByDept = employeeList.stream().collect(Collectors.groupingBy(Employee::getDapartName, Collectors.counting()));
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System.out.println("Employee count by department");
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employeeCountByDept.forEach((dept,value) ->{
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System.out.println(dept +" : "+ value);
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} );
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//7.Find the list of employees whose age is less than 30.
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Set<Employee> ageLessThan30 = employeeList.stream().filter(employee -> employee.getAge() < 30).collect(Collectors.toSet());
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System.out.println("Employees having age less than 30"+ageLessThan30);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//8.Find the list of employees whose age is between 26 and 31
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List<Employee> ageBetween26and31 = employeeList.stream().filter(employee -> employee.getAge() < 31 && employee.getAge() > 26).collect(Collectors.toList());
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System.out.println("Employees having age between 26 and 31"+ageBetween26and31);
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//9.Find the average age of male and female employees.
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Map<String, Double> avgAgeOfMaleAndFemale = employeeList.stream().collect(Collectors.groupingBy(Employee::getGender, Collectors.averagingDouble(Employee::getAge)));
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System.out.println("Average age of Male and Female employees :");
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avgAgeOfMaleAndFemale.forEach((gender,age) ->{
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System.out.println(gender +" : "+ age );
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});
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//10.Find the department who is having the maximum number of employees.
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Map.Entry<String, Long> deptMaxEmp = employeeList.stream().collect(Collectors.groupingBy(Employee::getDapartName, Collectors.counting())).entrySet().stream().max(Map.Entry.comparingByValue()).get();
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System.out.println("Department having maximum number of employees is \n"+ deptMaxEmp.getKey() +" \nand the employees number is "+deptMaxEmp.getValue());
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//11.Find the Employee who stays in Delhi and sort them by their names.
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//12.Find the average salary in all department.
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//13.Find the highest salary in each department.
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//14.Find the list of employee and sort them by their salary.
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//15.Find the employee who as second highest salary.
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System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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}
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}

‎00-Fundamental-Practice/Streams/Stream-interview-common-interview-questions/demoApplication/Employee.java‎

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package demoApplication;
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public class Employee{
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private int id;
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private String name;
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private int age;
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private String dapartName;
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private String address;
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private double salary;
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private String gender;
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public Employee(int id, String name, int age, String dapartName, String address, double salary, String gender) {
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this.id = id;
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this.name = name;
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this.age = age;
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this.dapartName = dapartName;
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this.address = address;
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this.salary = salary;
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this.gender = gender;
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}
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@java.lang.Override
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public java.lang.String toString() {
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return "Employee{" +
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"id=" + id +
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", name='" + name + '\'' +
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", age=" + age +
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", dapartName='" + dapartName + '\'' +
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", address='" + address + '\'' +
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", salary=" + salary +
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", gender='" + gender + '\'' +
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'}';
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}
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public Employee() {
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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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 int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public String getDapartName() {
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return dapartName;
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}
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public void setDapartName(String dapartName) {
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this.dapartName = dapartName;
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}
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public String getAddress() {
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return address;
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}
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public void setAddress(String address) {
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this.address = address;
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}
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public double getSalary() {
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return salary;
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}
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public void setSalary(double salary) {
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this.salary = salary;
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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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}

‎00-Fundamental-Practice/out/production/00-Fundamental-Practice/demoApplication/DemoApplication.class‎

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‎00-Fundamental-Practice/out/production/00-Fundamental-Practice/demoApplication/Employee.class‎

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