I have java custom class i.e Employee having below fields,

public class Employee {
     private String name;
     private String dept;
     private Integer age;
     private Double salary;
}

public Employee(String name, String dept, Integer age, Double salary) {
    this.name = name;
    this.dept = dept;
    this.salary = salary;
    this.age = age;
}
//getter and setters

My list object has below data,

List<Employee> list = Arrays.asList(
            new Employee("mahesh", "IT", 25, 1000.00), 
            new Employee("rajesh", "IT", 30, 1200.00), 
            new Employee("Saket", "IT", 30, 1000.00), 
            new Employee("Samuel", "IT", 30, 1150.00), 
            new Employee("Anil", "Eng", 29, 2000.00),
            new Employee("Sachin", "Eng", 29, 2000.00));

I have to iterate this list and updated list should return first, third, fifth and sixth records.
group the records using department and salary and if the grouping count greater than 1 those records should return.
In the above example, second and fourth it’s occured one time as grouping so those records should skip.

So final List should contain these records,

 List<Employee> list = Arrays.asList(
            new Employee("mahesh", "IT", 25, 1000.00), 
            new Employee("Saket", "IT", 30, 1000.00), 
            new Employee("Anil", "Eng", 29, 2000.00),
            new Employee("Sachin", "Eng", 29, 2000.00));

Need to group based on two fields i.e department and salary and the stream api should return updated list.