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Employee.java
TreeSetExample.java
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Employee.java
public class Employee implements Comparable<Object> { private String name; private int age; private int salary; public Employee(String name, int age, int salary) { super(); this.name = name; this.age = age; this.salary = salary; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getSalary() { return salary; } public void setSalary(int salary) { this.salary = salary; } @Override public String toString() { return "Employee [name=" + name + ", age=" + age + ", salary=" + salary + "]"; } /* * This method has logic to arrange the employee objects in descending order * based on the Age. */ @Override public int compareTo(Object object) { Employee employee = (Employee) object; System.out .print("CompareTo method has been called to arrange the employee objects in descending order based on the Age, "); System.out.println("this.getAge()= " + this.getAge() + ", employee.getAge()=" + employee.getAge() + "\n"); if (this.getAge() > employee.getAge()) { return -1; } else { return 1; } } }
import java.util.TreeSet; /* * Storing user-defined class objects. */ public class TreeSetExample { public static void main( String[] args ) { TreeSet<Employee> treeSet = new TreeSet<Employee>(); Employee john = new Employee("John", 20, 40000); Employee david = new Employee("David", 10, 80000); Employee peter = new Employee("Peter", 30, 150000); System.out.println(john + " is going to be add in treeSet"); treeSet.add(john); System.out.println(david + " is going to be add in treeSet"); treeSet.add(david); System.out.println(peter + " is going to be add in treeSet"); treeSet.add(peter); System.out.println("treeSet : " + treeSet + "\n"); System.out.println("--------------------------------------------"); /* * Using for each loop getting each employee object from the treeSet */ for( Employee employee : treeSet ) { System.out.println("Employee Age : "+employee.getAge()); System.out.println("Employee Name : "+employee.getName()); System.out.println("Employee Salary :"+ employee.getSalary()); System.out.println("--------------------------------------------"); } } }
Employee [name=John, age=20, salary=40000] is going to be add in treeSet CompareTo method has been called to arrange the employee objects in descending order based on the Age, this.getAge()= 20, employee.getAge()=20 Employee [name=David, age=10, salary=80000] is going to be add in treeSet CompareTo method has been called to arrange the employee objects in descending order based on the Age, this.getAge()= 10, employee.getAge()=20 Employee [name=Peter, age=30, salary=150000] is going to be add in treeSet CompareTo method has been called to arrange the employee objects in descending order based on the Age, this.getAge()= 30, employee.getAge()=20 treeSet : [Employee [name=Peter, age=30, salary=150000], Employee [name=John, age=20, salary=40000], Employee [name=David, age=10, salary=80000]] -------------------------------------------- Employee Age : 30 Employee Name : Peter Employee Salary :150000 -------------------------------------------- Employee Age : 20 Employee Name : John Employee Salary :40000 -------------------------------------------- Employee Age : 10 Employee Name : David Employee Salary :80000 --------------------------------------------
https://sites.google.com/site/javaee4321/java-collections/TreeSetDemoEmployeeAgedescComparable.zip?attredirects=0&d=1
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