package com.test;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
class Employee implements Comparable{
private Integer rollNo;
private String name;
private Integer age;
public Employee(Integer rollNo, String name, Integer age) {
super();
this.rollNo = rollNo;
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "Employee [rollNo=" + rollNo + ", name=" + name + ", age=" + age + "]\n";
}
@Override
public int compareTo(Object o) {
Employee e = (Employee) o;
return this.rollNo.compareTo(e.rollNo);
}
}
public class Demo {
public static void main(String[] args) {
Employee emp = null;
List<Employee> list = new ArrayList<Employee>();
list.add( emp = new Employee(101, "Cheten", 36));
list.add( emp = new Employee(603, "Brijesh", 29));
list.add( emp = new Employee(308, "Ajay", 38));
list.add( emp = new Employee(902, "Mansi", 26));
list.add( emp = new Employee(327, "sunil", 40));
list.add( emp = new Employee(206, "Aman", 32));
list.add( emp = new Employee(490, "vimal", 25));
Collections.sort(list);
System.out.println(list);
}
}
package com.test;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class Employee{
public Integer rollNo;
public String name;
public Integer age;
public Employee(Integer rollNo, String name, Integer age) {
super();
this.rollNo = rollNo;
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "Employee [rollNo=" + rollNo + ", name=" + name + ", age=" + age + "]\n";
}
}
public class Demo {
public static void main(String[] args) {
Employee emp = null;
List<Employee> list = new ArrayList<Employee>();
list.add( emp = new Employee(101, "Cheten", 36));
list.add( emp = new Employee(603, "Brijesh", 29));
list.add( emp = new Employee(308, "Ajay", 38));
list.add( emp = new Employee(902, "Mansi", 26));
list.add( emp = new Employee(327, "sunil", 40));
list.add( emp = new Employee(206, "Aman", 32));
list.add( emp = new Employee(490, "vimal", 25));
Comparator<Employee> com = new Comparator<Employee>() {
@Override
public int compare(Employee o1, Employee o2) {
if(o1.rollNo > o2.rollNo)
return 1;
return -1;
}
};
System.out.println("Before sorting by rollNo : \n"+list);
Collections.sort(list,com);
System.out.println("After sorting by rollNo : \n"+list);
}
}
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