Sorting Using Comparator

package java8examples;

import java.math.BigDecimal;
//import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class TestSorting {
public static void main(String[] args) {

List<Developer> listDevs = getDevelopers();

System.out.println("Before Sort");
for (Developer developer : listDevs) {
System.out.println("ID : "+developer.getId()+" DEV Name : "+developer.getName());
}

//sort by age
Collections.sort(listDevs, new Comparator<Developer>() {
@Override
public int compare(Developer o1, Developer o2) {
return o1.getId() - o2.getId();
}
});

System.out.println("After Sort");
for (Developer developer : listDevs) {
System.out.println("ID : "+developer.getId()+" DEV Name : "+developer.getName());
}

}



private static List<Developer> getDevelopers() {

List<Developer> result = new ArrayList<Developer>();

result.add(new Developer("mkyong", 33));
result.add(new Developer("alvin", 20));
result.add(new Developer("jason", 10));
    result.add(new Developer("iris", 55));

return result;

}


}

===========

package java8examples;

import java.math.BigDecimal;

public class Developer {

String name;

int id;

String designation;

String project;

public Developer(String name, int id) {

super();

this.name = name;

this.id = id;

}

public Developer(String string, BigDecimal bigDecimal, int i) {

// TODO Auto-generated constructor stub

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getDesignation() {

return designation;

}

public void setDesignation(String designation) {

this.designation = designation;

}

public String getProject() {

return project;

}

public void setProject(String project) {

this.project = project;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + id;

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Developer other = (Developer) obj;

if (id != other.id)

return false;

return true;

}

}