Showing posts with label Comparable Example in Collection. Show all posts
Showing posts with label Comparable Example in Collection. Show all posts

Saturday 10 August 2013

Top Most Simple Comparable Example To Sort Custom Objects on Single Property


package com.myapp.test.collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Employee implements Comparable<Object> {
private String name;

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;
}

private int age;
private int salary;

@Override
public int compareTo(Object arg0) {
if (this.name.hashCode() > arg0.hashCode())
return 1;
else if (this.name.hashCode() < arg0.hashCode())
return -1;
else
return 0;
}

@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}

@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Employee other = (Employee) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}

public static void main(String[] args) {
List<String> datas = new ArrayList<String>();
datas.add("xyz");
datas.add("bcd");
datas.add("abc");

for (String string : datas) {
System.out.println(string);
}
Collections.sort(datas);

for (String string : datas) {
System.out.println(string);
}
System.out.println("======================");

List<Employee> employees = new ArrayList<Employee>();
Employee employee = new Employee();
employee.setName("xyz");
employee.setAge(20);
employee.setSalary(10000);
employees.add(employee);

Employee employee1 = new Employee();
employee1.setName("bcd");
employee1.setAge(20);
employee1.setSalary(10000);
employees.add(employee1);

Employee employee2 = new Employee();
employee2.setName("abc");
employee2.setAge(20);
employee2.setSalary(10000);
employees.add(employee2);

for (Employee localEmployee : employees) {
System.out.println(localEmployee.getName());
}
Collections.sort(employees);
for (Employee localEmployee : employees) {
System.out.println(localEmployee.getName());
}

}
}

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