User Defined Object Sorting

public class ExampleComparator {

public static void main(String[] args) {

    List<Person> list = new ArrayList<Person>();

    list.add(new Person("shyam",24));

    list.add(new Person("jk",29));

    list.add(new Person("paul",30));

    list.add(new Person("ashique",4));

    list.add(new Person("sreeraj",14));

    for (Person person : list) {

        System.out.println(person.getName()+ "   "+ person.getAge());

    }

    Collections.sort(list,new PersonComparator());

    System.out.println("After sorting");

    for (Person person : list) {

        System.out.println(person.getName()+ "   "+ person.getAge());

    }

}

}

public class Person {

private int age;

private String name;

Person (String name, int age){

    setName(name);

    setAge(age);

}

public int getAge() {

    return age;

}

public void setAge(int age) {

    this.age = age;

}

public String getName() {

    return name;

}

public void setName(String name) {

    this.name = name;

}

}

public class PersonComparator implements Comparator<Person> {

@Override

public int compare(Person obj1, Person obj2) {

    return obj1.getAge() - obj2.getAge();

}

}

class Test {

    public int amount; //field u want to compare

    // ...

}

Write your custom comparator for this class:

class TestAmountComparator implements Comparator<Test> {

    @Override

    public int compare(Test t1, Test t2) {

        return Integer.valueOf(t1.amount).compareTo(Integer.valueOf(t2.amount))          

    }

}

To sort the list of your objects:

List<Test> list = new ArrayList<Test>(myTest); //your Test list

//sorting

Collections.sort(list, new TestAmountComparator()); //sort by amount

public class Person {

    private String name;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

public void someTest() {

    LinkedList<Person> persons = new LinkedList<Person>();

    persons.add(new Person());

    //add as many as you want

    Collections.sort(persons, new Comparator<Person>() {

        @Override

        public int compare(Person o1, Person o2) {

            return o1.getName().compareTo(o2.getName());

        }

    });

}