Sort single or multiple fields in Java

To sort a single field or multiple fields in Java

Import Java.util.arraylist;import java.util.collections;import java.util.comparator;import java.util.List;/** * @     date:2015 June 19 Morning 10:11:44 */public class Collectiontest {/** * Main method * * @param args * parameter        * @modify by User: {modifier} June 19, 2015 * @modify by reason:{cause} */public static void main (string[] args) {        List<collectiontest.man> mans = New Arraylist<collectiontest.man> ();        Collectiontest collectiontest = new Collectiontest ();        Man mans = Collectiontest.new Man ();        Man.setparentid (11);        Man.setage (12);        Man.setname ("xxx 1_ children");        Mans man2 = Collectiontest.new man ();        Man2.setparentid (2);        Man2.setage (13);        Man2.setname ("xxx 2_ children");        Mans MAN3 = Collectiontest.new man ();        Man3.setparentid (2);        Man3.setage (16);        Man3.setname ("xxx 1_ children");        Mans.add (man);        Mans.add (MAN2);        Mans.add (MAN3);        Sortage (Mans); System.out.println ("*Sorted by age ******** ");        System.out.println (Mans.tostring ());        Sortparentidage (Mans);        SYSTEM.OUT.PRINTLN ("* * * * * * * Based on Parent ID, age ********");    System.out.println (Mans.tostring ()); }/** * Sorted by Parent ID, age * * @param mans * Person list * @modify by User: {modified by} June 19, 2015 * @m Odify by reason:{Reason} */private static void Sortparentidage (List<man> mans) {Collections.sort (Mans, N EW comparator<man> () {@Override public int compare (Mans O1, man O2) {if (o1.ge                Tparentid (). Equals (O2.getparentid ())) {return o1.getage (). CompareTo (O2.getage ());                } else {return O1.getparentid (). CompareTo (O2.getparentid ());    }            }        }); }/** * Sorted by Parent ID * * @param mans * @modify by User: {modified by} June 19, 2015 * @modify by reason:{Reason} * /private static void Sortage (List<man> mans) {CollectioNs.sort (Mans, New Comparator<man> () {@Override public int compare (Mans O1, man O2) {            Return O1.getage (). CompareTo (O2.getage ());    }        });        } public class Man {private Integer parentid;        Private Integer age;        private String name;            /** * Get parentid * * @return parentid ParentID */public Integer Getparentid () {        return parentid; }/** * Set ParentID * * @param parentid * parentid * * Pub        LIC void Setparentid (Integer parentid) {this.parentid = ParentID; }/** * Gets the age * @return The age of age */public Integer getage () {R        Eturn age; }/** * Set age * @param age * age */public void Setage (Integer Age)       {this.age = age; }/** * Gets name * * @return Name Name * * Public String getName () {        return name; }/** * Set name * * @param name * Name * * public void Set        Name (String name) {this.name = name;        }/** * @return * @modify by User: {modifier} June 19, 2015 * @modify by reason:{cause} */  @Override public String toString () {return ' man [parentid= ' + ParentID + ", age=" + Age + ", name="        + name + "]"; }    }}

Sort single or multiple fields in Java