Sorting an array of objects and returning another variable

Hi there,
Bit stuck on this one I wonder if anyone can help..
I have an object array into which I've pushed a number of objects with different variables :-
myArray.push({myRef: 1, myValue: "W"});
I can sort the array in numerical order using :-
myArray.sortOn("myRef", Array.NUMERIC);
but after sorting I would like to collapse the array using something along the lines of :-
myArray.join("");
to join the OTHER variable (myValue)...
Is it possible to do this without pushing every instance of 'myValue' to another array and then joining that ?
Many Thanks in advance
Martin

Hi kglad,
I really appreciate you helping, but I have had to completely change my approach to this problem, therefore I will be marking the question as answered !!
Thanks again

Similar Messages

Sorting an array of Objects based on a variable inside each object

I have a class public class handInfo
          //VARS
               int highC = 0;
               int hVal = 0;
               int numHand = 0;
          //CONSTRUCOTRS
               public handInfo()
          //METHODS
               public void setHC(int hc)
                         highC = hc;
               public void setHV(int hv)
                         hVal = hv;
               public void setNH(int nh)
                         numHand = nh;
               public int getHC()
                         return highC;
               public int getHV()
                         return hVal;
               public int getNH()
                         return numHand;
     }now i have an array, handInfo[] hands = new handInfo[4];
                    hands[0] = new handInfo();
                    hands[0].setHC(HV);
                    hands[0].setNH(1);
                    hands[0].setHV(Val);
                    hands[1] = new handInfo();
                    hands[1].setHC(HV2);
                    hands[1].setNH(2);
                    hands[1].setHV(Val2);
                    hands[2] = new handInfo();
                    hands[2].setHC(HV3);
                    hands[2].setNH(3);
                    hands[2].setHV(Val3);
                    hands[3] = new handInfo();
                    hands[3].setHC(HV4);
                    hands[3].setNH(4);
                    hands[3].setHV(Val4);i need to know how to sort this array, based off hVal...
D:

Write a Comparator and call Arrays.sort(array, Comparator).

How to sort an array of objects?

I need to sort an array of objects. Each object has serial number, and other properties. I need to sort it by serial number.

Do a java.util.Arrays.sort(). The method has quite a few overloads, so I'll give a complete example this time:import java.util.*
public class SortDemo {
    public static void main(String args) {
        SimpleObject[] objs = new SimpleObject[10];
        for (int i=0; i<10; i++)
            objs=new SimpleObject();
dump(objs);
Comparator c = new SimpleComparator();
Arrays.sort(objs, c);
dump(objs);
static void dump(Object[] o) {
for (int i=0; i<o.length; i++)
System.out.print(o[i] + " ");
/** Object to demonstrate comparing with **/
class SimpleObject {
private int n = (int) (10*Math.random());
public String toString() {
return String.valueOf(getNumber());
public int getNumber() {return n;}
/** The custom comparator **/
class SimpleComparator implements Comparator {
public int compare(Object o1, Object o2) {
return ((SimpleObject) o1).getNumber() - ((SimpleObject) o2).getNumber();
public boolean equals(Object o) {return false;}
}I could have made the SimpleObject class "Comparable", but a design like this allows more flexibility so I decided to use another class for the Comparator.

Sorting an array of objects by an attribute

I'm pretty new to java so don't laugh if you think my question is real easy!
I have an array of objects and I want to sort them according to an integer value stored in each object. Any help would be very much appreciated.
Thanks for looking!!

Perhaps an example would help:
public class Person {
private String name;
private int age;
public void setName(String name) { this.name = name; }
public void setAge(int age) { this.age = age; }
public String getName() { return name; }
public int getAge() { return age; }
=====
public class PersonAgeSorter implements Comparable {
public int compare(Object o1, Object o2) {
    Person p1 = (Person) o1;
    Person p2 = (Person) o2;
    Integer i1 = new Integer(p1.getAge());
    Integer i2 = new Integer(p2.getAge());
    return i1.compareTo(i2);
=====
public class PersonNameSorter implements Comparable {
public int compare(Object o1, Object o2) {
    Person p1 = (Person) o1;
    Person p2 = (Person) o2;
    String s1 = p1.getName();
    String s2 = p2.getName();
    return s1.compareTo(s2);
=====
import java.util.Arrays;
public class SortExample {
public static void main(String [] args) {
Person p1 = new Person();
Person p2 = new Person();
p1.setName("Tom");
p1.setAge(22);
p2.setName("Nancy");
p2.setAge(33);
Person [] people = new Person[2];
people[0] = p1;
people[1] = p2;
Arrays.sort(people, new PersonAgeSorter());
Arrays.sort(people, new PersonNameSorter());
}

Sorting an array of objects

hi there, i have to sort an array of object that looks like:
surname, name, age, height
well i have to sort them alphabetically like this:
based on the surnames, if the surnames are the same than sort on the base of the names; if the names are the same sort them on the base of age and so on. If all the fields are the same the order is non important.
Well I am not sure how I can do it using the Comparable Interface? as it is an interface i don't have any idea how to implement it

This search took 2 seconds to do. And it's using your exact subject header. Next time try searching, instead of waiting forever hoping that someone will help you.
http://search.java.sun.com/search/java/index.jsp?col=javaforums&qp=&qt=%2B%22sorting+an+array+of+objects%22

Property List error: Unexpected character b at line 1 / JSON error: JSON text did not start with array or object and option to allow fragments not set.

Hi,
I have a MBP 13' Late 2011 and Yosemite 10.10.2 (14C1514).
Until yesterday, I was using Garmin ConnectIQ SDK and all was working fine.
Yesterday, I've updated my system with latest security updates and Xcode updates too (Version 6.2 (6C131e)).
Since, I can't launch the ConnectIQ simulator app, I have this message in console :
8/04/2015 15:19:04,103 mds[38]: There was an error parsing the Info.plist for the bundle at URL Info.plist -- file:///Volumes/Leto/connectiq-sdk-mac-1.1.0_2/ios/ConnectIQ.bundle/
The data couldn’t be read because it isn’t in the correct format.
<CFBasicHash 0x7fa64f44e9a0 [0x7fff7dfc7cf0]>{type = immutable dict, count = 2,
entries =>
0 : <CFString 0x7fff7df92580 [0x7fff7dfc7cf0]>{contents = "NSDebugDescription"} = <CFString 0x7fa64f44f0a0 [0x7fff7dfc7cf0]>{contents = "Unexpected character b at line 1"}
1 : <CFString 0x7fff7df9f5e0 [0x7fff7dfc7cf0]>{contents = "kCFPropertyListOldStyleParsingError"} = Error Domain=NSCocoaErrorDomain Code=3840 "The data couldn’t be read because it isn’t in the correct format." (Conversion of string failed.) UserInfo=0x7fa64f44eda0 {NSDebugDescription=Conversion of string failed.}
I have looked at this file and it looks like a binary plist
bplist00ß^P^V^A^B^C^D^E^F^G^H
^K^L^M^N^O^P^Q^R^S^T^U^V^W^X^Y^Z^[^\^]^^^_ !"$%&'()'+,^[\CFBundleNameWDTXcodeYDTSDKName_^P^XNSHumanReadableCopyrightZDTSDKBuild_^P^YCFBundleDevelopmentRegion_^P^OCFBundleVersi on_^P^SBuildMachineOSBuild^DTPlatformName_^P^SCFBundlePackageType_^P^ZCFBundleShortVersionString_^P^ZCFBundleSupportedPlatforms_^P^]CFBundleInfoDictionaryVersion_^P^RCFBundleE xecutableZDTCompiler_^P^PMinimumOSVersion_^P^RCFBundleIdentifier^UIDeviceFamily_^P^QDTPlatformVersion\DTXcodeBuild_^P^QCFBundleSignature_^P^ODTPlatformBuildYConnectIQT0611[iph oneos8.1o^P-^@C^@o^@p^@y^@r^@i^@g^@h^@t^@ ^@©^@ ^@2^@0^@1^@5^@ ^@G^@a^@r^@m^@i^@n^@.^@ ^@A^@l^@l^@ ^@r^@i^@g^@h^@t^@s^@ ^@r^@e^@s^@e^@r^@v^@e^@d^@.V12B411RenQ1V14C109Xiphoneos TBNDLS1.0¡#XiPhoneOSS6.0YConnectIQ_^P"com.apple.compilers.llvm.clang.1_0S8.1_^P^Tcom.garmin.ConnectIQ¡*^P^AW6A2008aT????^@^H^@7^@D^@L^@V^@q^@|^@<98>^@ª^@À^@Ï^@å^A^B^A^_^A?^AT^ A_^Ar^A<87>^A<96>^Aª^A·^AË^AÝ^Aç^Aì^Aø^BU^B\^B_^Ba^Bh^Bq^Bv^Bz^B|^B<85>^B<89>^B<93>^B¸^B¼^BÓ^BÕ^B×^Bß^@^@^@^@^@^@^B^A^@^@^@^@^@^@^@-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^Bä
I guess it is a normal format but my system seems to be unable to read binary plist ?
I tried some stuff with plutil
plutil -lint Info.plist
Info.plist: Unexpected character b at line 1
Same for convert
plutil -convert xml1 Info.plist
Info.plist: Property List error: Unexpected character b at line 1 / JSON error: JSON text did not start with array or object and option to allow fragments not set.
I also try to download a fresh version of the connectIQ SDK and no changes.
Any idea ?
Thanks

Step by step, how did you arrive at seeing this agreement?

Populating a dynamic array with objects and managing it in runtime.

So I'm another stuck firstyear. I'll try and make my question compact. I'm using Flash CS6 and have drawn an animated character on the stage that consists of separate parts that are animated and its head is a separate class/symbol entirely because it has not only animation, but a state switch timeline as well. This said Head extends the Main that is the character MovieClip.
I am using a dynamic array to store and .push and .splice objects of another class that would collide with this said Head.
I also discovered the super() function that is implicitly called as the constructor of the parent in any child class that extends the parent, in this case Head extends Main. The issue is that my collidable object array is populated within the main, within the function that spawns every next collidable object with a TimerEvent. This said function then gets called twice due to the super() call.
I have tried putting this super() call into an impossible statement in my child class, but it doesn't change a thing, and it was said that this method is unsafe so I don't even know if it should be working.
However what confuses me the most is when I trace() the .length of my collidable object array at the end of that function. As I said earlier, the original function both spawns an object after a period of Timer(1000) and adds it to the stage as well as adds the object onto the object array, but the super() constructor only duplicates the length call and a creates a copy of the object on the stage, but it does not add the second copy of the object onto the array. The trace() output goes on like so:
1
1
2
2
3
3
4
4
etc.
I wonder why and I'm really stumped by this.
Here is the code in question:
public class Main extends MovieClip {
                    public var nicesnowflake: fallingsnow;
                    var nicesnowflakespawntimer: Timer = new Timer(1000);
                    public var nicesnowflakearray: Array = new Array();
                    public function Main() {
                              nicesnowflakespawntimer.addEventListener(TimerEvent.TIMER, nicesnowflakespawn);
                              nicesnowflakespawntimer.start();
                    public function nicesnowflakespawn(event:TimerEvent) : void {
                              nicesnowflake = new fallingsnow;
                              nicesnowflake.x = Math.random()* stage.stageWidth;
                              nicesnowflake.y = - stage.stageHeight + 100;
                              nicesnowflakearray.push(nicesnowflake);
                              stage.addChild(nicesnowflake);
                              trace(nicesnowflakearray.length);
                              for (var i:Number = 0; i < nicesnowflakearray.length; i++){
                                        nicesnowflakearray[i].addEventListener(Event.ENTER_FRAME, snowhit);
                    public function snowhit(event:Event) : void {
                              if (nicesnowflakearray[0].y >= 460){
                                        if (nicesnowflakearray[0].y == stage.stageHeight) {
                                        nicesnowflakearray.splice(nicesnowflakearray.indexOf(nicesnowflake), 1);
                              //if (this.hitTestObject(nicesnowflake)){
                                        //trace("hit");
I am also fiddling with the collision, but I believe that it would sort itself out when I deal with the array pop and depop properly. However I'm pasting it anyway in case the issue is subtly hidden somewhere I'm not looking for it. And here is the child class:
public class Head extends Main {
                    public function Head(){
                              if (false){
                                        super();
                              this.stop();
So like what happens at the moment is that the array gets populated by the first object that spawns, but there is two objects on the stage, then when the objects reach stage.460y mark the array splices() the one object away and displays an error:
"#1010: A term is undefined and has no properties.
          at Main/snowhit()"
then when the next object spawns, it repeats the process. Why does it trace the array.length as "1, 1, 2, 2, 3, 3, 4, 4, 5, 5, etc" until the despawn point and then goes on to display an error and then starts from 1 again, because if the array length is more than one object at the time when the first object of the array gets spliced away, shouldn't it go on as usual, since there are other objects in the array?
Thank you very much to whomever will read this through.

There are multiple problems:
1. You should add eventlisteners for your objects only once, but you add eventlisteners every time your timer runs to all of your snowflakes, again and again:
                              for (var i:Number = 0; i < nicesnowflakearray.length; i++){
                                        nicesnowflakearray[i].addEventListener(Event.ENTER_FRAME, snowhit);
change it to
nicesnowflake.addEventListener(Event.ENTER_FRAME, snowhit);
I don`t see why its even necessary to employ this snowflakearray, it would be much straight forward if you simply let the snowflakes take care of themselves.
2. Then you have to change your enterframe function accordingly
public function snowhit(event:Event) : void {
                              if (e.currentTarget.y >= 460){
                                        if (e.currentTarget.y == stage.stageHeight) {
                                        e.currentTarget.removeEventlistener(Event.ENTER_FRAME, snowhit);
                                        removeChild(e.currentTarget);
3.
                              //if (this.hitTestObject(nicesnowflake)){
                                        //trace("hit");
since "this" is a reference to the Main class (root) it surely won`t function as you intend it to.
                              if (false){
                                        super();
makes no sense to use a condition that can never be true

Java sorting the array of objects

Hi ,
I have a question on sorting objects in java.
I have a java interface some thing like :
public classmyObj extends Nullable
    private int objId;
    private Datemydate;
    public int getObjID();
    public Date getmyDate();
    public int getISecondD();
}I need to create the array of the objects of this class that are sorted on the ObjID:
classmyObj[] collectionObjects
I need to pass this collectionObjects to another function.
Now how should I sort these objects based on the ObjID on collection?
Please help with this!
Thanks

neeto wrote:
Hi ,
I have a question on sorting objects in java.
I have a java interface some thing like :You mean class?
>
public classmyObj extends Nullable
private int objId;
private Datemydate;
public int getObjID();
public Date getmyDate();
public int getISecondD();
}I need to create the array of the objects of this class that are sorted on the ObjID:
classmyObj[] collectionObjects
I need to pass this collectionObjects to another function.
Now how should I sort these objects based on the ObjID on collection?Create a comparator and use it in a call to Collections.sort (or Arrays.sort if you have an array)

Help sorting an array of objects needed please.

I am trying to sort the array Students[] in descending order of Fees due. Using the code below I get a null pointer error at runtime. The array is not completely full, it has 20 cells, but the variable studentArrayCounter holds the number of used cells. The 'getFeesDue()' code returns an integer value.
Any help is appreciated.
     // Sort Student Records Method
           public void sortStudentRecords()
            int loopCount = 0;
           for (loopCount = 1; loopCount < studentArrayCounter; loopCount ++)
          if(Students[loopCount].getFeesDue()>Students[loopCount-1].getFeesDue())
               SortStudents[0]=Students[loopCount-1];
               Students[loopCount-1]=Students[loopCount];
               Students[loopCount]=SortStudents[0];
     }

Also, unless the excersize is to write a sort algorigthm (which I kinda doubt) you should use Arrays.sort
Arrays.sort(Students, new Comparator() {
public int compare(Object o1, Object o2) {
    Student s1 = (Student) o1;
    Student s2 = (Student) o2;
    return s1.getFeesDue() - s2.getFeesDue();
});

Ref cursor to object and return to ref cursor

how i will call object type from refcursor and return value to ref cursor .

I need a help. please help me.
takes oracle object types as input/output.
PROCEDURE createserviceorder(
P_serviceorder IN serviceorder,
P_serviceid in out p_sm_type.serviceid,
P_serviceorderid out p_sm_type.serviceorderid,
Returnstatus out callstatus);
The serviceorder, callstatus are oracle object types.
The wrapper procedure for this API would be something like the example with pseudo code below
PROCEDURE createserviceorderwrapper(
P_serviceorder IN REFCURSOR,
P_serviceid in out p_sm_type.serviceid,
P_serviceorderid out p_sm_type.serviceorderid,
Returnstatus out REFCURSOR)
Map from ref cursor P_serviceorder to oracle object for serviceorder;
Map from other data types to local variables;
Call createserviceorder (pass the parameters here and get output.);
Map output callstatus to its equivalent REF CURSOR variable;
Return callstatus (and other out parameters if any )as REF CURSORS;
}

I have an Array of objects and want to add an ArrayList of a different ob

could someone please help me out with this one,
when the table is created i need create one new pile to each element of this array
create one new block for each pile
add a block to the pile
the block is an arraylist
the block and pile classes have already been set up
public class Table
private int NPILES; // the number of piles
private Pile[] piles; // the array of piles
/** Create a table and initialise the array piles.
* For every pile created create a block
public Table(int npiles)
// Initialise NPILES
NPILES = npiles;
// Create the array of size NPILES
piles = new Pile[NPILES];
for (int i = 0; i < NPILES; i++) {
/** Print the table. */
public void print()
System.out.println("");
System.out.println("P = Piles : B = Blocks");
System.out.println("");
System.out.println("P : B");
// Print the sequence of piles
for (int i = 0; i < NPILES; i++) {
System.out.println(i +":");
// Print pile i (as shown in the project specification
// ... to be completed
so it prints
Piles : Blocks
0 : 0
1 : 1
2 : 2
3 : 3
4 : 4
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Message was edited by:
JohnnyMac

where are the blocks to be added?
for (int i = 0; i < NPILES; i++) {Add the blocks here
for (int i = 0; i < NPILES; i++) {
System.out.println(i +":");
// Print pile i (as shown in the project
specification
// ... to be completed
}should have another loop inside the for-loop to print all values in the block at position i in the pile

Array of objects and polymophism

this is my code
    String title01 = "Jesus is between Us!!!";
    String ref01 = "JURYT354";
    double price01= 9.97;
    String author01 = "Sir Peter Johanais";
    Book item01 = new Book (title01, ref01, price01, author01);
     MediaItem[] sample = new MediaItem[10];
    sample[0] = item01;it compiles well until i add the last line, for some reason it wont compile after that. I cant find any error in the syntax so I need help.
this is the error message i get
    ']' expected sample[0] = item01;
                                         ^
     <identifier> expected    sample[0] = item01;
                                                                                 ^

I think you need to cast the Book object into
Media..... type object before assigning the value in
last line of codeNot if Book extends MediaItem (which im assuming it does.)

Sort array and return indexes

Hello,
Is there a java method that would sort an array of doubles and also return the original indexes of the array elements.
There is Array.sort(myArray), however the method does not give the original indexes.
Writing a code on sorting and getting the indexes does not sound attractive while java has effective methods to sort.
Thanks!

devboris wrote:
Can you ellaborate more on the code? I have not used a Comparator before.i think he/she means something like this, you can use the Comparator to sort the array post your attempt at sorting the array before asking for more help
public class TestArray {
    ArrayElement[] myArray = new ArrayElement[10];
    public void populateArray(){
        for(int i = 9;i>=0;i--){
            myArray[i] = new ArrayElement(i,9-i);
    public void sortArray(){
        //leave this to you
    public void printArray(){
        for(int i = 0;i<myArray.length;i++){
            System.out.println("Orig pos is "+myArray.getIndex()+" and value is "+myArray[i].getValue());
public static void main(String[] args){
TestArray test = new TestArray();
test.populateArray();
test.sortArray();
test.printArray();
}//end of class
class ArrayElement {
public int index;
public double value;
public ArrayElement(int i, double v){
this.index = i;
this.value = v;
public int getIndex(){
return this.index;
public double getValue(){
return this.value;
}//end of classHope this helps
Calypso

How to return array of object

public class A{
public class B{
publc C[] sample()
int i=0;
ResultSet rset = s.executeQuery("select name, id from emp ");
while(rs.next()){
name = rset.getString("nam");
id = rset.getInt("id");
c.setName(name )
c[i].setId(id)
return c[]
public class C{
// here i have getter and setter metod for name & id
When I try to return the object c[]..i am getting "cannot conver from C to C[]".
Can u pls help me, how to return array of object and how to get name and id values in other class using this array object
Thanks for ur help

public class Starting{
public long empID;
Data data = new Data();
Value[] value;
int count = 0;
     public static void executeDe(){
          value = new Value[100]
          try{
                 data.getDetails()
                 processDetails(value);
               }catch(Exception e){e.printStackTrace();}
     public static void processDetails(Value[] value){
     count = data.i;
          int i;
          for(i=0;i<count;i++){
              empID=value.getempID(); \\ here i am not getting all values..... am getting only last value of the array
public class Data{
public long empID;
public int i=0;
static Value[] value = new Value[100];
public static Value[] getDetails(){
Connection con=null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@" + hostname + ":1521:" + sid, user, password);
System.out.println(" conn " + con);
System.out.println("");
Statement s=con.createStatement();
try{
     ResultSet rset = s.executeQuery("select EMPID from Employee ");
     while(rset.next()){
empID = rset.getLong("EMPID");
value[i].setCycleID(cy_i);
i++;
     rset.close();
     con.close();
}catch (SQLException sqle){sqle.printStackTrace();}
     finally{
          try{
          s.close();
     con.close();
          }catch(SQLException e){e.printStackTrace();}
catch(Exception e){e.printStackTrace();}
return value;
     public class Value {
     public static long cycleID;
          public static void setempID(long empID) {
               Value.empID = empID;
          public static long getempID() {
               return empID;
This is my actual code..... I am able to set the values in Value class from Data class using getDetails() method, which is returning array of value object.
In Starting class, I am trying to get values using value[i].. i am getting last value of the array. This is my actual problem... here i want to get all values.
Please help me how to resolve this.

Creating an array of objects of a class known ONLY at RUNTIME

I have a method in a class which expects an array of objects of particular type (say A) as its only argument. I 'invoke' this method using reflection. I have the instances of the class A stored in a Vector. When I do 'toArray' on this vector, what I get back is an array of Objects and not an array of objects of A. I assign this array to the zeroth element of another Object array and pass that array as a second argument to the 'invoke' method. Of course, it throws an Exception saying - argument types mismatch. Because I am sending an array of Objects to a method expecting an array of objects of A. My problem is I don't know A until runtime. So I have to handle whatever I am getting back after doing 'toArray' on a vector as a Generic Object. I know there's another version of 'toArray' in the Vector class. But it's API documentation didn't help a lot.
Can anybody please help me solve this problem? Any sort of hints/code snippet would be of great help.
Does the above description makes any sense? If not, please let me know. I would try to illustrate it with a code sample.
Thanks a lot in advance.

Sorry, for the small typo. It is -
clazz[] arr = (clazz [])java.lang.reflect.Array.newInstance(clazz, n);
instead
Thanks for the reply. I could do this. But I am
getting a handle to the method to be 'invoke'd by
looking at the types of the parameters its
expecting(getParameterTypes). So I can't change it to
accept an array of Generic Objects.
I looked at the java.lang.reflect.Array class to do
this. This is what I am trying to do-
String variableName is an input coming into my
program.
n is the size of the array I'm trying to create.
Class clazz = Class.forName(variableName);
clazz[] arr = (clazz
[])java.lang.reflect.newInstance(clazz, n);
According to Reflection API, it should work, right?
But compiler yells at me saying 'class clazz not
found'.
Any suggestions/hints/help?
Thanks, again.

Sorting an array of objects and returning another variable

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