iterator output not in sync

run_g · 2014-07-03T21:17:07

my iterator output (below) is picking up diagonals of vector3D array, why? how can i fix this code so the output is the same as the 2-d array output (below also)? Or is it a fact that iterators cannot be used with 2d arrays many thanks (just edited to add some comments now. Hope that helps) public class myIterator{ List<vector3D> vec = new ArrayList<vector3D>(); vector3D myTwoDimVec[][] = new vector3D[3][5]; myIterator( ){ for(int i=0; i<myTwoDimVec.length; i++){ //double loop to traverse 2d vector array for(int j=0; j<myTwoDimVec[i].length; j++){ //setting values the x,y,z data feild of the vector3D // in order to make each data unique value and thus debugging is tractable // i am incrementing the data by 1 using i * myTwoDimVec[i].length + j // this is row* MaxColumnLength + current column // in other words if i do not increase by 1 at all then it will be //myTwoDimVec[i][j] = new vector3D(10, 20, 30 ); and all the data will look the same //but this code makes it 10, 20, 30 11, 21, 31 12, 22, 32 etc // so with this difference i can track which data went missing myTwoDimVec[i][j] = new vector3D(10+(i*myTwoDimVec[i].length+j), 20+(i*myTwoDimVec[i].length+j), 30+(i*myTwoDimVec[i].length+j)); vec.add( myTwoDimVec[i][j] ); // adding to the arraylist } } } public void createListVector3D(){ for(int i=0; i<myTwoDimVec.length; i++){ //double loop to print out the for(int j=0; j<myTwoDimVec[i].length; j++){// data directly- not using *.hasNext System.out.println("2 dimen array output "+myTwoDimVec[i][j].x + " " + myTwoDimVec[i][j].y + " " + myTwoDimVec[i][j].z ); } } ListIterator<vector3D> vecIterator = vec.listIterator(); System.out.println( "============================================================="); while( vecIterator.hasNext()){ // outputing using hasNext System.out.println( "iterator list output " + vecIterator.next().x + " " + vecIterator.next().y + " " + vecIterator.next().z ); } } } public class conceptPractice { static myIterator scanArray; public static void main( String[] args ){ scanArray = new myIterator(); scanArray.createListVector3D(); } } 2 dimen array output 10.0 20.0 30.0 2 dimen array output 11.0 21.0 31.0 2 dimen array output 12.0 22.0 32.0 2 dimen array output 13.0 23.0 33.0 2 dimen array output 14.0 24.0 34.0 2 dimen array output 15.0 25.0 35.0 2 dimen array output 16.0 26.0 36.0 2 dimen array output 17.0 27.0 37.0 2 dimen array output 18.0 28.0 38.0 2 dimen array output 19.0 29.0 39.0 2 dimen array output 20.0 30.0 40.0 2 dimen array output 21.0 31.0 41.0 2 dimen array output 22.0 32.0 42.0 2 dimen array output 23.0 33.0 43.0 2 dimen array output 24.0 34.0 44.0 ============================================================= iterator list output 10.0 21.0 32.0 iterator list output 13.0 24.0 35.0 iterator list output 16.0 27.0 38.0 iterator list output 19.0 30.0 41.0 iterator list output 22.0 33.0 44.0

For Beginners

Started by run_g July 01, 2014 11:20 PM

20 comments, last by rip-off 9 years, 9 months ago

run_g

212

Author

July 03, 2014 07:43 PM

I do apologise

Wooh, rip-off, DeafManNoEars, BitMaster, Lasctose et al

It did work with the correct behaviour with Wooh exact code

I dont know what mistakes i made originally that caused the errors that i observed the first times i tried it, I must overwritten some other code

My apologies and many thanks

rip-off

11,000

July 03, 2014 09:17 PM

Glad it is working for you now. Just to point out that this is why I was urging you to post the actual, full code that you thought you had corrected that still wasn't working. There was probably some minor mistake in your initial attempt that we may have caught earlier.

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iterator output not in sync

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