java - Error trying to put dates on Xaxis in a line chart -

package org.gillius.jfxutils.examples;  import javafx.animation.animation; import javafx.animation.keyframe; import javafx.animation.timeline; import javafx.application.application; import javafx.event.actionevent; import javafx.event.eventhandler; import javafx.fxml.fxml; import javafx.fxml.fxmlloader; import javafx.scene.scene; import javafx.scene.chart.linechart; import javafx.scene.chart.xychart; import javafx.scene.control.label; import javafx.scene.control.slider; import javafx.scene.input.mousebutton; import javafx.scene.input.mouseevent; import javafx.scene.layout.region; import javafx.scene.layout.stackpane; import javafx.stage.stage; import javafx.util.duration; import org.gillius.jfxutils.jfxutil; import org.gillius.jfxutils.chart.chartpanmanager; import org.gillius.jfxutils.chart.fixedformattickformatter; import org.gillius.jfxutils.chart.jfxchartutil; import org.gillius.jfxutils.chart.stableticksaxis;  import java.text.simpledateformat; import java.util.timezone;  public class test extends application {     public static void main( string[] args ) {         launch( args );     }      @fxml     private linechart<number, number> chart;      @fxml     private slider valueslider;      @fxml     private label outputlabel;      private xychart.series<number, number> series;      private long starttime;      private timeline adddatatimeline;      @fxml     void addsample() {         series.getdata().add(new xychart.data(1, 23)); series.getdata().add(new xychart.data(2, 14));         series.getdata().add(new xychart.data(3, 15));         series.getdata().add(new xychart.data(4, 24));         series.getdata().add(new xychart.data(5, 34));         series.getdata().add(new xychart.data(6, 36));         series.getdata().add(new xychart.data(7, 22));         series.getdata().add(new xychart.data(8, 45));         series.getdata().add(new xychart.data(9, 43));         series.getdata().add(new xychart.data(10, 17));         series.getdata().add(new xychart.data(11, 29));         series.getdata().add(new xychart.data(12, 25));     } @fxml     void autozoom() {         chart.getxaxis().setautoranging( true );         chart.getyaxis().setautoranging( true );     }      @fxml     void toggleadd() {         switch ( adddatatimeline.getstatus() ) {             case paused:             case stopped:                 adddatatimeline.play();                 chart.getxaxis().setautoranging( true );                 chart.getyaxis().setautoranging( true );                 //animation looks horrible if we're updating lot                 chart.setanimated( false );                 chart.getxaxis().setanimated( false );                 chart.getyaxis().setanimated( false );                 break;             case running: adddatatimeline.stop();                 //return animation since we're not updating lot                 chart.setanimated( true );                 chart.getxaxis().setanimated( true );                 chart.getyaxis().setanimated( true );                 break;              default:                 throw new assertionerror( "unknown status" );         }     }      @override     public void start( stage stage ) throws exception {         fxmlloader loader = new fxmlloader( getclass().getresource( "charting.fxml" ) );         region contentrootregion = (region) loader.load();          stackpane root = jfxutil.createscalepane( contentrootregion, 960, 540, false );         scene scene = new scene( root, root.getprefwidth(), root.getprefheight() );         stage.setscene( scene );         stage.settitle( "charting example" );         stage.show(); }  @fxml     void initialize() {         starttime = system.currenttimemillis();          //set chart format dates on x axis //      simpledateformat format = new simpledateformat( "hh:mm:ss" ); //      format.settimezone( timezone.gettimezone( "gmt" ) ); //      ((stableticksaxis) chart.getxaxis()).setaxistickformatter( //              new fixedformattickformatter( format ) );          series = new xychart.series<number, number>();         series.setname( "data" );          chart.getdata().add( series );          adddatatimeline = new timeline( new keyframe(                 duration.millis( 250 ),                 new eventhandler<actionevent>() {                     @override                     public void handle( actionevent actionevent ) {                         addsample();                     }                 }         ));         adddatatimeline.setcyclecount( animation.indefinite );          chart.setonmousemoved( new eventhandler<mouseevent>() {             @override             public void handle( mouseevent mouseevent ) {                 double xstart = chart.getxaxis().getlocaltoparenttransform().gettx();                 double axisxrelativemouseposition = mouseevent.getx() - xstart;              }         } );  //panning works via either secondary (right) mouse or primary ctrl held down         chartpanmanager panner = new chartpanmanager( chart );         panner.setmousefilter( new eventhandler<mouseevent>() {             @override             public void handle( mouseevent mouseevent ) {                 if ( mouseevent.getbutton() == mousebutton.secondary ||                          ( mouseevent.getbutton() == mousebutton.primary &&                            mouseevent.isshortcutdown() ) ) {                     //let through                 } else {                     mouseevent.consume();                 }             }         } );         panner.start();          //zooming works via primary mouse button without ctrl held down         jfxchartutil.setupzooming( chart, new eventhandler<mouseevent>() {             @override             public void handle( mouseevent mouseevent ) {                 if ( mouseevent.getbutton() != mousebutton.primary ||                      mouseevent.isshortcutdown() )                     mouseevent.consume();             }         } );          jfxchartutil.adddoubleprimaryclickautorangehandler( chart );     } } 

this code line chart. working until try insert string on xaxis. want have chart strings on xaxis. got error: javafx.scene.chart.categoryaxis cannot cast javafx.scene.chart.valueaxis

the problem have chart defined linechart<number, number>.

to have chart string x-values , number y-values should set generic parameters as:

linechart<string, number> chart; 

and use categoryaxis:

a axis implementation works on string categories each value unique category(tick mark) along axis.

note: chart coming fxml file, have update fxml file also.

an example:

categoryaxis xaxis = new categoryaxis(); numberaxis yaxis = new numberaxis();         linechart<string,number> chart = new linechart<string,number>(xaxis,yaxis); 

furthermore, have update declaration , initialization of series also:

private xychart.series<string, number> series; ... series = new xychart.series<string, number>(); 

then can add data series as:

series.getdata().add(new xychart.data("somestring", 23)); 

you can check creating categories line chart section (example 3-4) of original tutorial.

update:

it found out jfxutils package used not supporting zomming in case of valueaxis. possible solution create zooming bar charts suggested in this answer.