How to get midpoint of polyline in java arcobjects

Question

Here I want the midpoint of every polyline and add that point to List.

List<IPoint> pList = new ArrayList<IPoint>();
Polyline polyline = null;       
IPoint point = null;
for(int i=0;i<pFeatureLayerList.size();i++)
{
    IFeatureClass pFeatureClass = pFeatureLayerList.get(i).getFeatureClass();
    int numFeatures = pFeatureClass.featureCount(null);     
    if(pFeatureClass.getShapeType()==com.esri.arcgis.geometry.esriGeometryType.esriGeometryPolyline)
    {
        for(int j=0; j<numFeatures; j++)
        {
             IFeature pFeature = pFeatureClass.getFeature(j);
             polyline = (Polyline)pFeature.getShape();
             point = polyline.getCentroidEx();
             pList.add(point);
        }
    }
}

Answer 1

Try ICurve.QueryPoint with asRatio = true, and distanceAlongCurve = 0.5:

Copies to outPoint the properties of a point on the curve at a specified distance from the beginning of the curve.