# KnownLengthArray

vtk-examples/Java/Utilities/KnownLengthArray

### Description¶

This example creates a VTK style float array. This can be easily interchanged with vtkIntArray, vtkDoubleArray, etc.

The terminology is as follows:

• SetNumberOfComponents(): sets the number of elements that a tuple in the array will have. See VectorArrayKnownLength for an example with tuples with more than one element.

• SetNumberOfValues(): sets the number of tuples the array will have. See UnknownLengthArray for an example where the number of values is not known in advance.

Other languages

See (Cxx)

Question

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### Code¶

KnownLengthArray.java

import vtk.vtkNativeLibrary;
import vtk.vtkFloatArray;

public class KnownLengthArray
{
//-----------------------------------------------------------------
// Load VTK library and print which library was not properly loaded
static
{
{
for (vtkNativeLibrary lib : vtkNativeLibrary.values())
{
{
System.out.println(lib.GetLibraryName() + " not loaded");
}
}
}
vtkNativeLibrary.DisableOutputWindow(null);
}
//-----------------------------------------------------------------
public static void main(String s[])
{
vtkFloatArray Distances = new vtkFloatArray();
Distances.SetName("Distances");
Distances.SetNumberOfComponents(1);
Distances.SetNumberOfValues(5);

//set values
for(int i = 0; i < Distances.GetNumberOfTuples(); i++)
{
double f = i + 0.1;
Distances.SetValue(i, f);
}

//get values
for(int i = 0; i < Distances.GetNumberOfTuples(); i++)
{
double f = Distances.GetValue(i);
System.out.println(f);
}

}
}