One geometry is within another if it is a subset of the other geometry and their interiors have at least one point in common. Within is the inverse of Contains.
In the following pictures Geometry A is blue, and Geometry B is red.
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Example 1: Is Geometry A within Geometry B?
static boolean geometryIsWithin(Geometry geometryA, Geometry geometryB, SpatialReference sr)
{
boolean isWithin = OperatorWithin.local().execute(geometryA, geometryB, sr, null);
return isWithin;
}