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+// This example illustrates the manipulation of C++ references in Java.
+
+public class runme {
+ static {
+ try {
+ System.loadLibrary("example");
+ } catch (UnsatisfiedLinkError e) {
+ System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+ System.exit(1);
+ }
+ }
+
+ public static void main(String argv[])
+ {
+ System.out.println( "Creating some objects:" );
+ Vector a = new Vector(3,4,5);
+ Vector b = new Vector(10,11,12);
+
+ System.out.println( " Created " + a.print() );
+ System.out.println( " Created " + b.print() );
+
+ // ----- Call an overloaded operator -----
+
+ // This calls the wrapper we placed around
+ //
+ // operator+(const Vector &a, const Vector &)
+ //
+ // It returns a new allocated object.
+
+ System.out.println( "Adding a+b" );
+ Vector c = example.addv(a,b);
+ System.out.println( " a+b = " + c.print() );
+
+ // Note: Unless we free the result, a memory leak will occur if the -noproxy commandline
+ // is used as the proxy classes define finalizers which call the delete() method. When
+ // -noproxy is not specified the memory management is controlled by the garbage collector.
+ // You can still call delete(). It will free the c++ memory immediately, but not the
+ // Java memory! You then must be careful not to call any member functions as it will
+ // use a NULL c pointer on the underlying c++ object. We set the Java object to null
+ // which will then throw a Java exception should we attempt to use it again.
+ c.delete();
+ c = null;
+
+ // ----- Create a vector array -----
+
+ System.out.println( "Creating an array of vectors" );
+ VectorArray va = new VectorArray(10);
+ System.out.println( " va = " + va.toString() );
+
+ // ----- Set some values in the array -----
+
+ // These operators copy the value of Vector a and Vector b to the vector array
+ va.set(0,a);
+ va.set(1,b);
+
+ // This works, but it would cause a memory leak if -noproxy was used!
+
+ va.set(2,example.addv(a,b));
+
+
+ // Get some values from the array
+
+ System.out.println( "Getting some array values" );
+ for (int i=0; i<5; i++)
+ System.out.println( " va(" + i + ") = " + va.get(i).print() );
+
+ // Watch under resource meter to check on this
+ System.out.println( "Making sure we don't leak memory." );
+ for (int i=0; i<1000000; i++)
+ c = va.get(i%10);
+
+ // ----- Clean up -----
+ // This could be omitted. The garbage collector would then clean up for us.
+ System.out.println( "Cleaning up" );
+ va.delete();
+ a.delete();
+ b.delete();
+ }
+}