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