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Getting the Possible Values for a Print Job Capability

import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.OutputStream; import java.lang.reflect.Array; import javax.print.DocFlavor; import javax.print.StreamPrintService; import javax.print.StreamPrintServiceFactory; import javax.print.attribute.standard.OrientationRequested; public class Main {   public static void main(String[] argv) throws Exception {     OutputStream fos = new BufferedOutputStream(new FileOutputStream("filename.ps"));     DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;     StreamPrintServiceFactory[] factories = StreamPrintServiceFactory         .lookupStreamPrintServiceFactories(flavor, DocFlavor.BYTE_ARRAY.POSTSCRIPT.getMimeType());     StreamPrintService service = factories[0].getPrintService(fos);     Class category = OrientationRequested.class;     Object o = service.getSupportedAttributeValues(category, null, null);     if (o == null) {       System.out.println("Attribute is not supported");     } else if (o.getClass() == category) {       System.out.println("irrelevant");     } else if (o.getClass().isArray()) {       System.out.println("array");        for (int i = 0; i < Array.getLength(o); i++) {         Object v = Array.get(o, i);         System.out.println(v);       }     }    } }