Code to Merge Visio Files in Java. For more details: https://kb.conholdate.com/total/java/how-to-merge-visio-files-in-java/

how-to-merge-visio-files-in-java.java

import com.aspose.diagram.License;

public class AsposeTest {

	public static void main(String[] args) throws Exception {//Main function to combine Visio diagram using Java 

        // Instantiate the license
        License lic = new License(); 
        lic.setLicense("Aspose.Total.lic");

    	// Load destination Visio diagram
    	com.aspose.diagram.Diagram diagramDest = new com.aspose.diagram.Diagram("Input.vsdx");

    	// Load source Visio diagram
    	com.aspose.diagram.Diagram diagramSource = new com.aspose.diagram.Diagram("Input.vsdx");

    	// Merge Visio diagrams
    	diagramDest.combine(diagramSource);

    	// Save output Visio diagram
    	diagramDest.save("Merged.vsdx" , com.aspose.diagram.SaveFileFormat.VSDX);

        System.out.println("Done");
	}
}