Calling a Java method that returns an Object

This example demonstrates calling a Java method that returns an Object.

model MosJvmExample2
  uses "mosjvm"

  declarations
    o: jvmobject
  end-declarations

  writeln("Creating file")
  o := jvmcallobj("com.fico.examples.FileOperations.createFile")
  if jvmstatus=false then
    setmatherr("Java exception: "+jvmgetexceptionclass)
  end-if
	
  writeln("Deleting file")
  jvmcallvoid("com.fico.examples.FileOperations.deleteFile", o)
  if jvmstatus=false then
    setmatherr("Java exception: "+jvmgetexceptionclass)
  end-if

end-model

Where the FileOperations class is defined as follows:

package com.fico.examples;
import java.io.*;

public class FileOperations {
  public static File createFile() throws IOException {
    File f = (new File("testfile.txt")).getAbsoluteFile();
    try (PrintWriter pw = new PrintWriter(new FileWriter(f))) {
      pw.println("Hello World");
    }
    return f;
  }
  public static void deleteFile(File f) throws IOException {
    if (!f.delete()) throw new IOException("Failed to delete file: "+f);
  }
}