J48 toSource problem

I want to read the J48 model intto if-else structure using toSource
method. Can you check if there is any problem with my code? it prints
out the tree several times besides the if-else code.
         J48 cls2 = (J48) weka.core.SerializationHelper.read("test_data/j48.model");
         String x =cls2.toString();
         String x2 =cls2.toSource(x);
         System.out.print(x2);

Thanks!

Henry

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