It is typically used when you need to call a Java method that is typed to take Object, and you want to pass it a numeric, string, or array value. You use MakeJavaObject to manually convert such arguments into Java objects before passing them to the method.
expr must be an integer or real number, a String, a boolean, or a list or matrix of numbers, strings, or booleans.
For an integer expr, the created Java object is of type java.lang.Integer.
For a real, the created Java object is of type java.lang.Double.
For a String, the created Java object is of type java.lang.String.
For a boolean, the created Java object is of type java.lang.Boolean.
For a list or matrix of numbers, strings, or booleans, the created object is a Java array of the corresponding primitive type. For example, MakeJavaObject[{1, 2, 3}] would create an int[] with these values.
