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// This demonstrates code that will throw the // multiplicity exception class Program { title; 1 -- * Student; } class Student { name; public static void main(String[] argv) { Student s1 = null; Program p1 = null; // This will throw an exception since there must // be at least one program try { s1 = new Student("Abel", null); } catch (RuntimeException re) { System.out.println("Exception Caught: "+re+"\n"); } // After we create a program we can repeat the // attempt. p1 = new Program("Computer Science"); s1 = new Student("Abel", p1); // Attempting to change the program back to null // will not throw an exception but will result // in null being thrown if(!s1.setProgram(null)) { System.out.println("Could not set program "+ "to null as would violate multiplicity \n"); } } } //$?[End_of_model]$? // @@@skipcppcompile - Has Java code // @@@skipphpcompile - Has Java code // @@@skiprubycompile - Has Java code // @@@skippythoncompile - Has Java code
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