7. Nested Classes and Interfaces
| 7.1 |
// Filename: Exercise3.java interface Function { public int evaluate(int arg); } class Half implements Function { public int evaluate(int arg) { return arg/2; } } class Print implements Function { public int evaluate(int arg) { System.out.println(arg); return arg; } } public class Exercise3 { /* Inner class that applies the function, prints the value, and returns the result. */ static class PrintFunc extends Print { PrintFunc(Function f) { func = f; } Function func; public int evaluate(int arg) { return super.evaluate(func.evaluate(arg)); } } // Inner class that just returns the argument unchanged. /* Use this when you want a PrintFunc object to print the argument as-is. */ static class NoOpFunc implements ... |
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