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- public class FunctionPointerDemo {
- public static void main(String[] args) {
- // bigger than implementation
- FunctionPointer fp = new FunctionPointer() {
- public String function(int a, int b) {
- if (a > b)
- return "bigger";
- else
- return "not bigger";
- }
- };
- comparison(1, 2, fp);
- comparison(3, 2, fp);
- // smaller than implementation
- FunctionPointer fp2 = new FunctionPointer() {
- public String function(int a, int b) {
- if (a < b)
- return "smaller";
- else
- return "not smaller";
- }
- };
- comparison(1, 2, fp2);
- comparison(3, 2, fp2);
- }
- // prototype
- interface FunctionPointer {
- public String function(int a, int b);
- }
- // function with fp class as argument
- public static void comparison(int a, int b, FunctionPointer fp) {
- System.out.printf("%d is %12s than %d\n", a, fp.function(a, b), b);
- }
- }
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