Pre Java 8:
The closest Java has to delegates are single method interfaces. You could use an anonymous inner class.
interface StringFunc {
String func(String s);
}
void doSomething(StringFunc funk) {
System.out.println(funk.func("whatever"));
}
doSomething(new StringFunc() {
public String func(String s) {
return s + "asd";
}
});
doSomething(new StringFunc() {
public String func(String s) {
return new StringBuffer(s).reverse().toString();
}
});
Java 8 and above:
Java 8 adds lambda expressions to the language.
doSomething((t) -> t + "asd");
doSomething((t) -> new StringBuilder(t).reverse().toString());