How can we pass a function as a parameter in java

Question

Is it possible to do so?

Answer 1

You can probably use the below code:

public T myMethod(Callable<T> func) 

{
    return func.call();
}

Answer 2

Java 8 and above

Using Java 8+ lambda expressions, if you have a class or interface with only a single method, for example:

public interface MyInterface {
    String doSomething(int param1, String param2);
}

then anywhere where MyInterface is used, you can substitute a lambda expression:

class MyClass {
    public MyInterface myInterface = (p1, p2) -> { return p2 + p1; };
}