Can a similar functionality be achieved in Java?
function sum(num1, num2, onComplete)
{
var result = num1 + num2;
onComplete(result);
}
(function(){
sum(3, 5, function(res){alert(res)});
})()
Is it possible to implement this in Java without worrying about the specific version?
To implement the Command pattern in Java 6 or 7, you can follow these steps:
public interface Command<T> {
public void execute(T t);
}
Next, you can create a method like this:
public void calculateSum(int num1, int num2, Command<Integer> onComplete) {
int result = num1 + num2;
onComplete.execute(result);
}
Here is an example of how you can use this method:
someObj.calculateSum(1, 2, new Command<Integer>() {
public void execute(Integer result) {
System.out.println("The sum is: " + result);
}
});
Utilizing Lambdas in Java 8 allows for a more concise way of achieving this task, unlike in previous iterations where a class or interface would need to be passed containing the desired function.
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