Question

I am searching for the difference between recursion and iteration in java. Please include a Java code example of both.

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Answer 1

Recursion happens when a method or function calls itself on a subset of its original argument. For example, MergeSort – it splits the array into two halves and calls itself on these two halves.

Recursion would look like this, but it is a very artificial example that works similarly to the iteration example below:

public void doSomething(int i) {
    // code
    if (i == 10) {
        return;
    } else {
        doSomething(i + 1);
    }
}

Iteration is one pass of a cycle or loop. For example, code in this loop:

for(int i = 0; i < 10; i++){
    //code
}

will be executed 10 times, i.e. have 10 iterations.