What does the return keyword do in a void method in Java?

Question

I\'m looking at a path finding tutorial and I noticed a return statement inside a void method (class PathTest, line 126):

Answer 1

It just exits the method at that point. Once return is executed, the rest of the code won't be executed.

eg.

public void test(int n) {
    if (n == 1) {
        return; 
    }
    else if (n == 2) {
        doStuff();
        return;
    }
    doOtherStuff();
}

Note that the compiler is smart enough to tell you some code cannot be reached:

if (n == 3) {
    return;
    youWillGetAnError(); //compiler error here
}

Answer 2

The keyword simply pops a frame from the call stack returning the control to the line following the function call.

Answer 3

The Java language specification says you can have return with no expression if your method returns void.

Answer 4

See this example, you want to add to the list conditionally. Without the word "return", all ifs will be executed and add to the ArrayList!

    Arraylist<String> list =  new ArrayList<>();

    public void addingToTheList() {

    if(isSunday()) {
        list.add("Pray today")
        return;
    }

    if(isMonday()) {
        list.add("Work today"
        return;
    }

    if(isTuesday()) {
        list.add("Tr today")
        return;
    }
}

Answer 5

It functions the same as a return for function with a specified parameter, except it returns nothing, as there is nothing to return and control is passed back to the calling method.

Answer 6

It exits the function and returns nothing.

Something like return 1; would be incorrect since it returns integer 1.