Which is the Best way to exit a method

问题

I was looking for the ways to exit a method, i found two methods System.exit(); Return;

System.exit() - Exits the full program Return exits current method and returns an error that remaining code are unreachable.

class myclass
{
    public static void myfunc()
    {
        return;
        System.out.println("Function ");
    }
}

public class method_test
{
    public static void main(String args[])
    {
        myclass mc= new myclass();
        mc.myfunc();
        System.out.println("Main");
    }
}

回答1:

There is no best way, it depends on situation.

Ideally, there is no need to exit at all, it will just return.

int a() {
    return 2;
}

If there is a real need to exit, use return, there are no penalties for doing so.

void insertElementIntoStructure(Element e, Structure s) {
    if (s.contains(e)) {
        return; // redundant work;
    }
    insert(s, e); // insert the element
}

this is best avoided as much as possible as this is impossible to test for failure in voids

Avoid system.exit in functions, it is a major side effect that should be left to be used only in main.

void not_a_nice_function() {
    if (errorDetected()) {
        System.exit(-1);
    }
    print("hello, world!");
}

this pseudocode is evil because if you try to reuse this code, it will be hard to find what made it exit prematurely.

回答2:

The best and proper way to exit from method is adding return statement.

System.exit() will shutdown your programm.

if you use system.exit once a thread goes there, it won't come back.

system.exit is part of Design of the Shutdown Hooks API

回答3:

first of all your code will kill good programmers imagine this code Which is the Best way to exit a method this code example that how a return comes before a System.out.print(); as it becomes unreachable after the return statement lols the command

         System.exit(int status); (status=0 for Normal Exit && status=-1 for abnormal exit

is only used if you want to exactly quit your whole app whereas the command

         return;

is used to get out/return from a method these two are different in their operations

来源：https://stackoverflow.com/questions/16255267/which-is-the-best-way-to-exit-a-method

标签

java

methods

exit