return
statements at the end of methods with a non-void return type.
The end of method should be reachable by the method's execution flow.
Example:
String foo(int a) {
if (a > 0) {
return "more than zero"
}
} // foo(-1) will return 'null'
int bar(int a) {
if (a > 0) {
return a
}
} // bar(-1) will fall with runtime exception