Java for Fucking Idiots: Learn the Basics of Java Programming Without any experience!

boolean
isPositive(
int
number) {
if
(number >
0
) {
return true
;
}
}
What if the number is less than or equal to 0? You need to explicitly give
your method something to return in all scenarios! Java isn’t smart enough to
infer that anything else would be false , for example.
You’d have to do something like this:
boolean
isPositive(
int
number) {
if
(number >
0
) {
return true
;
}
else
{
return false
;
}
}
Or, you could provide a “catch-all” return value at the bottom of your
method, which in this example acts the same way:
boolean
isPositive(
int
number) {
if
(number >
0
) {
return true
;
}
return false
;
}
Static methods

---

Typically, you call methods on objects . The idea is that the methods will
interact with the properties on that object; change the value, retrieve the
value, initialize a value, all that shit.
But you can create methods that don’t need to be called on an object. Just
the class. Those methods are static .
Here’s a few examples
class
StringHelpers {
public static boolean
startsWithA(String str) {
return
str.charAt(
0
) ==
'A'
;
}
public static boolean
isNullOrEmpty(String str) {
return
str ==
null
|| str.isEmpty();
}
}
We don’t need to create a 
new StringHelpers()
object, then use a dot “.” to
call the method on that object. We can straight up just use the StringHelpers
class itself.
String myString =