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Declaring a variable and initialising it are two different things.

Declare
String s;

Initialise
s = "hello";

Declare and initialise
String s = "hello";

Oops! Misread your post.


char one = '1';
char two = 't';
System.out.println(Character.isDigit(one));
System.out.println(Character.isDigit(two));

Produces the exact output I expect: true...

I can't do what?

char currentChar = ...;

No need to use objects when it isn't necessary.

That error message is self explanatory, you did not give your variable an initial value.

String s;
if(5 == 19) {
s = "hello";
}
System.out.println(s);

In the above code what do you...