How can I use two conditions in Do While loop in Java

Question

do{
Scanner scan = new Scanner(System.in);
String value = scan.nextLine();
}while(!value.equals("example")/* need another condition here*/);

I want to put two(or more) conditions here, any one of them should be true to stop looping. Thanks for your help.

Have you heard of the boolean operators yet? If not, do google them. — Marko Topolnik, Jul 26 '15 at 10:45

score 3 · Accepted Answer · edited Jul 26 '15 at 11:22

3

Boolean operators

AND (&&)

p   q   p && q
T   T   T
T   F   F
F   T   F
F   F   F

OR (||)

p   q   p || q
T   T   T
T   F   T
F   T   T
F   F   F

So, to use it in your conditions.

if (x != 9 && x != 10) { ... }

if (x == 0 || x == 5) { ... }

edited Jul 26 '15 at 11:22

melpomene

answered Jul 26 '15 at 11:12

Uma Kanth

@melpomene Why have you changed the comparison operators? – Tom Jul 26 '15 at 11:28
1

@Tom I changed `x != 0 || x != 5` to `x == 0 || x == 5` because the former is always true (and is a somewhat common logic error that I didn't want to perpetuate in an example). – melpomene Jul 26 '15 at 11:32
Thanks Uma, It helped me :D – Shahbaz Talpur Jul 28 '15 at 08:33

score 2 · Answer 2 · answered Jul 26 '15 at 10:47

2

Have you tried using && or || between conditions? I'm new and I hope I'm not telling the obvious.

... while(!value.equals("example") && otherCondition || !found)...

answered Jul 26 '15 at 10:47

iSab

score 0 · Answer 3 · answered Jul 26 '15 at 11:30

The condtion s: cond1, cond2, cond3, .... condN.

"any one of them should be true" = (cond1==true && cond2==true && cond3==true && ... condN==true)

I your code it will be like: stop looping = ! before all the expresstion

do{

}while(!(cond1==true && cond2==true && cond3==true && ... condN==true));

score 0 · Answer 4 · answered Jul 26 '15 at 12:04

0

So if you want to stop the loop wenn either one of the statements is true or both of them are true, you need to use the boolean or operator "||".

If both of the statements should be true to stop the loop, you need to use boolena and operator "&&"

answered Jul 26 '15 at 12:04

insa_c

4 Answers4