java code formats

Question

I'm really sorry for what must be a really stupid question. I don't exactly have formal training in java and a lot of times, when looking through code, I might see something like:

(  ) ?   :

as in something like:

for (str == null) ? getString(this) : dontGetit(nope.this);

honestly i don't even know exactly it is or if it's remotely close, but hopefully one could recognize the scheme. I was hoping one could perhaps link some documentation on this because i have trouble even searching for it.

Juvanis · Accepted Answer · 2012-11-17 21:42:46Z

2

It is ternary operator in Java. Read here : http://www.janeg.ca/scjp/oper/ternary.html

answered Nov 17, 2012 at 21:42

Juvanis

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PermGenError · Accepted Answer · 2012-11-17 22:03:04Z

2

it an ternary operator used to evaluate boolean expressions. It is equivalent to if-else statement.

Syntax:

   variable_name= (boolean expression) ? value to assign if true : value to assign if false

using terenary operator:

    boolean isHappy = true;
    String mood = (isHappy == true)?"I'm Happy!":"I'm Sad!";

using if-else:

 if(isHappy) {
     mood="I'm Happy";
  }
  else {
     mood = "I'm, Sad!";
   }

edited Nov 17, 2012 at 22:03

answered Nov 17, 2012 at 21:43

PermGenError

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Jericho · Accepted Answer · 2012-11-17 21:42:21Z

1

this is conditional or ternary operator in java

( a ) ? b  : c;

if a is true b will be executed or run

if a is false c will be executed or run

answered Nov 17, 2012 at 21:42

Jericho

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Community · Accepted Answer · 2017-05-23 11:43:09Z

1

It's the ternary operator . It's good in sets, and a shortcut for iteration

java ternary operator

Here's an easy ex.:

boolean isObese = true;

 String mood = (isObese == true)?"I need to quit fast-food!":"I'm healthy!";

..source

edited May 23, 2017 at 11:43

CommunityBot

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answered Nov 17, 2012 at 21:42

Caffeinated

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dimitrisli · Accepted Answer · 2012-11-17 21:52:09Z

1

It's called ternary operator, it can be allocated to a variable and it is equivalent of an if-then-else statement.

Have a look at this tutorial and pay attention on something that hasn't been underlined enough by the other answers: the fact that the ternary operator is an expression that can be allocated to a variable or can be returned directly by a method. It has a functional feel into it.

edited Nov 17, 2012 at 21:52

answered Nov 17, 2012 at 21:43

dimitrisli

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