What is a Question Mark and Colon Operator Used for

Question

Two questions about using a question mark     and colon     operator within the parentheses of a print function   What do they do  Also  does anyone know the standard term for them or where I can find more information on their use   I ve read that they are similar to an  if   else  statement   int row   10  int column  while  row  gt   1        column   1      while column  lt   10                System out print row   2    1     lt       r gt               column            --row      System out println

User · Answer

They are called the ternary operator since they are the only one in Java    The difference to the if   else construct is  that they return something  and this something can be anything      int k   a  gt  b   7   8     String s    foobar isEmpty        empty    foobar toString

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it is a ternary operator and in simple english it states  if row 2 is equal to 1 then return  lt  else return  r

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Maybe It can be perfect example for Android  For example   void setWaitScreen boolean set        findViewById R id screen main  setVisibility              set   View GONE   View VISIBLE       findViewById R id screen wait  setVisibility              set   View VISIBLE   View GONE

User · Answer

Thats an if else statement equilavent to  if row   2    1     System out print   lt      else    System out print   r gt

User · Answer

Also just though I d post the answer to another related question I had   a   x     y    Is equivalent to   a   x   x   y    If x is false or null then the value of y is taken

User · Answer

a 1  b 2   x 3  y 4   answer   a  gt  b   x   y    answer 4 since the condition is false it takes y value   A question mark       The value to use if the condition is true  A colon       The value to use if the condition is false

User · Answer

This is the ternary conditional operator  which can be used anywhere  not just the print statement  It s sometimes just called  quot the ternary operator quot   but it s not the only ternary operator  just the most common one  Here s a good example from Wikipedia demonstrating how it works   A traditional if-else construct in C  Java and JavaScript is written  if  a  gt  b        result   x    else       result   y     This can be rewritten as the following statement  result   a  gt  b   x   y    Basically it takes the form  boolean statement   true result   false result   So if the boolean statement is true  you get the first part  and if it s false you get the second one  Try these if that still doesn t make sense  System out println true    quot true  quot     quot false  quot    System out println false    quot true  quot     quot false  quot

[java] What is a Question Mark "?" and Colon ":" Operator Used for?

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