Flow Control - Java Programming Questions and Answers

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Discussion :: Flow Control

public void foo( boolean a, boolean b) 
{     
 if( a )     
 {       
     System.out.println("A"); /* Line 5 */    
 }    
 else if(a && b) /* Line 7 */    
 {      
     System.out.println( "A && B");  
 }    
 else /* Line 11 */  
 {       
   if ( !b )        
   {           
        System.out.println( "notB") ;     
    }          
    else         
    {             
        System.out.println( "ELSE" ) ;      
    }      
   } 
 }

If a is true and b is true then the output is "A && B"

If a is true and b is false then the output is "notB"

If a is false and b is true then the output is "ELSE"

If a is false and b is false then the output is "ELSE"

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Answer : Option C

Explanation :

Option C is correct. The output is "ELSE". Only when a is false do the output lines after 11 get some chance of executing.

Option A is wrong. The output is "A". When a is true, irrespective of the value of b, only the line 5 output will be executed. The condition at line 7 will never be evaluated (when a is true it will always be trapped by the line 12 condition) therefore the output will never be "A && B".

Option B is wrong. The output is "A". When a is true, irrespective of the value of b, only the line 5 output will be executed.