Why does this return true?
String b = "(5, 5)";
String a = "(7, 8)" ;
if(a.equals(b));
{
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
Output:
Somehow "(7, 8)" and "(5, 5)" are the same
-
Why do java if statement fail when it ends in semicolon?Bernhard Barker– Bernhard Barker2014-02-10 07:34:52 +00:00Commented Feb 10, 2014 at 7:34
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5 Answers
Your code is equivalent to:
if(a.equals(b)) { }
{
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
So the print statement in a block that'll be always executed regardless of the condition, since the body of the if doesn't include that statement.
See the JLS - 14.6. The Empty Statement:
An empty statement does nothing.
EmptyStatement:
;Execution of an empty statement always completes normally
5 Comments
Suresh Atta
Ahh.. language specification.
Grijesh Chauhan
I was about to post this link!! Edit: @sᴜʀᴇsʜᴀᴛᴛᴀ Read this stackoverflow.com/a/14112532/1673391
Maroun
Fast and furious......
Suresh Atta
@GrijeshChauhan That's an useful link.
Maroun
He went to future in time and stole my link.
You have ; after your if statement.
use:
if(a.equals(b)) {
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
Take a look at this answer.
1 Comment
Bernhard Barker
It might be helpful to also explain what happens when you put the semi-colon there.
if(a.equals(b));<-----
You have an extre ; there and statements ends there.
That's like writing
if(a.equals(b));
and a block here
{
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
So get rid of that extra ;
4 Comments
Rahul
a static block here - It is not a static block, AFAIK.
Suresh Atta
@Ɍ.Ɉ So what you think of it ?? Can you please correct me ?
Rahul
It is an anonymous block. This is a static block -
static { ... }.Suresh Atta
@Ɍ.Ɉ I usually refer them static's :). There is a good reason to change it. Thanks.
Your if condition satisfied, but nothing will execute since ; in following.
if(a.equals(b)); // ; this is equal to if(a.equals(b)){}
Correct this as follows
if(a.equals(b)){
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
answered Feb 10, 2014 at 7:29
Ruchira Gayan Ranaweera
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Comments
Because you typed a ; after the if statement. Then it will be evaluated as if(a.equals(b)){};, which means do nothing.
String b = "(5, 5)";
String a = "(7, 8)" ;
if(a.equals(b)); <-- remove this ';'
{
System.out.printf("Somehow \"%s\" and \"%s\" are the same" ,a,b);
}
Comments
