If statement with semicolon

[naniigadu pokiri]

boolean foo = true;
if (foo);
{
print("hello")
}
if(!foo);
{
print("goodbye");
}

The above program printing both hello and goodbye.
Can anyone explain whats going on here and what is the use of if();

[Tom Reilly]

The semicolon ends the if statement. So the next statement is the print("hello") or print("goodbye"); To see this, try changing the line if(!foo); to else (to create an if-else statement).

[Harikrishna Gorrepati]

You stated and ended condition by saying

if (foo); After that you have a block of code

{ 
print("hello") 
}

Again, you started and closed condition by saying
if(!foo); After that you have a block of code

{ 
print("goodbye"); 
} 

Here is program from my eclipse

public class MyTest {
    public static void main(String[] args) {
	boolean foo = true; 
	if (foo); 
	{ 
	    System.out.println("hello") ;//Always "hello" prints because there is semicoln after if (foo)
	} 
	if(!foo); 
	{ 
	    System.out.println("goodbye");//Always "goodbye" prints because there is semicoln after if(!foo);
	} 
    }
}

From opening to closing braces, It is a block of code. (Code block)

[naniigadu pokiri]

thanks for your responses Hari and tom, but what is the use of it, if it always print the statements below to it.

[Bear Bibeault]

It's not useful. Don't do it.

[Harikrishna Gorrepati]

naniigadu pokiri wrote:thanks for your responses Hari and tom, but what is the use of it, if it always print the statements below to it.

The general rule is semicolon(;) completes the statement. you started if loop and closed it by using semicolon..These is no special use together (i.e., condition and semicolon)(if(true);)

[Abimaran Kugathasan]

naniigadu pokiri wrote:thanks for your responses Hari and tom, but what is the use of it, if it always print the statements below to it.

There is no relation between the if statement and the followed code block. Both are different! have a look here~!

public class TestColon	{
	public static void main(String[] args)	{
		boolean foo = true;
		//if(foo);
		{
			System.out.println("A");
		}
		//if(!foo);
		{
			System.out.println("B");
		}
	}
}

[Trivikram Kamat]

naniigadu pokiri wrote:
but what is the use of it, if it always print the statements below to it.

There's no use of it as such.
It's given in the question just to find out whether one has understood conditional statements in Java.

[naniigadu pokiri]

Thanks all for your responses..