Java Nesting selection structures

[vaughtonUK08]

Hi all,

For a piece of college work i have been as to nest a selection structure within another selction structure. Ive been serching google with no avail. if anyone could shed any light on this it would be amazing

Cheers

Dave

 

[RobH]

A "selection" structure is a fancy name for an "if" statement which often confuses people so a nested selection structure would be a set of nested "if" statements.

 

[vaughtonUK08]

Cheers Rob very usefull dont suppose a iteration control structure would be in simple terms?

Thanks Again
Dave

 

[RobH]

I'm guessing an interation control structure would be refering to a "for" or "foreach" loop (a foreach loop is also known as an enhanced for loop in Java). Again these sounds like terms that someone might ask me about in a job interview, no one in the real world refers to these constructs by these names, well at least anyone I know of.

 

[vaughtonUK08]

thanks again, my uni lecturer is a bit like that, think it makes him feel important if he uses words we wont understand.

Thanks for your promt help!
Dave

 

[Dj_Jestar]

I hate pompous terminology.

 

[vaughtonUK08]

Hey guys being a bit ofa noob here doing this java script cource work.
I know its a big ask but if i wanted to have a for loop with a 'if' selection nested withing it how would they be linked together? bit cheecky i know but if anyone one has five min to write me a v simple layout id be so happy

Dave

 

[Dj_Jestar]

if (something) {
  if (somethingElse) {
  }
}

 

[Yeggstry]

in psuedo code:

for each object in the array...
if the object.property is equal to "blah"
do this
else
do that

any simple java book should give you an example of this, I'm not writing it with the correct syntax for you

 

[Inquisitor]

Basically, when you have a loop (any kind; for or while), everything inside that loop is executed on each iteration, so the if clause will be evaluated each time it iterates over the loop.

For example:

for (int i = 0; i < 5; i++)
{
    if (something)
    {
        // Do some stuff.
    }
}

…is equivalent to this:

// First iteration.
if (something)
{
    // Do some stuff.
}

// Second iteration.
if (something)
{
    // Do some stuff.
}

// Third iteration.
if (something)
{
    // Do some stuff.
}

// Fourth iteration.
if (something)
{
    // Do some stuff.
}

// Fifth iteration.
if (something)
{
    // Do some stuff.
}

 

[Una]

Hey guys being a bit ofa noob here doing this java script cource work.
I know its a big ask but if i wanted to have a for loop with a 'if' selection nested withing it how would they be linked together? bit cheecky i know but if anyone one has five min to write me a v simple layout id be so happy

Dave

for (initialiser; test expression; post statement) {
  if (something) {
    // Do something 
  } 
}

 

[Visage]

<snip>

Being pedantic, its actually equivalent to this:

int i = 0 ;
// First iteration.
if (something)
{
    // Do some stuff.
}

i++ ;
// Second iteration.
if (something)
{
    // Do some stuff.
}

i++ ;
// Third iteration.
if (something)
{
    // Do some stuff.
}

i++ ;
// Fourth iteration.
if (something)
{
    // Do some stuff.
}

i++ ;
// Fifth iteration.
if (something)
{
    // Do some stuff.
}

Im a bit OCD about things like that....

 

[Inquisitor]

Being pedantic, its actually equivalent to this:

<snip>

Im a bit OCD about things like that....

I did think that and knew someone would come along and correct me

 

[RobH]

Hey guys being a bit ofa noob here doing this java script cource work.

So are you using Java or Javascript, there completely different languages?

 

[vaughtonUK08]

'javascript' i did say was a noob

 

[RobH]

Well it just clears it up as you said Java in the thread title, the example people have posted have been Java.