Java Basics - Loops 1

While Loops

While loops are continuous loops that repeat as long as a condition stays true.

For Example:

while(x<5){
//execute some code here
x++:
}


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For Loops

for(int i=1; i<5; i++)
{
//write code here
}

Section 1: Intialize loop counter at value;

Section 2:  The condition to continue looping

Section 3: What to to the loop counter every cycle

Now.

Lets run through the following for loop below

for(int i=1; i<=5; i++)
{
//run code here
}

i	Is i<=5?	Step into loop again?
1	1<=5 (true)	Yes
2	2<=5 (true)	Yes
3	3<=5 (true)	Yes
4	4<=5 (true)	Yes
5	5<=5 (true)	Yes
6	6<=5 (false)	No

Note we only increment at the end of the loop.

for(int i=1; i<=5; i++)
{
//run code here
//increment i by 1 here at the end of the loop here.
}
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Short notes on incrementing etc.

i=i-1  is the same as i--;
i=i+1 is the same as i++;
i=i+5 is the same as i +=5
i=i-6 is the same as i -=6
i=i*3 is the same as i*=3
i= i/2 is the same as  i/=2

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Ending the loop before it reaches its conditions

To do this we can use the word break;

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