Can a for loop be written to create an infinite loop or is it only while loops that do that?

Question

Can a for loop be written in Java to create an infinite loop or is it only while loops that cause that problem?

Answer 1

Sure you can

for(int i = 0; i == i; i++) {}

Any loop can be made infinite as long as you make a way to never hit the exit conditions.

Answer 2

Just for fun (and this too long for a comment): a lot of people will be very surprised to learn that for a lot of very practical purposes the following is nearly an infinite loop:

    for (long i = Long.MIN_VALUE; i < Long.MAX_VALUE; i++) {
        ...
    }

If the thread executing this loops can do 4 billions cycles per second and can do the increment and the check in one cycle (quite beefy for a single thread) and if my maths ain't totally off, I think the above code needs about 150 years to execute : )

Answer 3

The way I made my server to run as long until I shut it down is

for(int i = 0;i<-1;i++){//code here}

Answer 4

There's lots of ways to make for loops infinite. This is the solution I found:

int j = 1;
for (int i = 0; i < j; i++) {
  //insert code here
  j++;
}

This works really well for me because it allows the loop to check an infinite amount of values as well as looping infinitely.

Answer 5

There is also this one, to complete the topic:

do {something();} while(true);

Answer 6

you can declare a subpart of the code to be another part in a for loop, example -

public class (classname) {
    for(int i = 1; i <= 4; i++) {
        for(int j = 1; i <= 4; j++) {
    system.out.println(i + "*" + j + "=" (i*j));
}

}

it is almost in infinite loop; if you change int to long, and add more variables, you can practically make it last 25 x 10^12 minutes long