how I can exit from a loop in one second using Runtime?

Question

how I can exit from a loop in one second using Runtime? I want use this code

public class test {
    public static void main(String[] args) {
    Runtime runtime = Runtime.getRuntime();
    long usedMemory = runtime.totalMemory()-runtime.freeMemory();
    int mbytes = (int) usedMemory/1000; // Used memory (Mbytes)
    String str="a";

        while (somthing < one second ) {


       }
}

I want to count how many string can I add in one second like while (somthing < one second) { str=str + "a"; } @user2310289 System.out.println(str); — user3222289, Mar 07 '14 at 07:49

Subhrajyoti Majumder · Accepted Answer · 2014-03-07T07:52:39.503

1

long startTime = System.currentTimeMillis();

while((System.currentTimeMillis()-startTime)<=1000){
     str=str + "a"; 
}

edited Mar 07 '14 at 07:52

answered Mar 07 '14 at 07:42

Subhrajyoti Majumder

40,646
13
77
103

I want to count how many string can I add in one second like while (somthing < one second) { str=str + "a"; } System.out.println(str); – user3222289 Mar 07 '14 at 07:46
` long startTime = System.currentTimeMillis(); String str ="a"; while((System.currentTimeMillis()-startTime)<=1000L){ str=str + "a"; } System.out.println(str.length());` – Subhrajyoti Majumder Mar 07 '14 at 08:06
I can print str.length() but not str !! – user3222289 Mar 07 '14 at 08:11

Scary Wombat · Answer 2 · 2014-03-07T08:02:19.103

1

ok to do this you need to records the start time, and then compare it to the current time as you go.

    long start = System.currentTimeMillis();
    String str="a";
    while (true) {
        long now = System.currentTimeMillis();
        if (now - start > 1000)
             break;

        // do your stuff
        str=str + "a"; 
    }

    System.out.println (str);

The above code will probably spend more time getting the time that doing the stuff you want though

edited Mar 07 '14 at 08:02

answered Mar 07 '14 at 07:51

Scary Wombat

44,617
6
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That because I did not put your code in my code. I simply put a comment saying //do your stuff. I will update. – Scary Wombat Mar 07 '14 at 08:02
On my slow machine, I can do it about 37443 times. `System.out.println (str1.length());` – Scary Wombat Mar 07 '14 at 08:07
I can print str.length() but not str !! – user3222289 Mar 07 '14 at 08:12
Please update your code in your question. Then we can see what is wrong. – Scary Wombat Mar 07 '14 at 08:13

score 0 · Answer 3 · answered Mar 07 '14 at 07:53

0

 long startTime = System.currentTimeMillis();
 while((System.currentTimeMillis()-startTime)<1000){
// Your task goes here
}

answered Mar 07 '14 at 07:53

Subir Kumar Sao

8,171
3
26
47

I want to count how many string can I add in one second like while (somthing < one second) { str=str + "a"; } System.out.println(str); – user3222289 Mar 07 '14 at 08:07

score 0 · Answer 4 · answered Mar 07 '14 at 07:53

0

Write your code in while loop. It will exit the loop after 1 second.

long start = System.currentTimeMillis();
long end = start + 1000; //  1000 ms/sec
while (System.currentTimeMillis() < end)
{
    // Write your code here
}

answered Mar 07 '14 at 07:53

kaushik parmar

805
6
19

score 0 · Answer 5 · answered Mar 07 '14 at 07:54

i think that you can use something like this if you don't really need to use Runtime.

public class test {
    public static void main(String[] args) {
    long startTime = System.currentTimeMillis();
    long currentTime = System.currentTimeMillis();
    long usedMemory = runtime.totalMemory()-runtime.freeMemory();
    int mbytes = (int) usedMemory/1000; // Used memory (Mbytes)
    String str="a";

    while (currentTime-startTime<1000) {
        currentTime = System.currentTimeMillis();
    }
}

how I can exit from a loop in one second using Runtime?

5 Answers5