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Nathan Hughes
Nathan Hughes
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Gray
Gray
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I have the following code:-

package com.amazon.payrollcalculationengineservice.accessor; class ThreadB extends Thread {   int total; @Override public void run() { synchronized (this){ for(int i=0; i<5; i++){ total+=i; } } } } public class Solution {   public static void main(String[] args) throws InterruptedException {   ThreadB b = new ThreadB();   b.start();   synchronized (b){ b.wait(); }   System.out.println(b.total);   }   }

Whenever I run this I get my output as 10. If I comment the wait line I get the output as 0 always.

I am confused as to why do I get my answer as 10 always. There are 2 threads , ThreadB and main thread so when I execute the wait method then ThreadB should be waiting as per definition and values should not get added and hence 0 should be printed by main thread then?

I have the following code:-

package com.amazon.payrollcalculationengineservice.accessor; class ThreadB extends Thread{   int total; @Override public void run() { synchronized (this){ for(int i=0; i<5; i++){ total+=i; } } } } public class Solution {   public static void main(String[] args) throws InterruptedException {   ThreadB b = new ThreadB();   b.start();   synchronized (b){ b.wait(); }   System.out.println(b.total);   }   }

Whenever I run this I get my output as 10. If I comment the wait line I get the output as 0 always.

I am confused as to why do I get my answer as 10 always. There are 2 threads , ThreadB and main thread so when I execute the wait method then ThreadB should be waiting as per definition and values should not get added and hence 0 should be printed by main thread then?

I have the following code:-

class ThreadB extends Thread { int total; @Override public void run() { synchronized (this){ for(int i=0; i<5; i++){ total+=i; } } } } public class Solution { public static void main(String[] args) throws InterruptedException { ThreadB b = new ThreadB(); b.start(); synchronized (b){ b.wait(); } System.out.println(b.total); } }

Whenever I run this I get my output as 10. If I comment the wait line I get the output as 0 always.

I am confused as to why do I get my answer as 10 always. There are 2 threads , ThreadB and main thread so when I execute the wait method then ThreadB should be waiting as per definition and values should not get added and hence 0 should be printed by main thread then?

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Saksham Agarwal
Saksham Agarwal
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Understanding Wait in Thread Java

I have the following code:-

package com.amazon.payrollcalculationengineservice.accessor; class ThreadB extends Thread{ int total; @Override public void run() { synchronized (this){ for(int i=0; i<5; i++){ total+=i; } } } } public class Solution { public static void main(String[] args) throws InterruptedException { ThreadB b = new ThreadB(); b.start(); synchronized (b){ b.wait(); } System.out.println(b.total); } }

Whenever I run this I get my output as 10. If I comment the wait line I get the output as 0 always.

I am confused as to why do I get my answer as 10 always. There are 2 threads , ThreadB and main thread so when I execute the wait method then ThreadB should be waiting as per definition and values should not get added and hence 0 should be printed by main thread then?