How do I fix a compilation error for unhandled exception on call to Thread sleep

Question

I am new to Java and kind of new to programming  I know diving straight into Java probably wasn t the greatest idea   and I ve been getting an error consistently no matter how I try to add a pause in my program  I am doing a simple counting program and want to add a one second delay between each number here is the code I have so far    import java lang     public class Counter       public static void main String  args                int i           for  i   0  i  lt   10  i                          Thread sleep 1000               System out println i                     System out println  You can count to ten               The call to Thread sleep   won t compile  The javac compiler says   unreported exception InterruptedException  must be caught or declared to be thrown  and Eclipse says   Unhandled exception type InterruptedException

User · Answer

You can get rid of the first line  You don t need import java lang     Just change your 5th line to   public static void main String    args  throws Exception

User · Answer

Thread sleep can throw an InterruptedException which is a checked exception  All checked exceptions must either be caught and handled or else you must declare that your method can throw it  You need to do this whether or not the exception actually will be thrown  Not declaring a checked exception that your method can throw is a compile error   You either need to catch it   try       Thread sleep 1000     catch  InterruptedException e        e printStackTrace           handle the exception                   For example consider calling Thread currentThread   interrupt    here      Or declare that your method can throw an InterruptedException   public static void main String  args  throws InterruptedException   Related   Lesson - Exceptions When does Java  39 s Thread sleep throw InterruptedException  Java theory and practice  Dealing with InterruptedException

[java] How do I fix a compilation error for unhandled exception on call to Thread.sleep()?

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