Question

Create a class called Stopwatch that contains the following:

- Private data fields startTime and endTime with getter methods.

- A no-arg constructor that initializes startTime with the current time.

- A method named start() that resets the startTime to the cur- rent time.

- A method named stop() that sets the endTime to the current time.

-A method named getElapsedTime() that returns the elapsed time for the stopwatch in milliseconds.

Create a program that utilizes a StopWatch to measture how long it takes to print "Hello" 100,000 times.

Answer 1

package practice;

public class Stopwatch {
  
   private long startTime;
   private long endTime;
  
       //Private data fields startTime and endTime with getter methods.
   public long getStartTime()
   {
         
         
       return startTime;
   }
   public long getEndTime()
   {
         
         
       return endTime;
   }

   //- A no-arg constructor that initializes startTime with the current time.
     
   public Stopwatch()
   {
       startTime=System.currentTimeMillis();
         
         
   }

   //- A method named start() that resets the startTime to the cur- rent time.
   public void start()
   {
       startTime=System.currentTimeMillis();
         
         
   }

   //- A method named stop() that sets the endTime to the current time.
   public void stop()
   {
       endTime=System.currentTimeMillis();
         
         
   }

   //-A method named getElapsedTime() that returns the elapsed time for the stopwatch in milliseconds.
     
   public long getElapsedTime()
   {
         
         
       return endTime-startTime;
   }

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
       Stopwatch st=new Stopwatch();
      
      
       st.start();
      
       for(int i=0;i<100000;i++)
           System.out.println((i+1)+" Hello");
      
       st.stop();
      
       System.out.println("Time required to print Hello 10000 in milliseconds is : " +st.getElapsedTime());

   }

}

Sample Run:

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