Detailed explanation of the usage of StopWatch tool class in Java

public static void main(String[] args) throws InterruptedException {
    test0();
}
 
public static void test0() throws InterruptedException {
    long start = ();
    // do something
    (100);
    long end = ();
    long start2 = ();
    // do somethind
    long end2 = ();
 
    ("So-1 execution takes time:" + (end -start));
    ("So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So-So- + (end2 -start2));
 
    
}

public class StopWatchDemo {
 
    public static void main(String[] args) throws InterruptedException {
         test1();
    }
 
     public static void test1() throws InterruptedException {
 
       StopWatch sw = new StopWatch("test");
       ("task1");
       // do something
       (100);
       ();
       ("task2");
       // do someting
       (200);
       ();
       ("()-------");
       (());
 
 
    }
 
 
}

import ;
import ;
import ;
 
public class StopWatch {
    private final String id;
    private boolean keepTaskList = true;
    private final List<TaskInfo> taskList = new LinkedList();
    private long startTimeMillis;
    private boolean running;
    private String currentTaskName;
    private  lastTaskInfo;
    private int taskCount;
    private long totalTimeMillis;
 
    public StopWatch() {
         = "";
    }
 
    public StopWatch(String id) {
         = id;
    }
 
    public void setKeepTaskList(boolean keepTaskList) {
         = keepTaskList;
    }
 
    public void start() throws IllegalStateException {
        ("");
    }
 
    public void start(String taskName) throws IllegalStateException {
        if () {
            throw new IllegalStateException("Can't start StopWatch: it's already running");
        } else {
             = ();
             = true;
             = taskName;
        }
    }
 
    public void stop() throws IllegalStateException {
        if (!) {
            throw new IllegalStateException("Can't stop StopWatch: it's not running");
        } else {
            long lastTime = () - ;
             += lastTime;
             = new (, lastTime);
            if () {
                ();
            }
 
            ++;
             = false;
             = null;
        }
    }
 
    public boolean isRunning() {
        return ;
    }
 
    public long getLastTaskTimeMillis() throws IllegalStateException {
        if ( == null) {
            throw new IllegalStateException("No tasks run: can't get last task interval");
        } else {
            return ();
        }
    }
 
    public String getLastTaskName() throws IllegalStateException {
        if ( == null) {
            throw new IllegalStateException("No tasks run: can't get last task name");
        } else {
            return ();
        }
    }
 
    public  getLastTaskInfo() throws IllegalStateException {
        if ( == null) {
            throw new IllegalStateException("No tasks run: can't get last task info");
        } else {
            return ;
        }
    }
 
    public long getTotalTimeMillis() {
        return ;
    }
 
    public double getTotalTimeSeconds() {
        return (double)  / 1000.0D;
    }
 
    public int getTaskCount() {
        return ;
    }
 
    public [] getTaskInfo() {
        if (!) {
            throw new UnsupportedOperationException("Task info is not being kept!");
        } else {
            return ([]) (new [()]);
        }
    }
 
    public String shortSummary() {
        return "StopWatch '" +  + "': running time (millis) = " + ();
    }
 
    public String prettyPrint() {
        StringBuilder sb = new StringBuilder(());
        ('\n');
        if (!) {
            ("No task info kept");
        } else {
            ("-----------------------------------------\n");
            ("ms     %     Task name\n");
            ("-----------------------------------------\n");
            NumberFormat nf = ();
            (5);
            (false);
            NumberFormat pf = ();
            (3);
            (false);
            [] var7;
            int var6 = (var7 = ()).length;
 
            for (int var5 = 0; var5 < var6; ++var5) {
                 task = var7[var5];
                ((())).append("  ");
                ((() / ())).append("  ");
                (()).append("\n");
            }
        }
 
        return ();
    }
 
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(());
        if () {
            [] var5;
            int var4 = (var5 = ()).length;
 
            for (int var3 = 0; var3 < var4; ++var3) {
                 task = var5[var3];
                ("; [").append(()).append("] took ").append(());
                long percent = (100.0D * () / ());
                (" = ").append(percent).append("%");
            }
        } else {
            ("; no task info kept");
        }
 
        return ();
    }
 
    public static final class TaskInfo {
        private final String taskName;
        private final long timeMillis;
 
        TaskInfo(String taskName, long timeMillis) {
             = taskName;
             = timeMillis;
        }
 
        public String getTaskName() {
            return ;
        }
 
        public long getTimeMillis() {
            return ;
        }
 
        public double getTimeSeconds() {
            return (double)  / 1000.0D;
        }
    }
 
}