Java中StopWatch工具类的用法详解

public static void main(string[] args) throws interruptedexception {
    test0();
}
 
public static void test0() throws interruptedexception {
    long start = system.currenttimemills();
    // do something
    thread.sleep(100);
    long end = system.currenttimemills();
    long start2 = system.currenttimemills();
    // do somethind
    long end2 = system.currenttimemills();
 
    system.out.println("某某1执行耗时:" + (end -start));
    system.out.println("某某2执行耗时:" + (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");
       sw.start("task1");
       // do something
       thread.sleep(100);
       sw.stop();
       sw.start("task2");
       // do someting
       thread.sleep(200);
       sw.stop();
       system.out.println("sw.prettyprint()-------");
       system.out.println(sw.prettyprint());
 
 
    }
 
 
}

import java.text.numberformat;
import java.util.linkedlist;
import java.util.list;
 
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 stopwatch.taskinfo lasttaskinfo;
    private int taskcount;
    private long totaltimemillis;
 
    public stopwatch() {
        this.id = "";
    }
 
    public stopwatch(string id) {
        this.id = id;
    }
 
    public void setkeeptasklist(boolean keeptasklist) {
        this.keeptasklist = keeptasklist;
    }
 
    public void start() throws illegalstateexception {
        this.start("");
    }
 
    public void start(string taskname) throws illegalstateexception {
        if (this.running) {
            throw new illegalstateexception("can't start stopwatch: it's already running");
        } else {
            this.starttimemillis = system.currenttimemillis();
            this.running = true;
            this.currenttaskname = taskname;
        }
    }
 
    public void stop() throws illegalstateexception {
        if (!this.running) {
            throw new illegalstateexception("can't stop stopwatch: it's not running");
        } else {
            long lasttime = system.currenttimemillis() - this.starttimemillis;
            this.totaltimemillis += lasttime;
            this.lasttaskinfo = new stopwatch.taskinfo(this.currenttaskname, lasttime);
            if (this.keeptasklist) {
                this.tasklist.add(this.lasttaskinfo);
            }
 
            ++this.taskcount;
            this.running = false;
            this.currenttaskname = null;
        }
    }
 
    public boolean isrunning() {
        return this.running;
    }
 
    public long getlasttasktimemillis() throws illegalstateexception {
        if (this.lasttaskinfo == null) {
            throw new illegalstateexception("no tasks run: can't get last task interval");
        } else {
            return this.lasttaskinfo.gettimemillis();
        }
    }
 
    public string getlasttaskname() throws illegalstateexception {
        if (this.lasttaskinfo == null) {
            throw new illegalstateexception("no tasks run: can't get last task name");
        } else {
            return this.lasttaskinfo.gettaskname();
        }
    }
 
    public stopwatch.taskinfo getlasttaskinfo() throws illegalstateexception {
        if (this.lasttaskinfo == null) {
            throw new illegalstateexception("no tasks run: can't get last task info");
        } else {
            return this.lasttaskinfo;
        }
    }
 
    public long gettotaltimemillis() {
        return this.totaltimemillis;
    }
 
    public double gettotaltimeseconds() {
        return (double) this.totaltimemillis / 1000.0d;
    }
 
    public int gettaskcount() {
        return this.taskcount;
    }
 
    public stopwatch.taskinfo[] gettaskinfo() {
        if (!this.keeptasklist) {
            throw new unsupportedoperationexception("task info is not being kept!");
        } else {
            return (stopwatch.taskinfo[]) this.tasklist.toarray(new stopwatch.taskinfo[this.tasklist.size()]);
        }
    }
 
    public string shortsummary() {
        return "stopwatch '" + this.id + "': running time (millis) = " + this.gettotaltimemillis();
    }
 
    public string prettyprint() {
        stringbuilder sb = new stringbuilder(this.shortsummary());
        sb.append('\n');
        if (!this.keeptasklist) {
            sb.append("no task info kept");
        } else {
            sb.append("-----------------------------------------\n");
            sb.append("ms     %     task name\n");
            sb.append("-----------------------------------------\n");
            numberformat nf = numberformat.getnumberinstance();
            nf.setminimumintegerdigits(5);
            nf.setgroupingused(false);
            numberformat pf = numberformat.getpercentinstance();
            pf.setminimumintegerdigits(3);
            pf.setgroupingused(false);
            stopwatch.taskinfo[] var7;
            int var6 = (var7 = this.gettaskinfo()).length;
 
            for (int var5 = 0; var5 < var6; ++var5) {
                stopwatch.taskinfo task = var7[var5];
                sb.append(nf.format(task.gettimemillis())).append("  ");
                sb.append(pf.format(task.gettimeseconds() / this.gettotaltimeseconds())).append("  ");
                sb.append(task.gettaskname()).append("\n");
            }
        }
 
        return sb.tostring();
    }
 
    @override
    public string tostring() {
        stringbuilder sb = new stringbuilder(this.shortsummary());
        if (this.keeptasklist) {
            stopwatch.taskinfo[] var5;
            int var4 = (var5 = this.gettaskinfo()).length;
 
            for (int var3 = 0; var3 < var4; ++var3) {
                stopwatch.taskinfo task = var5[var3];
                sb.append("; [").append(task.gettaskname()).append("] took ").append(task.gettimemillis());
                long percent = math.round(100.0d * task.gettimeseconds() / this.gettotaltimeseconds());
                sb.append(" = ").append(percent).append("%");
            }
        } else {
            sb.append("; no task info kept");
        }
 
        return sb.tostring();
    }
 
    public static final class taskinfo {
        private final string taskname;
        private final long timemillis;
 
        taskinfo(string taskname, long timemillis) {
            this.taskname = taskname;
            this.timemillis = timemillis;
        }
 
        public string gettaskname() {
            return this.taskname;
        }
 
        public long gettimemillis() {
            return this.timemillis;
        }
 
        public double gettimeseconds() {
            return (double) this.timemillis / 1000.0d;
        }
    }
 
}