On whether try catch affects performance

In the actual project, IO, database, network and so on, will inevitably occur unknown exception, try catch can effectively avoid page crashes, online someone said a page four or five try catch affect efficiency, here is the validation:

Example: 100 threads, looping 100 times as an experimental unit:

Package Com.example;import Java.util.concurrent.executorservice;import Java.util.concurrent.executors;import java.util.concurrent.atomic.atomiclong;/** * @author Xuanyouwu * @email [email protected] * @time 2016-05-06 09:27 *    /public class Trycatchstudy {static Atomiclong taketime;    Static Atomiclong takeTime1; public static void Main (string[] args) throws Exception {Executorservice Executorservice = Executors.newcachedthre        Adpool ();        Taketime = new Atomiclong (0);        takeTime1 = new Atomiclong (0);            for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime = System.currenttimemillis ();                        for (int i = 0; i <; i++) {try {execute (); } catch (Exception e) {}/* try {                            Thread.Sleep (100); } catch (Exception e) {}*/} long endTime = System.currentti                    Memillis ();                    Taketime.addandget ((endtime-starttime));                    if (times = =) {System.out.println ("------->take Time:" + taketime.get ());        }                }            });            } for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime1 = System.currenttimemillis ();                    for (int i = 0; i <; i++) {execute ();                        /* Try {thread.sleep (100); } catch (Exception e) {}*/} long endTime1 = System.cuRrenttimemillis ();                    Taketime1.addandget ((endtime1-starttime1));                    if (times = =) {System.out.println ("------->take time2:" + taketime.get ());        }                }            });        }} public static void Execute () {int res = (((INTEGER.MAX_VALUE/2/3-1) * 2/5)-10 * 100)/2;        res--;        ++res;    res = RES/2; }}

Operation Result:

------->take Time:3
------->take Time2:3

Result: no millisecond-level gap

Turn on thread sleep:

Package Com.example;import Java.util.concurrent.executorservice;import Java.util.concurrent.executors;import java.util.concurrent.atomic.atomiclong;/** * @author Xuanyouwu * @email [email protected] * @time 2016-05-06 09:27 *    /public class Trycatchstudy {static Atomiclong taketime;    Static Atomiclong takeTime1; public static void Main (string[] args) throws Exception {Executorservice Executorservice = Executors.newcachedthre        Adpool ();        Taketime = new Atomiclong (0);        takeTime1 = new Atomiclong (0);            for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime = System.currenttimemillis ();                        for (int i = 0; i <; i++) {try {execute ();  } catch (Exception e) {} try {                          Thread.Sleep (100); } catch (Exception e) {}} long EndTime = System.currenttime                    Millis ();                    Taketime.addandget ((endtime-starttime));                    if (times = =) {System.out.println ("------->take Time:" + taketime.get ());        }                }            });            } for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime1 = System.currenttimemillis ();                        for (int i = 0; i <; i++) {execute ();                        try {thread.sleep (100); } catch (Exception e) {}} long endTime1 = System.currenttimEmillis ();                    Taketime1.addandget ((endtime1-starttime1));                    if (times = =) {System.out.println ("------->take time2:" + taketime.get ());        }                }            });        }} public static void Execute () {int res = (((INTEGER.MAX_VALUE/2/3-1) * 2/5)-10 * 100)/2;        res--;        ++res;    res = RES/2; }}

Operation Result:

------->take time2:601414
------->take time:631501

Loop 1 million times:

Package Com.example;import Java.util.concurrent.executorservice;import Java.util.concurrent.executors;import java.util.concurrent.atomic.atomiclong;/** * @author Xuanyouwu * @email [email protected] * @time 2016-05-06 09:27 *    /public class Trycatchstudy {static Atomiclong taketime;    Static Atomiclong takeTime1; public static void Main (string[] args) throws Exception {Executorservice Executorservice = Executors.newcachedthre        Adpool ();        Taketime = new Atomiclong (0);        takeTime1 = new Atomiclong (0);            for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime = System.currenttimemillis ();                        for (int i = 0; i < 100_0000; i++) {try {execute ();     } catch (Exception e) {}}               Long endTime = System.currenttimemillis ();                    Taketime.addandget ((endtime-starttime));                    if (times = =) {System.out.println ("------->take Time:" + taketime.get ());        }                }            });            } for (int j = 0; J <; J + +) {int times = j; Executorservice.execute (New Runnable () {@Override public void run () {Lo                    ng startTime1 = System.currenttimemillis ();                    for (int i = 0; i < 100_0000; i++) {execute ();                    } Long endTime1 = System.currenttimemillis ();                    Taketime1.addandget ((endtime1-starttime1));                    if (times = =) {System.out.println ("------->take time2:" + taketime.get ());        }                }            }); }} public staticvoid execute () {int res = (((INTEGER.MAX_VALUE/2/3-1) * 2/5)-10 * 100)/2;        res--;        ++res;    res = RES/2; }}

Operation Result:

------->take time:48
------->take time2:164

Conclusion The general application can completely ignore the efficiency effect of Try catch, when millions of big data concurrency, there is a second gap, the app can be ignored, the background should be considered properly

On whether try catch affects performance