StringBuilder is single-threaded in Java, stringbuffer the opposite

There is no sycronized modifier method, is thread unsafe,--stringbuffer to compensate for this shortcoming, but the speed is slow

And it's not tested:

1 /**2  * 3  */4  Packagecom.breaver.test.string;5 6 /**7  * @authorZzf8 * @date June 22, 2017 PM 11:09:369  */Ten  Public classTeststringbuilderImplementsrunnable{ One      Public StaticStringBuilder strs=NewStringBuilder ("My-str:"); A     PrivateString str; -     /** -      * @paramargs the      */ -      -      Public Static voidMain (string[] args) { -         //TODO auto-generated Method Stub + //teststringbuilder.test (); -         NewThread (NewTeststringbuilder ("123") . Start (); +         NewThread (NewTeststringbuilder ("abc")) . Start (); A     } at      PublicTeststringbuilder (String a) { -         Super(); -         //TODO auto-generated Constructor stub -Str=A; -     } - @Override in      Public voidrun () { -         //TODO auto-generated Method Stub to         Try{ +              while(true){ - System.out.println (strs.tostring ()); theThread.Sleep (1000); * strs.append (str); $             }Panax Notoginseng}Catch(Exception e) { -             //Todo:handle Exception the e.printstacktrace (); +         } A     } the      Public Static voidTest () { +StringBuilder Builder =NewStringBuilder (); -System.out.println (builder.tostring () + ":" +builder.capacity ()); $Builder.append ("123"); $System.out.println (builder.tostring () + ":" +builder.capacity ()); -Builder.append ("asssssssssssssqwqw123"); -System.out.println (builder.tostring () + ":" +builder.capacity () the+ ":: fact-size:" +builder.length ()); -Builder.append ("Aasssssssssssssqwqw123");WuyiSystem.out.println (builder.tostring () + ":" +builder.capacity () the+ ":: fact-size:" +builder.length ()); -     } Wu}

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StringBuilder is single-threaded in Java, stringbuffer the opposite