Java High-quality code notes

"Try to write unit tests."

There are many other different test frameworks for Android, which uses JUnit in general.

See the importance of unit testing: http://www.csdn.net/article/2012-04-10/2804366

"" It is strongly recommended to use UTF-8 encoding

"" Performance considerations, arrays are preferred

"" Thread-safe Singleton mode

public final class doublecheckedsingleton   {        private static DoubleCheckedSingletonsingObj = null;           private doublecheckedsingleton () {        }          public static  Doublecheckedsingleton getsingleinstance () {            if (null == singobj )  {                synchronized (Doublecheckedsingleton.class) {                       if (null = = singobj)                        &nbsP;     singobj = new doublecheckedsingleton ();                }           }        return singObj;      }   }

Another way: http://www.it165.net/pro/html/201403/11212.html

Package com.troy.young.thread;/*** Thread-Safe Singleton class * * @author Administrator**/public class SingleTon {/*** defines his method of construction, There is no way outside to construct the object with new */private SingleTon () {}/*** defines an inner class to instantiate the Singleton. * First the inner class is static, guaranteeing that the class has only one copy in memory, and that his member variable is final static, again guaranteeing his uniqueness. * At the same time because the JLS will guarantee the thread safety of the class. * @author administrator**/private Static class Singletonholder {Public final static SingleTon instance = new SingleTon ();} /*** provides a way to get an instance of * @return */public static SingleTon getinstance () {//Get the variables of the inner class directly return singletonholder.instance;}}

"" Multithreading using vectors or HashTable

"" using enumerations to implement factory method patterns is more concise

UML diagrams show Fordcar and Buickcar:

DEMO:

 public class test {  enum carfactory {  fordcar {    public car create ()  {    return new fordcar ();    }  },  buickcar {   public car create ()  {    return new buickcar ();   }  };   Public car create1 ()  {   switch  (this)  {   case  Fordcar:    return new fordcar ();   case ... ...    default:    throw new assertionerror ("Invalid parameter");    }   }  public abstract car create (); }  public void  Test ()  {  carfactory.buickcar.create ();   carfactory.buickcar.create1 ();  } }

Java High-quality code notes