System.getProperties().put("http.proxyHost","someProxyURL");System.getProperties().put("http.proxyPort","someProxyPort");System.getProperties().put("http.proxyUser","someUserName");System.getProperties().put("http.proxyPassword","somePassword");
　　System.getProperties().put("http.proxyHost","someProxyURL");System.getProperties().put("http.proxyPort","someProxyPort");System.getProperties().put("http.proxyUser","someUserName");System.getProperties().put("http.proxyPassword","somePassword");12.Java Singleton exampleRead this article formore details.Update:Thanks Markus for the comment. I have updatedthe code and changedit to
　　more robust implementation.
　　public class SimpleSingleton private staticSimpleSingletonsingleInstance = new SimpleSingleton(); //Markingdefaultconstructor private //to avoid direct instantiation.privateSimpleSingleton() //Get instance for class SimpleSingletonpublicstatic SimpleSingleton getInstance() returnsingleInstance;
　　public class SimpleSingleton private staticSimpleSingletonsingleInstance = new SimpleSingleton();
　　//Marking default constructor private//to avoiddirectinstantiation.private SimpleSingleton()
　　//Get instance for class SimpleSingletonpublicstaticSimpleSingleton getInstance()
　　return singleInstance;One more implementation of Singletonclass.Thanks to Ralph and Lukasz Zielinski
　　for pointing this out.
　　public enum SimpleSingleton INSTANCE; publicvoiddoSomething()//Call the method fromSingleton:SimpleSingleton.INSTANCE.doSomething();
　　public enum SimpleSingleton INSTANCE;public voiddoSomething()
　　//Call the methodfromSingleton:SimpleSingleton.INSTANCE.doSomething();