2017年9月7日
摘要：
Provider.java Service.java Services.java Test.java 阅读全文
摘要：
public enum Elvis { INSTANCE; public void leaveTheBuilding() { System.out.println("Whoa baby, I'm outta here!"); } // This code would normally appear outside the class! public static void ma... 阅读全文
摘要：
public class UtilityClass { // Suppress default constructor for noninstantiability private UtilityClass() { throw new AssertionError(); } } 阅读全文