packagecom.test;publicclassMySession{publicstaticfinal ThreadLocal<MyDao>session=newInheritableThreadLocal<MyDao>();}publicclassMyDao{publicstaticLog2ContextgetInstance(){MyDao myDao=null;// 创建当前线程的myDao对象myDao=MySession.session.get();if(myDao==null){myDao=newMyDao();MySession.session....
注意到TestClassLoad类上不会有对类A的符号依赖——也就是说在加载并初始化TestClassLoad类时不需要关心类A的存在与否,而是等到main()方法执行到调用Class.forName()时才试图对类A做动态加载;这里用的是一个参数版的forName(),也就是使用当前方法所在类的ClassLoader来加载,并且初始化新加载的类。……好吧这个细...
The Throwable class is the superclass of all errors and exceptions in the Java language. Only objects that are instances of this class (or one of its subclasses) are thrown by the Java Virtual Machine or can be thrown by the Java throw statement. Similarly, only this class or one of its...
publicstaticvoidviewTable(Connection con)throwsSQLException {Stringquery="select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES";try(Statementstmt=con.createStatement()) {ResultSetrs=stmt.executeQuery(query);while(rs.next()) {StringcoffeeName=rs.getString("COF_NAME");intsupplierID=rs.getInt...
The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition. Object 类的 finalize 方法不执行任何特殊操作;它只是正常返回。 Object 的子类可以覆盖这个定义。 The Java programming language does not guarantee which thread will...
GetNestMembers GetPermittedSubclasses GetRecordComponents GetResource GetResourceAsStream GetSigners GetTypeParameters InvokeComponentType IsAnnotationPresent IsAssignableFrom IsInstance IsNestmateOf NewInstance ToGenericString Явныереализацииинтерфейса ...
Instances of the class Class represent classes and interfaces in a running Java application. An enum type is a kind of class and an annotation type is a kind of interface. Every array also belongs to a class that is reflected as a Class object that is shared by all arrays with the same...
The following sections summarize changes made in all Java SE 8u20 BPRs. Bug fixes and any other changes are listed below in date order, most current BPR first. Note that bug fixes in previous BPR are also included in the current BPR. To determine the version of your JDK software, use ...
static class SubClasser.MultiSubClasser A SubClasser that delegates to multiple SubClasses. static class SubClasser.Utilities Utilities for dealing with SubClassers. Field Summary Fields Modifier and TypeField and Description static java.lang.String CLASS_VERSION Class version string Method Summar...
Abstract class for reading character streams. The only methods that a subclass must implement are read(char[], int, int) and close(). Most subclasses, however, will override some of the methods defined here in order to provide higher efficiency, additional functionality, or both. ...