The classes that I've presented to this point are known as top-level classes . They don't belong to another class or structure. However, Java also lets you declare classes in other classes, blocks (groups of zero or more statements between { and } characters), and expression contexts....
publicbooleanisLocalClass(){ returnisLocalOrAnonymousClass()&&!isAnonymousClass(); } 代码示例来源:origin: jtulach/bck2brwsr /** * Returns {@code true} if and only if the underlying class is a local * class. * * @return {@code true} if and only if this class is a local class. *...
publicclassMyThreadLocal{privatestaticSimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd hh:mm:ss");publicstaticStringdate(intseconds){Datedate=newDate(1000* seconds);Strings=null;synchronized(MyThreadLocal.class) { s = sdf.format(date); }// Date date = new Date(1000 * seconds);returns; }...
It is possible to declare a local inner class, or an anonymous inner class, in a static context: within a static method, a static initialization block, or as part of a static initializer. In these static contexts there is no corresponding instance of the enclosing class, and so the local...
staticclassThreadLocalMap {/*** The entries in this hash map extend WeakReference, using * its main ref field as the key (which is always a * ThreadLocal object). Note that null keys (i.e. entry.get() * == null) mean that the key is no longer referenced, so the ...
* subclassed, and this method overridden. Typically, an * anonymous inner class will be used. * *@returnthe initial value for this thread-local */ protectedTinitialValue(){ returnnull; } 初始化值,默认为null,实际使用时,可根据具体使用场景,通过重写的方式,设置对应的初始化值。如Integer设置初始化...
* subclassed, and this method overridden. Typically, an * anonymous inner class will be used. * * @return the initial value for this thread-local */ protected T initialValue() { return null; } 变量的初始化操作在这里完成,默认返回null,建议override此方法,确保get之前已进行过set操作,防止get的时...
* subclassed, and this method overridden. Typically, an * anonymous inner class will be used. * * @return the initial value for this thread-local */protectedTinitialValue(){returnnull;} initialValue方法是该类作者提供给使用者供其产生局部变量的方法。
* subclassed, and this method overridden. Typically, an * anonymous inner class will be used. * * @return the initial value for this thread-local */protectedTinitialValue(){returnnull;}/** * Creates a thread local variable. The initial value of the variable is ...
This implementation simply returns null; if the programmer desires thread-local variables to have an initial value other than null, ThreadLocal must be subclassed, and this method overridden. Typically, an anonymous inner class will be used. Returns: the initial value for this thread-local withInit...