1. 静态方法中能不能使用 this?不能!因为静态方法是属于类的,而 this 是属于实例的。在静态方法中,this 根本不存在。错误示例:2. this 可以出现在匿名内部类中吗?可以!但是要注意 this 的含义。匿名内部类中,this 指的是匿名类实例,而不是外部类实例。如果需要引用外部类,可以用 外部类名.this
Java 中的 this 关键字可以用来引用当前对象的实例。下面是一些常见的用法:2.1 引用当前对象的实例变量 在上面的代码中,thist.name 引用了当前对象的 name 实例变量。2.2 调用当前对象的构造函数 在上面的代码中,this("John Doe", 30) 调用了当前对象的另一个构造函数 2.3 引用当前对象的方法 在上面的...
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*/publicstaticvoidprintKeyValue(InputStream inputStream)throws IOException{Properties properties=newProperties();properties.load(inputStream);Set<Object>keys=properties.keySet();for(Object key:keys){System.out.println(key+" = "+properties.get(key));}if(inputStream!=null){inputStream.close();}}pub...
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在Java JDK 1.5 中还引入了一种更加简洁的、方便对数组和集合进行遍历的方法,即for-each语句,例子如下: intarray[] = {7,8,9};for(intarr : array) { System.out.println(arr); } 跳转语句 Java 语言中,有三种跳转语句:break、continue 和 return。
在 “Entry Set”中等待的线程状态是 “Waiting for monitor entry”,而在 “Wait Set”中等待的线程状态是 “in Object.wait()”。 先看 “Entry Set”里面的线程。我们称被 synchronized保护起来的代码段为临界区。当一个线程申请进入临界区时,它就进入了 “Entry Set”队列。对应的 code就像: synchronized(...
This was due, in large part, to it being included with IBM-DOS and MS-DOS packages. In fact, original IBM PC systems had BASIC in ROM, to save RAM space for programs. The first IBM PC had 64 Kbytes of RAM and a floppy disk drive was optional. If no disk drive was present, the...
ProducerConsumerExample pc = new ProducerConsumerExample(); // 创建生产者线程 Thread producerThread = new Thread(() -> { try { for (int i = 0; i pc.produce(); Thread.sleep(100); // 模拟生产耗时 } } catch (InterruptedException e) { ...