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What is an Iterator interface?
What is an Iterator interface? The Iterator interface is used to step through the elements of a Collection. 2012-06-21, 2816👍, 0💬

If a method is declared as protected, where may the method be accessed?
If a method is declared as protected, where may the method be accessed? A protected method may only be accessed by classes or interfaces of the same package or by subclasses of the class in which it is declared. 2012-06-21, 3061👍, 0💬

What modifiers may be used with an inner class that is a member of an outer class?
What modifiers may be used with an inner class that is a member of an outer class? A (non-local) inner class may be declared as public, protected, private, static, final, or abstract. 2012-06-20, 2705👍, 0💬

What is the Vector class?
What is the Vector class? The Vector class provides the capability to implement a growable array of objects 2012-06-20, 2807👍, 0💬

What can go wrong if you replace &emp;&emp; with &emp; in the following code: String a=null; if (a!=null && a.length()&gt;10) {
What can go wrong if you replace &emp;&emp; with &emp; in the following code: String a=null; if (a!=null && a.length()&gt;10) {...} A single ampersand here would lead to a NullPointerException. 2012-06-19, 2951👍, 0💬

Can an inner class declared inside of a method access local variables of this method?
Can an inner class declared inside of a method access local variables of this method? It's possible if these variables are final. 2012-06-19, 2919👍, 0💬

What is the difference between Process and Thread?
What is the difference between Process and Thread? A process can contain multiple threads. In most multithreading operating systems, a process gets its own memory address space; a thread doesn't. Threads typically share the heap belonging to their parent process. For instance, a JVM runs in a single... 2012-06-18, 2924👍, 0💬

What happens when a thread cannot acquire a lock on an object?
What happens when a thread cannot acquire a lock on an object? If a thread attempts to execute a synchronized method or synchronized statement and is unable to acquire an object's lock, it enters the waiting state until the lock becomes available. 2012-06-18, 2830👍, 0💬

What is the difference between yielding and sleeping?
What is the difference between yielding and sleeping? When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state. 2012-06-15, 2828👍, 0💬

What are the high-level thread states?
What are the high-level thread states? The high-level thread states are ready, running, waiting, and dead. 2012-06-15, 3031👍, 0💬

What is the purpose of the wait(), notify(), and notifyAll() methods?
What is the purpose of the wait(), notify(), and notifyAll() methods? The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to communicate each other. 2012-06-14, 3170👍, 0💬

What invokes a thread's run() method?
What invokes a thread's run() method? After a thread is started, via its start() method of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed. 2012-06-14, 2850👍, 0💬

Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written?
Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written? Yes, it does. The FileNoFoundException is inherited from the IOException. Exception's subclasses have to be caught first. 2012-06-13, 2871👍, 0💬

Can each Java object keep track of all the threads that want to exclusively access to it?
Can each Java object keep track of all the threads that want to exclusively access to it? Yes. Use Thread.currentThread() method to track the accessing thread. 2012-06-13, 2876👍, 0💬

Can Java object be locked down for exclusive use by a given thread?
Can Java object be locked down for exclusive use by a given thread? Yes. You can lock an object by putting it in a "synchronized" block. The locked object is inaccessible to any thread other than the one that explicitly claimed it. 2012-06-11, 2850👍, 0💬

How to create a thread in a program?
How to create a thread in a program? You have two ways to do so. First, making your class "extends" Thread class. Second, making your class "implements" Runnable interface. Put jobs in a run() method and call start() method to start the thread. 2012-06-11, 2838👍, 0💬

How does multi-threading take place on a computer with a single CPU?
How does multi-threading take place on a computer with a single CPU? The operating system's task scheduler allocates execution time to multiple tasks. By quickly switching between executing tasks, it creates the impression that tasks execute sequentially. 2012-06-08, 3047👍, 0💬

What is multi-threading?
What is multi-threading? Multi-threading means various threads that run in a system. 2012-06-08, 2853👍, 0💬

What is thread?
What is thread? A thread is an independent path of execution in a system. 2012-06-07, 2633👍, 0💬

What would you use to compare two String variables - the operator == or the method equals()?
What would you use to compare two String variables - the operator == or the method equals()? I'd use the method equals() to compare the values of the Strings and the == to check if two variables point at the same instance of a String object. 2012-06-07, 2806👍, 0💬

What's the difference between J2SDK 1.5 and J2SDK 5.0?
What's the difference between J2SDK 1.5 and J2SDK 5.0? There's no difference, Sun Microsystems just re-branded this version. 2012-06-06, 3438👍, 0💬

What is the preferred size of a component?
What is the preferred size of a component? The preferred size of a component is the minimum component size that will allow the component to display normally. 2012-06-06, 2859👍, 0💬

What's new with the stop(), suspend() and resume() methods in JDK 1.2?
What's new with the stop(), suspend() and resume() methods in JDK 1.2? The stop(), suspend() and resume() methods have been deprecated in JDK 1.2. 2012-06-05, 2950👍, 0💬

Can a lock be acquired on a class?
Can a lock be acquired on a class? Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object. 2012-06-05, 2828👍, 0💬

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