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Blocked state A thread that is waiting for a resource, such as a lock, to become available is said to be in a blocked state. Blocked threads consume no processor resources. Boolean expression An expression that results in a value of true or false. Typically, this involves a comparison (e.g., x > 2) or a boolean condition such as (x < 5 && y > 3), but can also involve a method with a boolean return type. boolean primitives true or false. A primitive boolean value can be defined only as either
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Call stack A call stack is a list of methods that have been called in the order in which they were called. Typically, the most recently called method (the current method) is thought of as being at the top of the call stack. Casting Casting is the conversion of one type to another type. Typically, casting is used to convert an object reference to either a subtype (for example, casting an Animal reference to a Horse), but casting can also be used on primitive types to convert a larger type to a smaller type, such as from a long to an int. char A char is a 16-bit unsigned primitive data type that holds a single Unicode character. Character literals Character literals are represented by a single character in single quotes, such as A . Child class See Derived class.
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Class A class is the definition of a type. It is the blueprint used to construct objects of that type. Class members Class members are things that belong to a class including methods (static and nonstatic), variables (static and nonstatic), and nested classes (static and nonstatic). Class members can have any of the four access control levels (public, protected, default (package), and private).
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Class methods A class method, often referred to as a static method, may be accessed directly from a class, without instantiating the class first. Class variable See static variable.
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Collection A collection is an object used to store other objects. Collections are also commonly referred to as containers. Two common examples of collections are HashMap and ArrayList. Collection interface The collection interface defines the public interface that is common to Set and List collection classes. Map classes (such as HashMap and Hashtable) do not implement Collection, but are still considered part of the collection framework. Collection framework Three elements (interfaces, implementations, and algorithms) create what is known as the collection framework, and include Sets (which contain no duplicates), Lists (which can be accessed by an index position), and Maps (which can be accessed by a unique identifier). Comparison operators Comparison operators perform a comparison on two parameters and return a boolean value indicating if the comparison is true. For example, the comparison 2<4 will result in true while the comparison 4==7 will result in false. Constructor A method-like block of code that is called when the object is created (instantiated) Typically, constructors initialize data members and acquire whatever resources the object may require. It is the code that runs before the object can be referenced. continue statement The continue statement causes the current iteration of the innermost loop to cease and the next iteration of the same loop to start if the condition of the loop is met. In the case of using a continue statement with a for loop, you need to consider the effects that the continue has on the loop iterator (the iteration expression will run immediately after the continue statement.)
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Deadlock Also called deadly embrace. Threads sometimes block while waiting to get a lock. It is easy to get into a situation where one thread has a lock and wants another lock that is currently owned by another thread that wants the first lock. Deadlock is one of those problems that are difficult to cure, especially because things just stop happening and there are no friendly exception stack traces to study. They might be difficult, or even impossible, to replicate because they always depend on what many threads may be doing at a particular moment in time. Deadly embrace See Deadlock.
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Decision statement The if and switch statements are commonly referred to as decision statements. When you use decision statements in your program, you are asking the program to calculate a given expression to determine which course of action is required. Declaration A declaration is a statement that declares a class, interface, method, package, or variable in a source file. A declaration can also explicitly initialize a variable by giving it a value. Default access A class with default access needs no modifier preceding it in the declaration. Default access allows other classes within the same package to have visibility to this class. Derived class A derived class is a class that extends another class. If class D extends class B, then class D derives from class B and is a derived class. do-while loop The do-while loop is slightly different from the while statement in that the program execution cycle will always enter the body of a do-while at least once. It does adhere to the rule that you do not need brackets around the body if it contains only one statement. Encapsulation Encapsulation is the process of grouping methods and data together and hiding them behind a public interface. A class demonstrates good encapsulation by protecting variables with private or protected access, while providing more publicly accessible setter and/or getter methods.
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