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Keyword
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Purpose
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boolean
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declares a boolean variable or return type
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byte
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declares a byte variable or return type
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char
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declares a character variable or return type
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double
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declares a double variable or return type
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float
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declares a floating point variable or return type
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short
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declares a short integer variable or return type
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void
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declare that a method does not return a value
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int
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declares an integer variable or return type
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long
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declares a long integer variable or return type
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while
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begins a while loop
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for
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begins a for loop
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do
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begins a do while loop
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switch
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tests for the truth of various possible cases
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break
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prematurely exits a loop
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continue
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prematurely return to the beginning of a loop
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case
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one case in a switch statement
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default
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default action for a switch statement
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if
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execute statements if the condition is true
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else
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signals the code to be executed if an if statement is not true
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try
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attempt an operation that may throw an exception
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catch
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handle an exception
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finally
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declares a block of code guaranteed to be executed
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class
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signals the beginning of a class definition
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abstract
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declares that a class or method is abstract
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extends
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specifies the class which this class is a subclass of
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final
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declares that a class may not be subclassed or that a field or method may not be overridden
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implements
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declares that this class implements the given interface
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import
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permit access to a class or group of classes in a package
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instanceof
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tests whether an object is an instanceof a class
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interface
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signals the beginning of an interface definition
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native
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declares that a method is implemented in native code
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new
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allocates a new object
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package
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defines the package in which this source code file belongs
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private
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declares a method or member variable to be private
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protected
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declares a class, method or member variable to be protected
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public
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declares a class, method or member variable to be public
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return
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returns a value from a method
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static
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declares that a field or a method belongs to a class rather than an object
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super
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a reference to the parent of the current object
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synchronized
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Indicates that a section of code is not thread-safe
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this
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a reference to the current object
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throw
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throw an exception
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throws
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declares the exceptions thrown by a method
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transient
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This field should not be serialized
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volatile
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Warns the compiler that a variable changes asynchronously
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