Below is a summary of the principle characteristic of the access and non-access modifiers.

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final:

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• Prevents a method from being overridden.
• A final argument cannot be overridden.

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abstract:

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• Has no method body.Ends in semicolon and not {}
• NEVER used with final, private, static
• Only abstract classes or interfaces can contain abstract methods.
• An abstract class can have non-abstract methods also it can have zero abstract methods.
• All abstract methods must be implemented by subclasses unless the subclass is abstract.
• Concrete class must implement all abstract methods.

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synchronized:

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• Only applies to methods.
• The method can be accessed by only one thread at a time.
• Can be used with public, private, protected and package default

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native:

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• Only applies to methods.
• The method is implemented in platform-dependant code.
• Has no code and ends with a semicolon.

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strictfp:

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• Forces floating points to adhere to the IEEE754 standard.
• Method can be strictfp even if class is not.

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transient:

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• The JVM will skp this variable when serialising an object.
• Applies only to instance variables.

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Volatile:

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• Applies only to instance variables.