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When you have finished this chapter you will know the following:
The difference between a variable and identifier, and why this distinction matters, particularly in Java
What a data type is and how data type mismatch between identifiers and variables can cause program errors
How Java makes sure primitive data types are safe
How Java stores runtime data types with tags and why these tags are useful
How Java can manage memory to ensure it is correctly used
What a container class is and how it can be used
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