Why does each slot in the local array of variables in the stack frame have 4 bytes rather than 1 byte in the JVM?

Question

Each slot of a local array of variables has 4 bytes. Therefore, one slot is used to store characters, short or byte variables. Means that all smaller data types are internally converted to an int data type.

I doubt:

1). Doesn't that make smaller data types useless if they have 4 bytes inside ?, If yes, why not remove these data types from the language? 2). If each slot has 1 byte, then there will be no memory loss. Why does each slot not have 1 byte?

Answer 1

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Answer 2

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Answer 3

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Answer 4

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And there is no reason to make the variable slot 1-byte, because it will not save a lot of memory (the stack is usually much less than a heap), and the memory works faster if the infinity is supplemented.