--The Java Language, An Overview
Java bytecodes are translated on the fly to native machine instructions (interpreted) and not stored anywhere. And since linking is a more incremental and lightweight process, the development process can be much more rapid and exploratory.
As a part of the bytecode stream, more compile-time information is carried over and available at runtime. This is what the linker's type checks are based on. It also makes programs more amenable to debugging.
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