Java supports the use of various types of literals, such as integers (5, 2), floating-point numbers (2.5, 6.022e+23), characters ('a', '\n'), Booleans (true, false), and strings ("Hello\n"). Extensive use of literals in a program can lead to two problems: first, the meaning of the literal is often obscured or unclear from the context (magic numbers); second, changing a frequently used literal requires searching the entire program source for that literal and distinguishing those the uses that must be modified from those that should remain unmodified.
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