Parametric polymorphism stipulates that within a class declaration, a field name can associate with different types and a method name can associate with different parameter and return types.Also, multiple methods having the same name can appear in a class (through declaration and/or inheritance). For example, you might use + to perform integer addition, floating-point addition, or string concatenation, depending on the types of its operands. Overloading refers to using the same operator symbol or method name in different contexts.The compiler coerces the subclass type to the superclass type to restrict operations to those of the superclass. (There is no division operation that supports an integer operand and a floating-point operand.) Another example is passing a subclass object reference to a method's superclass parameter. If one operand is an integer and the other operand is a floating-point value, the compiler coerces (implicitly converts) the integer to a floating-point value to prevent a type error. For example, you divide an integer by another integer or a floating-point value by another floating-point value. Coercion is an operation that serves multiple types through implicit-type conversion.
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