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Static and Method Overloading

Static and Method Overloading. static. One per class, not per object static variables all instances of the class share the same static variable example: serial/VIN number for Car static methods invoked through class name, not object name cannot reference instance variables

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Static and Method Overloading

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  1. Static and Method Overloading

  2. static • One per class, not per object • static variables • all instances of the class share the same static variable • example: serial/VIN number for Car • static methods • invoked through class name, not object name • cannot reference instance variables • example: Math methods, isleap, ConvertTemperature

  3. Method Overloading • Method signature – name of method and type and order of parameters • Two methods must have different signatures, but may have the same name • println(String s) • println(int i) • A class may have multiple constructors with different parameter lists

  4. Examples • Student • Constructor 1 takes first name, last name • Constructor 2 takes first name, last name, grade • StudentDB • addStudent(Student s) • addStudent(String fname, String lname)

  5. Aggregation • “Has-a” relationship • An object can have references to other objects • Example: • ContactInfo – Name, Address, Phone • Employee “has-a” ContactInfo

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