Basic HTML version of Foils prepared 19 July 97

Foil 20 API of a Class

From Java Tutorial - Summer 1997 Part II: Java Language and Object-Oriented Concepts CEWES Tutorial -- July 22-25 1997. by Nancy J. McCracken,Geoffrey C. Fox
Sun API links for Foil 20
Each class has an API (Application Programming Interface) consisting of all the variables and methods that other programmers (i.e. in other classes) are allowed to use. These are designated by the "public" keyword.
Example showing part of the Java Date class:
  • public class Date
  • { // Constructor methods to create instances of class
    • public Date();
    • public Date(int year, int month, int day);
  • // Accessor and Mutator methods to access and change data
    • public int getHours();
    • public int getYear();
    • . . .
    • public void setHours();
    • public void setYear();
    • . . .
  • // Other public methods
    • public boolean after(Date when);
    • . . . }
The on-line Java Hierarchy and Index shows the API's of all Java classes.

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