Supertype and Subtype

This section describes the supertype-subtype relationships: a supertype corresponds a class or interface that is extended or implemented directly or indirectly by the class or interface of the subtype.

Based on Class and Interface hierarchical relationships, Java class and interface reference types are related to each other with supertype-subtype relationships.

Using the class interface hierarchy example presented in the previous section, the supertype-subtype relationship can be illustrated in the picture below:
Java Class Interface Type Hierarchy

Based on the picture, we can say:

Last update: 2014.

Table of Contents

 About This Book

 Installing JDK 1.8 on Windows

 Execution Process, Entry Point, Input and Output

 Primitive Data Types and Literals

 Bits, Bytes, Bitwise and Shift Operations

 Managing Bit Strings in Byte Arrays

Reference Data Types and Variables

 Reference Types Supported in Java

 Creating Class Type Objects

 Class Type Variables Storing References

 Interface Type Variables

 Class and Interface Hierarchy

Supertype and Subtype

 Explicit and Implicit Type Casting

 Type Casting Example Program

 Type Casting Compile and Runtime Error

 StringBuffer - The String Buffer Class

 System Properties and Runtime Object Methods

 Generic Classes and Parameterized Types

 Generic Methods and Type Inference

 Lambda Expressions and Method References

 Execution Threads and Multi-Threading Java Programs

 ThreadGroup Class and "system" ThreadGroup Tree

 Synchronization Technique and Synchronized Code Blocks

 Deadlock Condition Example Programs

 Garbage Collection and the gc() Method

 Outdated Tutorials


 PDF Printing Version