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Reference types in Java.

Reference types all inherit from Object (the java.lang.Object class)

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List

• Classes,
• enums,
• arrays,
• and interfaces

Example

Examples of reference types include:

• java.lang.String,
• all of the wrapper classes for primitive types such as java.lang.Double,
• the interface java.io.Serializable,
• and the enum javax.swing.SortOrder.