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char

This is an example of how to use a char type in Java. The char data type is a single 16-bit Unicode character. It has a minimum value of ‘\u0000’ (or 0) and a maximum value of ‘\uffff’ (or 65,535 inclusive). In order to create variable of char type you should type the char keyword in a variable. Let’s take ...

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byte

In this example we shall show you how to use a byte type in Java. The byte data type is an 8-bit signed two’s complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive). The byte data type can be useful for saving memory in large arrays, where the memory savings actually matters. They ...

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boolean

With this example we are going to demonstrate how to use a boolean type in Java. The boolean data type has only two possible values: true and false. Use this data type for simple flags that track true/false conditions. This data type represents one bit of information, but its “size” isn’t something that’s precisely defined. In short, to create variable ...

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Using an enum as a state machine

In this short example, a parser state machine processes raw XML from a ByteBuffer. Each state has its own process method and if there is not enough data available, the state machine can return to retrieve more data. Each transition between states is well defined and the code for all states is together in one enum. interface Context { ByteBuffer ...

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Each Enum Instance a different sub-class

In this example we shall show you how to have each enum instance represent a different sub-class. To make each enum instance represent a different sub-class one should perform the following steps: Create an enum with different enum constants. Give each enum constant a different behavior for some method. Declare the method abstract in the enum type and override it with ...

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Enum to implement an interface

With this example we are going to demonstrate how to use an enum to implement an interface. Implementing an interface with an enum can be useful when we need to implement some business logic that is tightly coupled with a discriminatory property of a given object or class. In short, to implement an interface with an enum you should: Create ...

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Enum for Singleton and Utility class

enum Singleton { INSTANCE; } enum Utility { ; // no instances } Related Article: Java Secret: Using an enum to build a State machine Reference: Java Secret: Using an enum to build a State machine from our JCG partner Peter Lawrey at the Vanilla Java blog

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Modulo Operator

In this example we shall show you how to use the modulo operator. The modulo operator is an arithmetic operator that is used to divide one operand by another and return the remainder as its result. You use the modulo operator to get the remainder of the division between an int variable and 10 and a double variable and 10, as ...

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Arithmetic Operators

With this example we are going to demonstrate how to use the arithmetic operators in Java. The arithmetic operators supported by the Java programming language are the Additive operator (also used for String concatenation), the Subtraction operator, the Multiplication operator, the Division operator, and the Remainder operator. In short, to use the arithmetic operators you should: Use the Additive operator ...

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