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Java Basics

Checked and Unchecked Exceptions example

In this example we shall show you how to use a checked and an unchecked exception. A checked exception is anything that is a subclass of Exception, except for RuntimeException and its subclasses. In order to use a checked and an unchecked exception we have followed the steps below: We have created a method, void checkSize(String fileName) that creates a ...

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Java Generics Examples

1. Introduction Sun Microsystems included Java Generics in java 1.5 to introduce the type-safety feature while using the collection classes. It also complements auto-boxing, auto-unboxing, bounded variables, covariance, etc. There are other benefits of Generics. We will uncover each. 2. What is Java Generics Java Generics is a technical term denoting a set of language features related to the definition and ...

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Static Variable Java Example

1. Introduction This is a static variable Java Example. Static variables are declared with the static word before the type of variable. The main difference among regular variables is that static variables are not bounded by any object instances, and are shared among all instances. static datatype Variable //static variable example static int count = 0; 2. Simple Static Variable ...

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short

In this example we shall show you how to use a short type in Java. The short data type is a 16-bit signed two’s complement integer. It has a minimum value of -32,768 and a maximum value of 32,767 (inclusive).  To create a variable of short type you can just use the short keyword in the variable, as described in the code ...

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long

With this example we are going to demonstrate how to use a long type in Java. The long data type is a 64-bit signed two’s complement integer. It has a minimum value of -9,223,372,036,854,775,808 and a maximum value of 9,223,372,036,854,775,807 (inclusive). Use this data type when you need a range of values wider than those provided by int. In short, ...

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int

This is an example of how to use an int type in Java. The int data type is a 32-bit signed two’s complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147,483,647 (inclusive). For integral values, this data type is generally the default choice unless there is a reason to choose something else. This data ...

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float

In this example we shall show you how to use a float type in Java. The float data type is a single-precision 32-bit IEEE 754 floating point. Use a float (instead of double) if you need to save memory in large arrays of floating point numbers. This data type should never be used for precise values, such as currency. For that, ...

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double

With this example we are going to demonstrate how to use a double type in Java. The double data type is a double-precision 64-bit IEEE 754 floating point. For decimal values, this data type is generally the default choice. This data type should never be used for precise values, such as currency. In short, to create a variable of double ...

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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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