Data types are different sizes and values that can be stored in the variable that is made as per convenience and circumstances to cover up all test cases. Also, let us cover up other important ailments that there are majorly two types of languages that are as follows: Show
Java is statically typed and also a strongly typed language because, in Java, each type of data (such as integer, character, hexadecimal, packed decimal, and so forth) is predefined as part of the programming language and all constants or variables defined for a given program must be described with one of the data types. Java has two categories in which data types are segregated
Types Of Primitive Data TypesPrimitive data are only single values and have no special capabilities. There are 8 primitive data types. They are depicted below in tabular format below as follows: Let us discuss and implement each one of the following data types that are as follows: Type 1: booleanBoolean data type represents only one bit of information either true or false which is intended to represent the two truth values of logic and Boolean algebra, but the size of the boolean data type is virtual machine-dependent. Values of type boolean are not converted implicitly or explicitly (with casts) to any other type. But the programmer can easily write conversion code. Syntax: boolean booleanVar; Size: Virtual machine dependent Values: Boolean such as true, false Default Value: false Example: Java
Output Hi Geek Hello Geek Type 2: byteThe byte data type is an 8-bit signed two’s complement integer. The byte data type is useful for saving memory in large arrays. Syntax: byte byteVar; Size: 1 byte (8 bits) Values: -128 to 127 Default Value: 0 Example: Java
Type 3: shortThe short data type is a 16-bit signed two’s complement integer. Similar to byte, use a short to save memory in large arrays, in situations where the memory savings actually matters. Syntax: short shortVar; Size: 2 byte (16 bits) Values: -32, 768 to 32, 767 (inclusive) Default Value: 0 Type 4: intIt is a 32-bit signed two’s complement integer. Syntax: int intVar; Size: 4 byte ( 32 bits ) Values: -2, 147, 483, 648 to 2, 147, 483, 647 (inclusive)
Type 5: longThe range of a long is quite large. The long data type is a 64-bit two’s complement integer and is useful for those occasions where an int type is not large enough to hold the desired value. Syntax: long longVar; Size: 8 byte (64 bits) Values: {-9, 223, 372, 036, 854, 775, 808} to {9, 223, 372, 036, 854, 775, 807} (inclusive)
Type 6: floatThe 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. Syntax: float floatVar; Size: 4 byte (32 bits) Values: upto 7 decimal digits
Example: Java
If we uncomment lines no 14,15,16 then the output would have been totally different as we would have faced an error. Type 7: doubleThe double data type is a double-precision 64-bit IEEE 754 floating-point. For decimal values, this data type is generally the default choice. Syntax: double doubleVar; Size: 8 bytes or 64 bits Values: Upto 16 decimal digits
It is recommended to go through rounding off errors in java. Type 8: charThe char data type is a single 16-bit Unicode character. Syntax: char charVar; Size: 2 byte (16 bits) Values: ‘\u0000’ (0) to ‘\uffff’ (65535)
You must be wondering why is the size of char 2 bytes in Java? So, in other languages like C/C++ uses only ASCII characters, and to represent all ASCII characters 8-bits is enough. But java uses the Unicode system not the ASCII code system and to represent the Unicode system 8 bits is not enough to represent all characters so java uses 2 bytes for characters. Unicode defines a fully international character set that can represent most of the world’s written languages. It is a unification of dozens of character sets, such as Latin, Greeks, Cyrillic, Katakana, Arabic, and many more. Example: Java
Output char: G integer: 89 byte: 4 short: 56 float: 4.7333436 double: 4.355453532 long: 12121 Non-Primitive Data Type or Reference Data TypesThe Reference Data Types will contain a memory address of variable values because the reference types won’t store the variable value directly in memory. They are strings, objects, arrays, etc. A: StringsStrings are defined as an array of characters. The difference between a character array and a string in Java is, that the string is designed to hold a sequence of characters in a single variable whereas, a character array is a collection of separate char type entities. Unlike C/C++, Java strings are not terminated with a null character. Syntax: Declaring a string <String_Type> <string_variable> = “<sequence_of_string>”; Example: // Declare String without using new operator String s = "GeeksforGeeks"; // Declare String using new operator String s1 = new String("GeeksforGeeks"); B: ClassA class is a user-defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one type. In general, class declarations can include these components, in order:
C: ObjectIt is a basic unit of Object-Oriented Programming and represents real-life entities. A typical Java program creates many objects, which as you know, interact by invoking methods. An object consists of :
D: InterfaceLike a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body).
E: ArrayAn array is a group of like-typed variables that are referred to by a common name. Arrays in Java work differently than they do in C/C++. The following are some important points about Java arrays.
Check Out: Quiz on Data Type in Java This article is contributed by Shubham Agrawal. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to . See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. When a method returns an array reference you include ____ with the return type in the method header A B C D?When returning an array reference, square brackets are included with the return type in the method header.
When you place objects in order beginning with the object that has the lowest value you are sorting in?For example, ordering a set of numbers from greatest to smallest value means that you're arranging them in descending order. Say you have the following numbers: 49, 80, 56, 11, 20 . Sorting them in descending order would look like this: 80, 56, 49, 20, 11 .
Is a class for storing and manipulating changeable data that is composed of multiple characters?String. -- A class for working with immutable (unchanging) data composed of multiple characters. StringBuffer. --A class for storing and manipulating mutable data composed of multiple characters.
When you create parent and child classes of your own the child classes use ____ constructors?When you instantiate any object, you call its constructor and the Objects constructor and when you create parent and child classes of your own, the child classes use three constructors.
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