{"id":14222,"date":"2018-04-21T06:18:40","date_gmt":"2018-04-21T06:18:40","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=14222"},"modified":"2026-05-07T12:52:48","modified_gmt":"2026-05-07T07:22:48","slug":"literals-in-java","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/literals-in-java\/","title":{"rendered":"Literals in Java – Integral, Floating-Point, Char, String, Boolean"},"content":{"rendered":"

Literals are an integral part of a Java programmer\u2019s day-to-day life. This is a concept that every programmer must know before beginning their journey into the world of Java programming. In this article, we will take a look at literals and their types, and also a few rules that we need to follow while writing and declaring a literal.<\/p>\n

What are Literals in Java?<\/h3>\n

Literals have a constant value and a fixed data type and are often known as constants in Java. Generally, Literals are assigned to a variable to provide a value to the variable.<\/p>\n

Let’s see, an example of assigning a literal to a variable is:<\/p>\n

int age = 21;<\/pre>\n
In the above code snippet, int is the datatype, age is the variable name, and 21 is the literal. Hence, we can say that the literal is providing the variable with a value of 21.<\/p>\n
\"what<\/a><\/p>\n
Types of Literals in Java<\/h3>\n
Generally, 5 types of literals can be further expanded into various other literals. Hence, we will take a look at them vividly in this section.<\/p>\n
The five main types of Literals in Java are:<\/strong><\/p>\n
    \n
  • Integer Literal<\/li>\n
  • Float\/Double Literal<\/li>\n
  • Character Literal<\/li>\n
  • Boolean Literal<\/li>\n
  • String Literal<\/li>\n<\/ul>\n
    Integer Literal in Java<\/h4>\n
    Integer literals are basically a number sequence that doesn\u2019t contain any decimal point in between them.<\/p>\n
    There are four types of Integer Literals:<\/strong><\/p>\n
    1. Decimal Integer<\/h5>\n
    They are integers having a base value of 10; i.e, containing values between 0 to 9. Therefore, it can be a positive value(+) or a negative value(-) but it cannot contain any point in between them. Example: 1000, 1234, +78, -82, etc.<\/p>\n
    int decimal_int=1234;<\/pre>\n
    2. Octal Integer<\/h5>\n
    They are integers having a base value of 8; i.e, containing values between 0 to 7. Therefore, all octal numbers must start with a 0. Example: 012, 077,075, etc.<\/p>\n
    int octal_int=077;<\/pre>\n
    3. Hexadecimal Integer<\/h5>\n
    They are integers having a base value of 16; i.e, containing values between 0 to 15. It is a special type of integer that contains both digits as well as characters. Thus, the digits range from 0 to 9, and the numbers 10 to 15 are replaced by characters a to f. However, any integer starting with 0x or 0X is considered to be a hexadecimal integer. Example: 0xff, 0x2a, 0xf1f2, etc.<\/p>\n
    int hexadec_int=0x1ff2;<\/pre>\n
    4. Binary Integer<\/h5>\n
    They are integers with a base value of 2; i.e; contains only two digits, 0 and 1. However, Binary integers start with a 0b indicating that it is a binary digit. Example: 0b100101, 0b1010101, etc.<\/p>\n
    int binary_int=0b1010101;\r\n<\/pre>\n
    Note: Binary literals can be created only on Java SE 7 and above.<\/p>\n
    Program Showing all the integer literals:<\/strong><\/p>\n
    package com.DataFlair.Literals;\r\npublic class Literals_Integers\r\n{\r\n    public void main()\r\n    {\r\n        int decimal_int=1234;\r\n        int octal_int=077;\r\n        int hexadec_int=0x1ff2;\r\n        int binary_int=0b1010101;\r\n        System.out.println(\"This is a Decimal Literal: \"+decimal_int);\r\n        System.out.println(\"This is an Octal Literal: \"+octal_int);\r\n        System.out.println(\"This is a Hexa Decimal Literal: \"+hexadec_int);\r\n        System.out.println(\"This is a Binary Literal: \"+binary_int);\r\n    }\r\n}\r\n<\/pre>\n
    The output of the above code:<\/strong><\/p>\n
    This is a Decimal Literal: 1234
    \nThis is an Octal Literal: 63
    \nThis is a Hexa Decimal Literal: 8178
    \nThis is a Binary Literal: 85<\/div>\n
    Floating Point Literals in Java<\/h4>\n
    Floating-point literals are values that contain a decimal point between them. Floating-point literals are generally of the double data type by default. Also, we can assign them to float data types by adding an f at the end of the value.<\/p>\n
    Example of declaring a float literal in Java:<\/strong><\/p>\n
    float val_float=1.7732f;<\/pre>\n
    Example of declaring a double literal:<\/strong><\/p>\n
    float val_double=1.7732; \/\/By default the compiler assigns double datatype.\r\nfloat val_double=1.7732d;\r\ndouble val_double=1.7732;\r\n<\/pre>\n
    Floating-point Literals can also have an exponent part. This exponential part can be declared as follows:
    \n123E-45f<\/p>\n
    A few points to remember while declaring floating-point literals are:
    \n1. If no suffix is present, the default data type is double.
    \n2. F or f suffix represents a floating data type.
    \n3. D or d suffix represents a double data type.<\/p>\n
    Few legal and illegal floating literals:<\/p>\n
      \n
    • 123.45\/\/Legal<\/li>\n
    • 122.32E5\/\/Legal<\/li>\n
    • 231.12F\/\/Legal<\/li>\n
    • 1\/4 \/\/ Illegal Symbol Used \u201c\/\u201d<\/li>\n
    • 1.7.5 \/\/Illegal, as two decimal points are used.<\/li>\n
    • 1,234.56\/\/ Illegal, as commas are not allowed<\/li>\n
    • 123.E4\/\/Illegal, as E cannot precede the point.<\/li>\n
    • 321E\/\/Illegal, as the exponent part is incomplete.<\/li>\n<\/ul>\n
      Also, floating-point literals cannot have commas in between the digits.<\/p>\n
      Program Showing all the floating literals:<\/strong><\/p>\n
      package com.DataFlair.Literals;\r\npublic class Literals_Float\r\n{\r\n    public void main()\r\n    {\r\n        float val_float=1.7732f;\r\n        double val_double=1.7732d;\r\n        float val_exponent=123E4f;\r\n        System.out.println(\"This is a Floating Point Literal\"+val_float);\r\n        System.out.println(\"This is a Decimal Literal\"+val_double);\r\n        System.out.println(\"This is an Exponential Literal\"+val_exponent);\r\n    }\r\n}\r\n<\/pre>\n
      The output of the above code:<\/strong><\/p>\n
      This is a Floating Point Literal1.7732
      \nThis is a Decimal Literal1.7732
      \nThis is an Exponential Literal1230000.0<\/div>\n
      Boolean Literal in Java<\/h4>\n
      A boolean literal is a literal that contains only two values, true and false. It is declared using the keyword boolean. Although it is a very useful literal to declare flag variables in different programs to terminate a looping sequence.<\/p>\n
      Program showing the Boolean Literals:<\/strong><\/p>\n
      package com.DataFlair.Literals;\r\npublic class Literals_boolean\r\n{\r\n    public void main()\r\n    {\r\n        boolean flag1=true;\r\n        boolean flag2=false;\r\n        System.out.println(\"This is a boolean true flag variable\"+flag1);\r\n        System.out.println(\"This is a boolean false flag variable\"+flag2);\r\n    }\r\n}<\/pre>\n
      The output of the above code:<\/strong><\/p>\n
      This is a boolean true flag variabletrue
      \nThis is a boolean false flag variablefalse<\/div>\n
      String Literals in Java<\/h4>\n
      A string is basically an array of characters. In Java, we have a special class for strings that allows users to implement strings in a program very easily. As a result, Anything written inside a double quote (\u201c \u201d) is a string.<\/p>\n
      Example of Java String Literal:<\/strong><\/p>\n
      String Company = \u201cDataFlair\u201d;\/\/Valid String Literal\r\nString Company = DataFlair;\/\/Invalid as there is no double quote.<\/pre>\n
      Null Literal in Java<\/h4>\n
      Strings in Java can also be declared void with a special literal known as a null literal. Moreover, it is basically equivalent to an integer value of 0.<\/p>\n
      Program showing implementation of String Literal:<\/strong><\/p>\n
      package com.DataFlair.Literals;\r\npublic class Literals_string\r\n{\r\n    public void main()\r\n    {\r\n    String company=\"DataFlair\";\r\n    String null_Literal=null;\r\n    System.out.println(\"This is a String Literal: \"+company);\r\n    System.out.println(\"This is a null Literal: \"+null_Literal);\r\n   }\r\n}\r\n<\/pre>\n
      The output of the above code:<\/strong><\/p>\n
      This is a String Literal: DataFlair
      \nThis is a null Literal: null<\/div>\n
      Character Literals in Java<\/h4>\n
      Character Literals in Java are represented with a single quote. Therefore, the general difference between a string literal and a character literal is that a character literal contains only one character, whereas a string literal contains a set of characters.<\/p>\n
      A character literal can be represented in four ways:<\/p>\n
      1. Single quote character<\/strong><\/p>\n
      In this, a single character is represented by being enclosed in a pair of single quotes (\u2018 \u2019).<\/p>\n
      Example of single quote character in Java:<\/strong><\/p>\n
      char ch = \u2018A\u2019;\r\n<\/pre>\n
      2. Character Literal as an Integer Literal<\/strong><\/p>\n
      In Java, each character has a numeric value assigned to it. By using those integer values, as a result, we can display the characters. Let\u2019s see with an example given below.<\/p>\n
      Example of character literal as integral literal in Java:<\/strong><\/p>\n
      char number = 0065;<\/pre>\n
      3. Unicode representation of character Literal<\/strong><\/p>\n
      We can also represent the character literals using Unicode. Hence, Unicode is a special code assigned to the character, usually represented by \u2018\/u\u2019 with a hexadecimal digit.<\/p>\n
      Example of the Unicode representation of a character literal in Java:<\/strong><\/p>\n
      char uni = \u2018\\u0065\u2019;<\/pre>\n
      4. Escape Sequence in Java<\/strong><\/p>\n
      It is a special kind of character literal which is preceded by a \\. Also, every escape sequence has a special feature. Some of the most used escape sequences are:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      Escape Sequence\u00a0<\/b><\/td>\nFunctionality<\/b><\/td>\n<\/tr>\n
      \\n<\/span><\/td>\nUsed to insert a new line.<\/span><\/td>\n<\/tr>\n
      \\t<\/span><\/td>\nUsed to insert a horizontal tab.<\/span><\/td>\n<\/tr>\n
      \\b<\/span><\/td>\nUsed to insert a blank space.<\/span><\/td>\n<\/tr>\n
      \\v<\/span><\/td>\nUsed to insert a Vertical tab.<\/span><\/td>\n<\/tr>\n
      \\a<\/span><\/td>\nUsed to add a small beep sound.<\/span><\/td>\n<\/tr>\n
      \\\u2019<\/span><\/td>\nUsed to add a single quote inside a string.<\/span><\/td>\n<\/tr>\n
       \\\u201d<\/span><\/td>\nUsed to add double quotes inside a String.<\/span><\/td>\n<\/tr>\n
      \\\\<\/span><\/td>\nUsed to add a backslash<\/span><\/td>\n<\/tr>\n
      \\r<\/span><\/td>\nUsed for carriage return.<\/span><\/td>\n<\/tr>\n
      \\?<\/span><\/td>\nUsed to add a Question mark<\/span><\/td>\n<\/tr>\n
      \\0n<\/span><\/td>\nUsed to represent an octal number<\/span><\/td>\n<\/tr>\n
      \\xHn<\/span><\/td>\nUsed to represent a hexadecimal number<\/span><\/td>\n<\/tr>\n
      \\uHn<\/span><\/td>\nUsed to represent a Unicode character through its hex code.<\/span><\/td>\n<\/tr>\n
      \\0<\/span><\/td>\nNull Character<\/span><\/td>\n<\/tr>\n
      \\f<\/span><\/td>\nUsed to represent formfeed<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      Few Valid Character Literals:<\/strong><\/p>\n
      char ch = \u2018A\u2019;\r\nchar ch =\u2019\\u0065\u2019\r\nchar ch= 0065\r\nchar ch=\u2019\\\\\u2019\r\nchar ch=\u2019%\u2019\r\n<\/pre>\n
      Program implementing Character Literal<\/strong><\/p>\n
      package com.DataFlair.Literals;\r\npublic class Literal_Char\r\n{\r\n    public void main()\r\n    {\r\n        char ch='A';\r\n        char number= 0065;\r\n        char uni='\\u0065';\r\n        System.out.print(\"\\nThis is a character Literal:\\b\"+ch);\r\n        System.out.print(\"\\nThis is a character Literal as Integer:\\b\"+number);\r\n        System.out.print(\"\\nThis is a character Literal as Unicode:\\b\"+uni);\r\n    }\r\n}\r\n\r\n<\/pre>\n
      The output of the above code:<\/strong><\/p>\n
      This is a character Literal:A
      \nThis is a character Literal as Integer:5
      \nThis is a character Literal as Unicode:e<\/div>\n
      Class literals in Java<\/h4>\n
      There’s also a special kind of literal called a class literal, which is formed by taking a type name and appending “.class” to it; for example, String.class.Therefore, this refers to the object (of type Class) that represents the type itself.<\/p>\n
      Example of a class literal in Java:<\/strong><\/p>\n
      Class<String> c = String.class; \r\n<\/pre>\n
      Rules to Use Underscore in Literals<\/strong><\/p>\n
        \n
      • In the beginning, end, or in between the numbers.<\/li>\n
      • Adjacent to a decimal point in a floating-point literal.<\/li>\n
      • Prior to an F or L suffix.<\/li>\n
      • At positions where a string of digits is expected<\/li>\n<\/ul>\n
        Some invalid use of Underscore<\/strong><\/p>\n
          \n
        • 1_.234<\/li>\n
        • 1._234<\/li>\n
        • 65_<\/li>\n
        • 12_34_56_78_90_L<\/li>\n
        • 0_x77<\/li>\n
        • 0x_77<\/li>\n
        • 0x77_<\/li>\n<\/ul>\n
          Why Use Literals?<\/h3>\n
          Literal is very useful for implementation in the code as it reduces declaring constants and adding labels by doing it on the same line. Additionally, Literals in Java are a way of representing text, characters, and numerical values.<\/p>\n
          How to use Literals in Java?<\/h3>\n
          As we saw earlier, as well in the discussed topics, a literal is declared along with a data type and a variable name. Also, a literal has an = sign before it, which assigns the value of the literal to the variable.<\/p>\n
          Conclusion<\/h3>\n
          In addition, Literals are the basic foundation of programming, and grasping their concept is essential for implementation. Therefore, without literals, creating a program is next to impossible. Also, we have talked about different literals and their uses, and how to implement them in our code.<\/p>\n","protected":false},"excerpt":{"rendered":"
          Literals are an integral part of a Java programmer\u2019s day-to-day life. This is a concept that every programmer must know before beginning their journey into the world of Java programming. In this article, we...<\/p>\n","protected":false},"author":5,"featured_media":108852,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[1989,2161,2464,3617,4189,4797,5625,6850,7584,9198,12911,13905,15074,15145],"class_list":["post-14222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-binary-literals","tag-boolean-literals-in-java","tag-char-literals-in-java","tag-decimal-literals","tag-escape-sequence","tag-floating-point-literals-in-java","tag-hexa-decimal-literals","tag-integral-literals","tag-java-literals","tag-octal-literals","tag-single-quote","tag-string-literals-in-java","tag-types-of-java-literals","tag-unicode-representation"],"yoast_head":"\nLiterals in Java - Integral, Floating-Point, Char, String, Boolean - DataFlair<\/title>\n<meta name=\"description\" content=\"Literals in Java hold the value of variables. 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