In this chapter, we will discuss Scala String in Detail. After this, you will be able to create a string in Scala. Moreover, we will learn how to create a format string and concatenate strings in Scala.<\/p>\n
So, let’s start the Scala String Tutorial.<\/p>\n
An immutable object, a string in Scala is a sequence of characters. Once we declare it, we cannot modify it. The following is a Scala string:
\n\u201cAyushi\u201d<\/p>\n
To define a string, we can use a \u2018var\u2019 or a \u2018val\u2019. When we use \u2018var\u2019, we can reassign to it. This isn\u2019t the same with \u2018val\u2019:<\/p>\n
scala> var word=\"rest\"\r\nword: String = rest\r\nscala> word=\"reset\"\r\nword: String = reset<\/pre>\nBy the way, reassigning \u2018word\u2019 to an Int will cause an error:<\/p>\n
scala> word=7\r\n<console>:12: error: type mismatch;\r\nfound : Int(7)\r\nrequired: String\r\n word=7\r\n ^<\/pre>\nNow with \u2018val\u2019:<\/p>\n
scala> val word=\"rest\"\r\nword: String = rest\r\nscala> word=\"reset\"\r\n<console>:12: error: reassignment to val\r\n word=\"reset\"<\/pre>\nWe can also mention the data type if we don\u2019t want to rely on type inference.<\/p>\n
scala> var word:String=\"rest\"\r\nword: String = rest\r\nscala> word=\"reset\"\r\nword: String = reset<\/pre>\nTo make a lot of changes in your Scala string, you can use the StringBuilder class instead.<\/p>\n
Find Length of a Scala String<\/h3>\n
An accessor method is one that\u2019ll tell us about an object. One such method for strings is length(). It returns the number of characters a string holds. In the previous example,<\/p>\n
scala> word.length()\r\nres0: Int = 5<\/pre>\nHere are more than a couple more examples:<\/p>\n
scala> \"Ayushi\".length()\r\nres1: Int = 6\r\nscala> \"\".length()\r\nres2: Int = 0\r\nscala> \" \".length()\r\nres3: Int = 1<\/pre>\nConcatenating Scala Strings<\/h3>\n
Concatenating two strings in Scala means joining the second to the end of the first. For this, we have the method concat() in the String class:<\/p>\n
scala> \"ab\".concat(\"cde\")\r\nres5: String = abcde<\/pre>\nLet\u2019s try using more than one:<\/p>\n
scala> \"Ayushi\".concat(\" \".concat(\"Sharma\"))\r\nres6: String = Ayushi Sharma<\/pre>\nWe could also have done this using the + operator:<\/p>\n
scala> \"Ayushi\"+\" \"+\"Sharma\"\r\nres7: String = Ayushi Sharma<\/pre>\nCreating Format Strings in Scala<\/h3>\n
For the times we want to format numbers\/values into our string, we can make use of one of the methods printf() and format(). Other than this, the class String has the method format() to return a String object instead of a PrintStream object.<\/p>\n
scala> var (a:Int,b:Int,c:Int)=(7,8,9)\r\na: Int = 7\r\nb: Int = 8\r\nc: Int = 9\r\nscala> printf(\"a=%d, b=%d, c=%d\",a,b,c)<\/pre>\na=7, b=8, c=9
\nFor Integer data, we used %d. For Float and String data, we use %f and %s, respectively.<\/p>\nConclusion<\/h3>\n
Hence, we studied how to create Scala String and creating format string in Scala. Along with this, we learned to concatenate and find a length\u00a0of string. Still, have a confusion, feel free to ask in the comment session.<\/p>\n