Strings
- 1. Thursday, October 9, 2014 Strings! Computer Science - Concatenation–a series of interconnected things or events. "a singular concatenation of events unlikely to recur" synonyms: series, sequence, succession, chain! - First and foremost is concatenation. We use the plus sign, +, to do this. For example:! String mm = "Hello";! String nx = "good buddy";! String c = mm + nx;! System.out.println(c); //prints Hellogood buddy…notice no space between o & g! - The above code could also have been done in the following way:! String mm = "Hello";! String nx = "good buddy";! System.out.println(mm + " " + nx); //prints Hello good buddy…notice the space! - We could also do it this way:! System.out.println("Hello" ! - length( ) method, find the number of characters in a String! int len = theName.length( );! System.out.println(len); //space is counted! - Pick out a piece of a String…substring! String myPet = "Sparky the dog";! String smallPart = myPet.substring(4);! System.out.println(smallPart); //prints ky the dog S P A R K Y T H E D O G 0 1 2 3 4 5 6 7 8 9 10 11 12 13 1
- 2. Thursday, October 9, 2014 string smallPar = myPet.substring(4, 12);! System.out.println(smallPart); //prints ky the d! - toLowerCase converts all characters to lower case! String bismark = "Dude, where's MY car?"! System.out.println( bismark toLowerCase( ) ); //prints dude, where's my car?! - toUpperCase converts all characters to upper case! System.out.println( "Dude, where's My car? toUpperCase( ) );! //prints DUDE, WHERE'S MY CAR?! - Note: length, substring, toLowerCase, and toUpperCase are all methods of the String class.! - It is possible to concatenate a String with a numeric variable as follows:! int x = 27! String s = "Was haben wir gemacht?"; //German for "What have we done?"! String combo = s + " " + x;! System.out.println(combo); //prints Was haben wir gimacht? 27! - How do we force a quote character (") to printout.... or, to be part of a String. Use the escape sequence, ", to print the following (note escape sequences always start with the character.! - What "is" the right way? String s = "What "is" the right way?"! - Another escape sequence, n, will create a new line (also called line break) as shown below:! String s = "Here is one linenand here is another";! System.out.println(s)! - The escape sequence, , will allow us to print a backslash within our String. Otherwise, if we try to insert just a single it will be interpreted as the beginning of an escape sequence.! System.out.println("Path = c:nerd_file.doc")! 2
- 3. Thursday, October 9, 2014 - Prints the following:! Path = c:nerd_file.doc - The escape sequence, t, will allow us to "tab" over. The following code tabs twice. 3