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Fun With Strings Example Code

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Java Code:

This program provides some example Java code of how to work with the String class. It shows the use of String Literals, manipulation of Strings, as well as converting them to numbers and back again.

The articles that go with this program code are: The String Class, The String Literal, Comparing Strings and Manipulating Strings.

public class FunWithStrings {

    public static void main(String[] args) {
        
        //Use a string literal to assign a value to the String
        String address = "I live at 22b Baker Street!";
        
        //The same string but using Unicode values
        String unicodeAddress = "\u0049\u0020\u006C\u0069\u0076\u0065"
                + "\u0020\u0061\u0074\u0020\u0032\u0032\u0042\u0020"
                + "\u0042\u0061\u006B\u0065\u0072\u0020\u0053\u0074"
                + "\u0072\u0065\u0065\u0074\u0021";
        
        System.out.println("Here is Sherlock's address: " + address); 
        System.out.println("It even works using Unicode characters: " + unicodeAddress); 
        
        //A char array can be used to make a String
        char characterArray[] = {'C', 'h', 'a','r','a','c','t','e','r','s'};
        String characterString = new String(characterArray);
        
        //or even a byte arrray
        byte byteArray[] = {67,104,97,114,97,99,116,101,114,115};
        String byteString = new String(byteArray);
        
        System.out.println("Char Array: " + characterString);
        System.out.println("Byte Array: " + byteString);
        
                
        //Dealing with unusual characters by using the Unicode value
        String footballPlayer = "Thomas M\u00FCller plays for Germany.";
        System.out.println(footballPlayer);
        
        //Escape sequences for characters
        String speech = "\"I say old chap\", he said to me";
        String backSlashNewLine = "The cat was \\grining\\ from ear to ear. Or"
                            + " here to\n\n\n here.";
        System.out.println(speech);
        System.out.println(backSlashNewLine);
        

        //Looking for Who in The Who
        String bandName = "The Who";
        int index = bandName.indexOf("Who");
        
        System.out.println("I found Who at position " + index);
      
        String newBandName = bandName.substring(0,index);
      
        //The Who is now The Clash
        newBandName = newBandName + "Clash";
        System.out.println("Let's change the band name to " + newBandName);
      
        //Convert a string number to an actual number
        String number = "10";   
        int convertedNumber = Integer.valueOf(number).intValue();
        System.out.println("The number " + convertedNumber);
      
        //Converting to a differnt number type.
        int numberTwenty = 20;
        String converted = Double.toString(numberTwenty);
        System.out.println(converted);
      
        //Time to trim some spaces
        String tooManySpaces = "     Neil Armstrong..   ";
        tooManySpaces = tooManySpaces.trim();


        //lexicographically Apple precedes Pear!
        String firstString = "Apple";
        String secondString = "Pear";

        if (firstString.compareTo(secondString) < 0){

            System.out.println("Apple comes first!");

        }

    }
}

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