|String stringOne = "Hello String";||using a constant String|
|String stringOne = String('a');||converting a constant char into a String|
|String stringTwo = String("This is a string");||converting a constant string into a String object|
|String stringOne = String(stringTwo + " with more");||using a constant integer|
|String stringOne = String(13);||using an int and a base|
|String stringOne = String(analogRead(0), DEC);||using an int and a base (binary)|
|String stringOne = String(millis(), DEC);||M using a long and a base|
|String stringOne = String(5.698, 3);||using a float and the decimal places|
String Appending Operators
Just as you can concatenate Strings with other data objects using the StringAdditionOperator, you can also use the += operator and the concat() method to append things to Strings. The += operator and the concat() method work the same way, it's just a matter of which style you prefer. The two examples below illustrate both, and result in the same String:
String Comparison Operators
The String comparison operators ==, !=,>, < ,>=, <= , and the equals() and equalsIgnoreCase() methods allow you to make alphabetic comparisons between Strings. They're useful for sorting and alphabetizing, among other things.
The operator == and the method equals() perform identically. In other words
substringIt allows you to look for an instance of a particular substring within a given String.
String indexOf() and lastIndexOf() Method
The String object indexOf() method gives you the ability to search for the first instance of a particular character value in a String. You can also look for the first instance of the character after a given offset. The lastIndexOf() method lets you do the same things from the end of a String.
In this case, firstClosingBracket equals 5, because the first > character is at position 5 in the String (counting the first character as 0). If you want to get the second closing bracket, you can use the fact that you know the position of the first one, and search from firstClosingBracket + 1 as the offset, like so:
stringOne = ""; int secondClosingBracket = stringOne.indexOf('>', firstClosingBracket + 1 ); The result would be 11, the position of the closing bracket for the HEAD tag. If you want to search from the end of the String, you can use the lastIndexOf() method instead. This function returns the position of the last occurrence of a given character.
In this case, lastOpeningBracket equals 12, the position of the < for the BODY tag. If you want the opening bracket for the HEAD tag, it would be at stringOne.lastIndexOf('<', lastOpeningBracket -1), or 6.
String length()We can get the length of Strings using the length() command.
String to Int Function
The toInt() function allows you to convert a String to an integer number.