JAVATM- The Beginnings
A string can be viewed as a series of characters beginning at index zero. The String class provides several methods which perform useful string operations.
The string “Hello” contains five characters indexed from zero through four.
We can use the String class’s length method to return the number of characters in the string.
System.out.println(s.length()); // Prints 5
String s1 = "";
System.out.println(s1.length()); // Prints 0
String s2 = " World";
System.out.println(s2.length()); // Prints 6
String s3 = s + s2;;
System.out.println(s3.length()); // Prints 11
The charAt method returns the character located at an index in a string. The value returned is of primitive type char. It takes an int argument which specifies the index.
char charAt(int pos)
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