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.
Section 1 - Obtaining the Length of a String
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
Section 2 - Retrieving the Character at an Index in a String Object
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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