Web Reference: Definition and Usage The length() method returns the length of a specified string. Note: The length of an empty string is 0. Oct 11, 2025 · In Java, a String represents a sequence of characters used for storing and manipulating text. It is immutable and provides many built-in methods for operations like concatenation, comparison, and manipulation. length() returns the number of characters present in the string. It works on String, and also on StringBuilder and StringBuffer. It’s a public member method, accessed with the dot operator. It does not work on arrays; arrays use .length without parentheses. Quick demo for StringBuilder and StringBuffer: StringBuilder sb = new StringBuilder ...
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