// Program displays some facts about a stringpublic class DebugSeven3{public static void main(String[] args){ String quote ="Honesty is the first chapter in the book of wisdom. - Thomas Jefferson"; System.out.println("index.of('f') is: " + indexOf('f'));System.out.println("index.of('x') is: " + indexOf('x'));System.out.println("char.At(5) is: " + charAt(5));System.out.println("endsWith(\"daughter\") is: " + quote.endswith("daughter"));System.out.println("endsWith(\"son\") is: " + quote.endswith("son"));System.out.println("replace('e', '*') is: " + quote.replace('e', 'M'));}}

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.