Important Methods in the StringBuffer and StringBuilder Classes

public synchronized StringBuffer append(String s)

StringBuffer sb = new StringBuffer("set ");

sb.append("point");

System.out.println(sb); // output is "set point"

public StringBuilder delete(int start, int end)

StringBuilder sb = new StringBuilder("0123456789");

System.out.println(sb.delete(4,6)); // output is "01236789

public StringBuilder insert(int offset, String s)

StringBuilder sb = new StringBuilder("01234567");

sb.insert(4, "---");

System.out.println( sb ); // output is "0123---4567"

public synchronized StringBuffer reverse()

StringBuffer s = new StringBuffer("A man a plan a canal Panama");

sb.reverse();

System.out.println(sb); // output: "amanaP lanac a nalp a nam A"

public String toString()

StringBuffer sb = new StringBuffer("test string");

System.out.println( sb.toString() ); // output is "test string"