substring (int start, int end)

public synchronized CharSequence subSequence(int start, int end)

Returns the substring begins at the specified start and extends to the character at index end – 1.

public class StringBufferSubString {
    public static void main(String args[]){
        StringBuffer s1 = new StringBuffer("Hello, How are you");
        System.out.println(s1.substring(7, s1.length()));
    }
}

Output

How are you

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