append (CharSequence s)

public synchronized StringBuffer append(CharSequence s)

Appends the specified CharSequence to this sequence. If s is null, then the four characters "null" are appended.

class StringBufferAppendCharSequence{
 public static void main(String args[]){
  StringBuffer s1 = new StringBuffer("Value of s1 is ");
  StringBuffer s2 = new StringBuffer("Value of s2 is ");
  CharSequence c1 = "wxyz";
  CharSequence c2 = null;
  
  s1.append(c1);
  s2.append(c2);
  
  System.out.println(s1);
  System.out.println(s2);
 }
}

Output

Value of s1 is wxyz
Value of s2 is null

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