setCharAt (int index, char ch)

public synchronized void setCharAt(int index, char ch)

The character at the specified index is set to ch.

public class StringBufferSetCharAt {
    public static void main(String args[]){
        StringBuffer st = new StringBuffer("abababab");
        
        System.out.println("Before :" + st);
        
        for(int i=0; i < st.length(); i++){
            if(i%2 == 0)
                st.setCharAt(i, 'b');
            else
                st.setCharAt(i, 'a');
        }
        
         System.out.println("After :" + st);
    }
}

Output

Before :abababab
After :babababa

1. Throws IndexOutOfBoundsException, if index is negative or greater than or equal to length().

 

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