insert (int offset, boolean b)

public StringBuffer insert(int offset, boolean b)

Inserts the string representation of the boolean argument into this sequence at the indicated offset.

public class StringBufferInsert {
    public static void main(String args[]){
        StringBuffer str = new StringBuffer("String str is ");
        str.insert(str.length(), true);
        System.out.println(str);
    }
}

Output

String str is true

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