insert (int offset, long l)

public StringBuffer insert(int offset, long l)

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

public class StringBufferInsertLong {
    public static void main(String args[]){
       long longVal = 10;
       StringBuffer str = new StringBuffer("Value of longVal is ");
       str.insert(str.length(), longVal);
       System.out.println(str);
    }
}

Output

Value of longVal is 10

1. Throws StringIndexOutOfBoundsException, if the offset is invalid.

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