flutter write $ in text code example

Example 1: Flutter new paragraph text

child: Container(
         child :  Text('''
                          Text1
                          Text2
                          Text3''',maxLines: 20, style: TextStyle(fontSize: 16.0 ,fontWeight:FontWeight.bold,color: Colors.black) , )
      ),

Example 2: flutter text wisget

const Text(
  this.data, {
  Key key,
  this.style,
  this.strutStyle,
  this.textAlign,
  this.textDirection,
  this.locale,
  this.softWrap,
  this.overflow,
  this.textScaleFactor,
  this.maxLines,
  this.semanticsLabel,
  this.textWidthBasis,
  this.textHeightBehavior,
}) : assert(
       data != null,
       'A non-null String must be provided to a Text widget.',
     ),
     textSpan = null,
     _applyTextScaleFactorToWidgetSpan = true,
     super(key: key);