how to set the border radius for container in flutter code example

Example 1: flutter container rounded corners

Container(
  decoration: BoxDecoration(
    border: Border.all(
      color: Colors.red[500],
    ),
    borderRadius: BorderRadius.all(Radius.circular(20))
  ),
  child: ...
)

Example 2: flutter container border radius

Container(
  child: Text(
    'This is a Container',
    textScaleFactor: 2,
    style: TextStyle(color: Colors.black),
  ),
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(10),
    color: Colors.white,
    boxShadow: [
      BoxShadow(color: Colors.green, spreadRadius: 3),
    ],
  ),
  height: 50,
),

Example 3: flutter border radius

borderRadius: BorderRadius.all(Radius.circular(5.0))

Example 4: flutter container rounded corners

new Center(    child: new Container(      width: 200.0,      height: 200.0,      color: Colors.white,      child: new Container(        decoration: new BoxDecoration(          border: new Border.all(              color: Colors.green,              width: 5.0,              style: BorderStyle.solid          ),          borderRadius: new BorderRadius.all(new Radius.circular(20.0)),          image: new DecorationImage(              image: new AssetImage('assets/images/JL-Logo-150.png'),          )        ),      ),    ),  );