public class MyClass {
    public static void main(String args[]) {
        System.out.println( PoC("shellroot") );
    }
 
    public static String PoC(String Nick){
        return Nick;
    }
}

String oSQL = "SELECT * FROM Usuario WHERE Id = '" & this.TextBox1.Text & "'";

Function test1() As String
    MsgBox Shell("Powershell Get-Date")
End Function