Update Finance_Hub.java

[jiajun0308]

I have added two currency options to the program which will enhance the program's features. I am looking forward to change the interface to make it more accessible through web platforms but at the moment I will stick with this first. Please review the work and check if the code I applied is appropriate.

Therefore, I slightly adjust the position of the checkbox to make sure each currency option is positioned appropriately using the (width, height) for the checkbox position and (length, height) for the checkbox size.

 dollarJCheckBox = new JCheckBox();
dollarJCheckBox.setText( "Dollar" );
dollarJCheckBox.setBounds(20,140,100,20);
contentPane.add(dollarJCheckBox);
      
yenJCheckBox = new JCheckBox();
yenJCheckBox.setText( "Yen" );
yenJCheckBox.setBounds(20,180,100,20);
contentPane.add(yenJCheckBox);