Cómo poner borde a un JComponent

//llamando al color por su nombre

JComponent.setBorder(BorderFactory.createLineBorder(Color.black));

//creando una variable Color

Color color = new Color(131,111,255);
JComponent.setBorder(BorderFactory.createLineBorder(color ,2));

Tipos de borde en la clase BorderFactory:

• createEmptyBorder((int top, int left, int bottom, int right)
• createLineBorder(Color.color, int thickness)
• createMatteBorder(int top, int left, int bottom, int right, Color.color)
• createLoweredBevelBorder()
• createRaisedBevelBorder()