javax.swing.JOptionPane.showMessageDialog() 方法

//default title and icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Message");

//custom title, warning icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);

//custom title, error icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane error",
JOptionPane.ERROR_MESSAGE);

//custom title, no icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"A plain message",
JOptionPane.PLAIN_MESSAGE);

//custom title, custom icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane custom dialog",
JOptionPane.INFORMATION_MESSAGE,
icon);