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JOptionPaneクラス
11. ダイアログ (2) | TECHSCORE(テックスコア)
JOptionPane of Swing
Using JOptionPane to prompt user confirmation: a demo : JOptionPane Dialog « Swing « Java Tutorial
Adding Components to the Button Area: Using JOptionPane with a JButton containing a text label and an icon : JOptionPane Dialog « Swing « Java Tutorial
Using Message Box in J option pane | bhuvaneshwarimath
How to Make Dialogs (The Java™ Tutorials > Creating a GUI With Swing > Using Swing Components)