https://docs.oracle.com/javase/jp/9/docs/api/javax/swing/JOptionPane.html
JOptionPane (Java SE 9 & JDK 9 )
java sejdk
https://pastebin.com/ZxRAkLHd
import java.io.*; import java.util.*; import javax.swing.JOptionPane; - Pastebin.com
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java ioimportutiljavaxswing