JOptionPane

生成输入框

String numberString1 = JOptionPane.showInputDialog("Enter the first number: ");

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生成消息框

JOptionPane.showMessageDialog(null, number1 + " <= " + number2 + " <= " + number3);

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生成确认框

  int answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set1);
  if(answer == JOptionPane.YES_OPTION)
      day += 1;