A、java.awt
B、java.awt.event
C、javax.swing
D、java.util
A、JOptionPane.messageDialog(this, "您输入了非法字符", "警告对话框", JOptionPane.WARNING_MESSAGE);
B、new JOptionPane.messageDialog(this, "您输入了非法字符", "警告对话框", JOptionPane.WARNING_MESSAGE);
C、JOptionPane.showMessageDialog(this, "您输入了非法字符", "警告对话框", JOptionPane.WARNING_MESSAGE);
D、new JOptionPane.showMessageDialog(this, "您输入了非法字符", "警告对话框", JOptionPane.WARNING_MESSAGE);
A、import java.swing;
B、import java.swing.*;
C、import javax.swing;
D、import javax.swing.*;
业主在确定分包单位时有何不妥之处?
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