【单选题】import java.awt.*; import javax.swing.*; public class TryJFrame { public static void main(String agrs[]) { JFrame frame = new JFrame("JFrame应用举例"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)...
A.
JFrame frame = new JFrame("JFrame应用举例");
B.
JLabel label = new JLabel("JFrame应用举例",swingConstants.CENTER);