注释标注的代码的输出结果. import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Win extends JFrame { JTextField text; JButton buttonSquare,buttonCubic; Listener listen; public Win() { setLayout(new FlowLayout()); text = new JTextField(8); buttonSquare = new JButton("求平方"); buttonCubic = new JButton("求立方"); listen = new Listener(); listen.setView(this); buttonSquare.addActionListener(listen); buttonCubic .addActionListener(l