问题
单项选择题
在表单中加入两个命令按钮：Command1和Command2，编写Command1的Click事件代码如下ThisForm.Parent.Command2.Enabled=.F.，则单击按钮Command1后，执行命令（）。
A、Command1命令按钮不能激活
B、Command2命令按钮不能激活
C、事件代码无法执行
D、命令按钮组中第二个命令按钮不能激活
答案
参考答案：C
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import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import javax.swing.table.TableModel;public class ex13_2 extends JFrame{ private JTable jt; private String[][] strData; public static void main(String[] args){ ex13_2 obj13_2=new ex13_2(); obj13_2.pack(); obj13_2.setVisible(true); } public ex13_2(){ String[] columnNames={"name","java","c++","average"}; strData=new String[][]{{"Mike","70.0","80.0","75.0"},{"Jack","70.0","100.0","85.0"},{"David","75.0","95.0","85.0"},{"Tom","60.0","80.0","70.0"}}; jt=new JTable(strData,columnNames); jt.setPreferredScrollableViewportSize(new Dimension(400,200)); JScrollPane tp=new JScrollPane(jt); setTitle("ex13_2"); Container cp=getContentPane(); cp.add(tp,BorderLayout.CENTER); addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent we) { System.exit(0);} }); jt.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); TableModel tm=jt.getModel(); tm.addTableModelListener(new TableModelListener(){ public void tableChanged(TableModelEvent tme){ int nRow=tme.getFirstRow();float fNum;float fSum=0;for(int i=1;i<=2;i++){ fNum=Float.parseFloat( ); fSum+=fNum;}float fAverage=fSum/2; ; } }); } }