请教一个问题，请大家帮我看看！！！！！！！

Question

package bochung;import java.awt.*;import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class FrmTotalSale extends JDialog {
    JPanel jPanel1 = new JPanel();
    JPanel jPanel2 = new JPanel();
    BorderLayout borderLayout1 = new BorderLayout();
    JScrollPane jScrollPane1 = new JScrollPane();
    JTable tblShow = new JTable();
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();
    JComboBox cboProdouct = new JComboBox();
    JRadioButton rdoMonth = new JRadioButton();
    JRadioButton rdoSeason = new JRadioButton();
    JRadioButton rdoYear = new JRadioButton();
    JComboBox cboMonth = new JComboBox();
    JComboBox cboSeason = new JComboBox();
    JComboBox cboYear = new JComboBox();
    ButtonGroup btnGrp = new ButtonGroup();
    public FrmTotalSale() {
        try {
            this.setSize(600,400);
            this.setTitle("订单统计");
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }    private void jbInit() throws Exception {
        getContentPane().setLayout(null);
        this.setModal(true);
        jPanel2.setBorder(BorderFactory.createEtchedBorder());
        jPanel2.setBounds(new Rectangle(4, 2, 586, 176));
        jPanel2.setLayout(null);
        jLabel1.setText("统计方式：");
        jLabel1.setBounds(new Rectangle(24, 22, 63, 17));
        jLabel2.setText("产品名称：");
        jLabel2.setBounds(new Rectangle(406, 114, 63, 15));
        cboProdouct.setBounds(new Rectangle(397, 63, 99, 21));
        rdoMonth.setSelected(false);
        rdoMonth.setText("月");
        rdoMonth.setBounds(new Rectangle(94, 22, 45, 23));
        rdoSeason.setSelected(false);
        rdoSeason.setText("季");
        rdoSeason.setBounds(new Rectangle(94, 53, 45, 23));
        rdoYear.setText("年");
        rdoYear.setBounds(new Rectangle(94, 85, 45, 23));        cboMonth.setBounds(new Rectangle(140, 22, 31, 23));
        cboSeason.setBounds(new Rectangle(140, 53, 31, 23));
        cboYear.setBounds(new Rectangle(140, 85, 65, 23));
        this.getContentPane().add(jPanel2);
        jPanel2.add(jLabel1);
        jPanel2.add(rdoMonth);
        jPanel2.add(rdoSeason);
        jPanel2.add(rdoYear);
        jPanel2.add(jLabel2);
        jPanel2.add(cboProdouct);
        jPanel2.add(cboSeason);
        jPanel2.add(cboYear);
        jPanel2.add(cboMonth);
        this.getContentPane().add(jPanel1, null);
        jPanel1.add(jScrollPane1, java.awt.BorderLayout.CENTER);
        jScrollPane1.getViewport().add(tblShow);
        jPanel1.setBorder(BorderFactory.createEtchedBorder());
        jPanel1.setBounds(new Rectangle(4, 182, 586, 181));
        jPanel1.setLayout(borderLayout1);
        this.btnGrp.add(rdoMonth);
        this.btnGrp.add(rdoSeason);
        this.btnGrp.add(rdoYear);
        this.cboSeason.addItem("-");
       for(int i=1;i<=4;i++)
       {
           this.cboSeason.addItem(i);
       }
       this.cboMonth.addItem("-");
       for(int i=1;i<=12;i++)
       {
           this.cboMonth.addItem(i);
       }
       this.cboYear.addItem("--");
       for(int i=2000;i<=2030;i++)
       {
           this.cboYear.addItem(i);
       }
      
        //季的下拉框不可选
        if(this.rdoMonth.isSelected())
        {
           
           cboSeason.setEnabled(false);
        }
        //月的下拉框不可选
       else if(this.rdoSeason.isSelected())
        {
         
           cboMonth.setEnabled(false);
        }
       //月、季的下拉框不可选
      else
        {
           cboMonth.setEnabled(false);
           cboSeason.setEnabled(false);        }
    }
}
为什么这个代码执行不了这个效果呢?哪里有问题

Answer 1

              //月、季的下拉框不可选 
            else 
                { 
                      cboMonth.setEnabled(false); 
                      cboSeason.setEnabled(false);                 } 
        } 
之后加一句
              setVisible(true);

Answer 2

额~加在else{...}之后，刚才打错括号了

Answer 3

然后，我不是很确定，如果没有写ActionListener，动作效果能不能被触发，这个不是很清楚

Answer 4

package csdn;import java.awt.*;import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;public class FrmTotalSale extends JDialog implements ChangeListener{
JPanel jPanel1 = new JPanel(); JPanel jPanel2 = new JPanel(); BorderLayout borderLayout1 = new BorderLayout(); JScrollPane jScrollPane1 = new JScrollPane(); JTable tblShow = new JTable(); JLabel jLabel1 = new JLabel(); JLabel jLabel2 = new JLabel(); JComboBox cboProdouct = new JComboBox(); JRadioButton rdoMonth = new JRadioButton(); JRadioButton rdoSeason = new JRadioButton(); JRadioButton rdoYear = new JRadioButton(); JComboBox cboMonth = new JComboBox(); JComboBox cboSeason = new JComboBox(); JComboBox cboYear = new JComboBox(); ButtonGroup btnGrp = new ButtonGroup(); public FrmTotalSale() {
try {
this.setSize(600, 400);
this.setTitle("订单统计");
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
} private void jbInit() throws Exception {
getContentPane().setLayout(new FlowLayout());
this.setModal(true);
jPanel2.setBorder(BorderFactory.createEtchedBorder());
jPanel2.setBounds(new Rectangle(4, 2, 586, 176));
jPanel2.setLayout(new FlowLayout());
jLabel1.setText("统计方式：");
jLabel1.setBounds(new Rectangle(24, 22, 63, 17));
jLabel2.setText("产品名称：");
jLabel2.setBounds(new Rectangle(406, 114, 63, 15));
cboProdouct.setBounds(new Rectangle(397, 63, 99, 21));
rdoMonth.setSelected(false);
rdoMonth.setText("月");
rdoMonth.setBounds(new Rectangle(94, 22, 45, 23));
rdoMonth.addChangeListener(this);

rdoSeason.setSelected(false);
rdoSeason.setText("季");
rdoSeason.setBounds(new Rectangle(94, 53, 45, 23));
rdoSeason.addChangeListener(this);

rdoYear.setText("年");
rdoYear.setBounds(new Rectangle(94, 85, 45, 23));
rdoYear.addChangeListener(this);

cboMonth.setBounds(new Rectangle(140, 22, 31, 23));
cboSeason.setBounds(new Rectangle(140, 53, 31, 23));
cboYear.setBounds(new Rectangle(140, 85, 65, 23));
this.getContentPane().add(jPanel2);
jPanel2.add(jLabel1);
jPanel2.add(rdoMonth);
jPanel2.add(rdoSeason);
jPanel2.add(rdoYear);
jPanel2.add(jLabel2);
jPanel2.add(cboProdouct);
jPanel2.add(cboSeason);
jPanel2.add(cboYear);
jPanel2.add(cboMonth);
this.getContentPane().add(jPanel1, null);
jPanel1.add(jScrollPane1, java.awt.BorderLayout.CENTER);
jScrollPane1.getViewport().add(tblShow);
jPanel1.setBorder(BorderFactory.createEtchedBorder());
jPanel1.setBounds(new Rectangle(4, 182, 586, 181));
jPanel1.setLayout(borderLayout1);
this.btnGrp.add(rdoMonth);
this.btnGrp.add(rdoSeason);
this.btnGrp.add(rdoYear);
this.cboSeason.addItem("-");
for (int i = 1; i <= 4; i++) {
this.cboSeason.addItem(i + "");
}
this.cboMonth.addItem("-");
for (int i = 1; i <= 12; i++) {
this.cboMonth.addItem(i + "");
}
this.cboYear.addItem("--");
for (int i = 2000; i <= 2030; i++) {
this.cboYear.addItem(i + "");
} setVisible(true);

} public static void main(String[] args) {
new FrmTotalSale();
} public void stateChanged(ChangeEvent arg0) {
JRadioButton btn = (JRadioButton)arg0.getSource();
cboProdouct.setEnabled(true);
cboSeason.setEnabled(true);
cboYear.setEnabled(true);
cboMonth.setEnabled(true);
if(btn.isSelected()){
// 季的下拉框不可选
if ("季".equals(btn.getText())) {

cboSeason.setEnabled(false);
}
// 月的下拉框不可选
else if ("月".equals(btn.getText())) {

cboMonth.setEnabled(false);
}
// 月、季的下拉框不可选
else {
cboMonth.setEnabled(false);
cboSeason.setEnabled(false);
}
System.out.println(btn.isSelected());
System.out.println(btn.getText()); }

}
}

Answer 5

顶6楼的，楼主参考6楼的吧！你的代码里好像少了main函数。

Answer 6

6楼的代码运行时有点问题。在鼠标移动到按钮上时就有状态被触发，然后这个状态并不是所需要的
                         在点击选择季度的时候季度选项条变为不可用/选择月的时候月变为不可用？
stateChanged作了一下小改动。
    public void stateChanged(ChangeEvent arg0) {        cboProdouct.setEnabled(true);
 //       cboSeason.setEnabled(true);
        cboYear.setEnabled(true);
 //       cboMonth.setEnabled(true);
        JRadioButton btn = (JRadioButton)arg0.getSource();
        if(btn.isSelected()){
            // 季的下拉框不可选
            if ("月".equals(btn.getText())) {
    
                cboSeason.setEnabled(false);
                cboMonth.setEnabled(true);
            }
            // 月的下拉框不可选
            else if ("季".equals(btn.getText())) {
    
                cboMonth.setEnabled(false);
                cboSeason.setEnabled(true);
            }
            // 月、季的下拉框不可选
            else {
                cboMonth.setEnabled(false);
                cboSeason.setEnabled(false);
            }        
   //         System.out.println(btn.isSelected());
   //         System.out.println(btn.getText());        }
        
    }