为什么用JTree生成的数中单击子节点不会响应事件?
我的程序如下:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*; class Mtree extends JFrame implements TreeSelectionListener
{ JTree tree=null;
JPanel p=null;
JButton button;
Mtree(String s)
{ super(s);
Container con=this.getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("主业务功能");
DefaultMutableTreeNode t1=new DefaultMutableTreeNode("账户管理");
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("事物查询");
DefaultMutableTreeNode t3=new DefaultMutableTreeNode("用户存款");
DefaultMutableTreeNode t4=new DefaultMutableTreeNode("用户取款");
DefaultMutableTreeNode t5=new DefaultMutableTreeNode("数据维护");
DefaultMutableTreeNode t6=new DefaultMutableTreeNode("系统表查看");
DefaultMutableTreeNode t7=new DefaultMutableTreeNode("系统账户管理");
DefaultMutableTreeNode t8=new DefaultMutableTreeNode("退出系统");
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("新用户开户");
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode("用户资料明细");
DefaultMutableTreeNode t1_3=new DefaultMutableTreeNode("账户密码修改");
DefaultMutableTreeNode t2_1=new DefaultMutableTreeNode("账户金额查询");
DefaultMutableTreeNode t2_2=new DefaultMutableTreeNode("交易记录查询");
DefaultMutableTreeNode t2_3=new DefaultMutableTreeNode("账户信息查询");
DefaultMutableTreeNode t5_1=new DefaultMutableTreeNode("数据导出");
DefaultMutableTreeNode t5_2=new DefaultMutableTreeNode("数据导入");
DefaultMutableTreeNode t7_1=new DefaultMutableTreeNode("添加管理员账户");
DefaultMutableTreeNode t7_2=new DefaultMutableTreeNode("管理员密码修改");
root.add(t1);root.add(t2);root.add(t3);root.add(t4);
root.add(t5);root.add(t6);root.add(t7);root.add(t8);
t1.add(t1_1);t1.add(t1_2);t1.add(t1_3);
t2.add(t2_1);t2.add(t2_2);t2.add(t2_3);
t5.add(t5_1);t5.add(t5_2);t7.add(t7_1);t7.add(t7_2);
JTree tree= new JTree(root);
JScrollPane panel = new JScrollPane(p=new JPanel());
JSplitPane splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,tree,panel);
con.add(splitpane);
tree.addTreeSelectionListener(this);
System.out.println(tree);
this.validate();
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setBounds(80, 60, 800, 600);
this.setVisible(true);
System.out.println("333");
}
public void valueChanged(TreeSelectionEvent e)
{ // TODO 自动生成方法存根
System.out.println("444");
if(e.getSource()==tree)//这里似乎无法获得事件源
{ String str=null;
System.out.println("555");
System.out.println(str);
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{
str=node.toString();
System.out.println(str);
if(str.equals("新用户开户"))
{System.out.println("新用户开户");}
else if(str.equals("用户资料明细"))
{System.out.println("用户资料明细");}
else if(str.equals("账户金额查询"))
{System.out.println("账户金额查询");}
else if(str.equals("交易记录查询"))
{System.out.println("交易记录查询");}
else if(str.equals("账户信息查询"))
{System.out.println("账户信息查询");}
else if(str.equals("数据导出"))
{System.out.println("数据导出");}
else if(str.equals("数据导入"))
{System.out.println("数据导入");}
else if(str.equals("用户存款"))
{System.out.println("用户存款");}
else if(str.equals("退出系统"))
{System.out.println("退出系统");}
else if(str.equals("系统表查看"))
{System.out.println("系统表查看");}
else if(str.equals("用户取款"))
{System.out.println("用户取款");}
}
else
{System.out.println("ERROR");} }
else{System.out.println("oooooo");}
}
}
public class 主窗体
{
public static void main(String args[])
{
//MTree win=new MTree("- 。-");
//win.pack();
new MTree("- 。-");
}
}
我没学过JAVA,但老师要求用JAVA来做。我也只好边做边学了。为什么我的这个程序生成的框架中 ,单击左边的树形菜单中的子节点无法
看到System.out.println(" ")语句输出的内容?请高手和版主指点,本人
先谢了哈。还有就是如何在右边升成的P(Panel)中添加不同的界面?在单击左边不同的子节点时,右边的界面可以切换 。请大狭给点思路。
我的程序如下:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*; class Mtree extends JFrame implements TreeSelectionListener
{ JTree tree=null;
JPanel p=null;
JButton button;
Mtree(String s)
{ super(s);
Container con=this.getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("主业务功能");
DefaultMutableTreeNode t1=new DefaultMutableTreeNode("账户管理");
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("事物查询");
DefaultMutableTreeNode t3=new DefaultMutableTreeNode("用户存款");
DefaultMutableTreeNode t4=new DefaultMutableTreeNode("用户取款");
DefaultMutableTreeNode t5=new DefaultMutableTreeNode("数据维护");
DefaultMutableTreeNode t6=new DefaultMutableTreeNode("系统表查看");
DefaultMutableTreeNode t7=new DefaultMutableTreeNode("系统账户管理");
DefaultMutableTreeNode t8=new DefaultMutableTreeNode("退出系统");
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("新用户开户");
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode("用户资料明细");
DefaultMutableTreeNode t1_3=new DefaultMutableTreeNode("账户密码修改");
DefaultMutableTreeNode t2_1=new DefaultMutableTreeNode("账户金额查询");
DefaultMutableTreeNode t2_2=new DefaultMutableTreeNode("交易记录查询");
DefaultMutableTreeNode t2_3=new DefaultMutableTreeNode("账户信息查询");
DefaultMutableTreeNode t5_1=new DefaultMutableTreeNode("数据导出");
DefaultMutableTreeNode t5_2=new DefaultMutableTreeNode("数据导入");
DefaultMutableTreeNode t7_1=new DefaultMutableTreeNode("添加管理员账户");
DefaultMutableTreeNode t7_2=new DefaultMutableTreeNode("管理员密码修改");
root.add(t1);root.add(t2);root.add(t3);root.add(t4);
root.add(t5);root.add(t6);root.add(t7);root.add(t8);
t1.add(t1_1);t1.add(t1_2);t1.add(t1_3);
t2.add(t2_1);t2.add(t2_2);t2.add(t2_3);
t5.add(t5_1);t5.add(t5_2);t7.add(t7_1);t7.add(t7_2);
JTree tree= new JTree(root);
JScrollPane panel = new JScrollPane(p=new JPanel());
JSplitPane splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,tree,panel);
con.add(splitpane);
tree.addTreeSelectionListener(this);
System.out.println(tree);
this.validate();
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setBounds(80, 60, 800, 600);
this.setVisible(true);
System.out.println("333");
}
public void valueChanged(TreeSelectionEvent e)
{ // TODO 自动生成方法存根
System.out.println("444");
if(e.getSource()==tree)//这里似乎无法获得事件源
{ String str=null;
System.out.println("555");
System.out.println(str);
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{
str=node.toString();
System.out.println(str);
if(str.equals("新用户开户"))
{System.out.println("新用户开户");}
else if(str.equals("用户资料明细"))
{System.out.println("用户资料明细");}
else if(str.equals("账户金额查询"))
{System.out.println("账户金额查询");}
else if(str.equals("交易记录查询"))
{System.out.println("交易记录查询");}
else if(str.equals("账户信息查询"))
{System.out.println("账户信息查询");}
else if(str.equals("数据导出"))
{System.out.println("数据导出");}
else if(str.equals("数据导入"))
{System.out.println("数据导入");}
else if(str.equals("用户存款"))
{System.out.println("用户存款");}
else if(str.equals("退出系统"))
{System.out.println("退出系统");}
else if(str.equals("系统表查看"))
{System.out.println("系统表查看");}
else if(str.equals("用户取款"))
{System.out.println("用户取款");}
}
else
{System.out.println("ERROR");} }
else{System.out.println("oooooo");}
}
}
public class 主窗体
{
public static void main(String args[])
{
//MTree win=new MTree("- 。-");
//win.pack();
new MTree("- 。-");
}
}
我没学过JAVA,但老师要求用JAVA来做。我也只好边做边学了。为什么我的这个程序生成的框架中 ,单击左边的树形菜单中的子节点无法
看到System.out.println(" ")语句输出的内容?请高手和版主指点,本人
先谢了哈。还有就是如何在右边升成的P(Panel)中添加不同的界面?在单击左边不同的子节点时,右边的界面可以切换 。请大狭给点思路。
换成
tree= new JTree(root);
换成鼠标事件试一下吧
关于panel 可以把不同的界面都做成panel
然后在右边的panel中 remove(old) 然后再add(new) 进去
===
试一下CardLayout布局
JTree tree= new JTree(root);
换成
tree= new JTree(root);搞定 太粗心了哈
===
试一下CardLayout布局
我用CardLayout布局试了测试不成功 。
错误:
htmmp
Exception in thread "main" java.lang.IllegalArgumentException: cannot add to layout: constraint must be a string
at java.awt.CardLayout.addLayoutComponent(CardLayout.java:190)
at java.awt.Container.addImpl(Container.java:1058)
at java.awt.Container.add(Container.java:351)
at exw.<init>(ex.java:36)
at ex.main(ex.java:75)
程序代码:
import java.awt.*;
import java.awt.event.*;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
class exw extends JFrame implements ActionListener
{
CardLayout my;
JButton b1,b2,b3;
JPanel p,p1;
ChangePass_SYS p2,p4;Changepass p3;
exw()
{ Container con=this.getContentPane();
my=new CardLayout();
con.setLayout(new BorderLayout());
p1=new JPanel();
b1=new JButton("上");
b2=new JButton("中");
b3=new JButton("下");
p1.add(b1);p1.add(b2);p1.add(b3);
b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);
p=new JPanel();
p.setLayout(my);
p2=new ChangePass_SYS();//这个是用panel做的界面,测试过了没问题
p3=new Changepass();//同上
p4=new ChangePass_SYS();
p.add(p2);p.add(p3);p.add(p4);//ex.java:36
con.add(p,BorderLayout.CENTER);con.add(p2,BorderLayout.SOUTH);
this.validate(); //让你加的组件刷新到窗口
this.addWindowListener(new WindowAdapter(){ //添加窗口事件响应,以便能关掉窗口
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setBounds(200, 300, 600, 600); //设置窗口大小
this.setVisible(true); //设置窗口的可视化,以便能看得见
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
{
my.first(p);
}
else if(e.getSource()==b2)
{
my.next(p);
}
else if(e.getSource()==b3)
{
my.last(p);
}
}
}
public class ex
{
public static void main(String args[])
{
// @SuppressWarnings("unused")
System.out.println("htmmp");
//Win w=new Win("login");
new exw();//ex.java:75
}
}不知道是不是我程序的问题。
p.add(p3);
p.add(p4);
换成
my.addLayoutComponent(p2, "p2");
my.addLayoutComponent(p3, "p3");
my.addLayoutComponent(p4, "p4");