我创建菜单再给窗体加入面板,菜单就看不见了,而J面板就可以看见,不过它们都接受不到键盘事件???我式了n个机子我家的单位的都一样..帮我看看那里错误 package myprojects.edacioussnake;
import java.awt.*; import java.awt.event.*; import javax.swing.*;
class EdaciousSnakeFrom extends JFrame { Container c=getContentPane(); RoomMap DomePanel=new RoomMap(); JMenuBar JWnMnuBar=new JMenuBar(); JMenu MainMunBtn[]=new JMenu[3]; String MainMunBtnStrings[]={"Operation","Seting","Help"}; JMenuItem OperationBtn[]=new JMenuItem[4]; int OperationModeID=2;//0~2 String OperationModeStrings[]={"continue","Step"}; String OperationBtnStrings[]={"Start","#Mode","Stop","-","Exit"}; JMenu SetLevelBtn=new JMenu("LeveL"); JRadioButtonMenuItem LvNumber[]=new JRadioButtonMenuItem[4]; JMenuItem HelpBtn=new JMenuItem("Help"); ButtonGroup grop=new ButtonGroup(); public EdaciousSnakeFrom() { int i; boolean enabled=true; int index=0; for(i=0;i<MainMunBtn.length;i++) MainMunBtn[i]=new JMenu(MainMunBtnStrings[i]); for(i=0;i<OperationBtn.length;i++){ if(OperationBtnStrings[i]=="-"){ MainMunBtn[0].addSeparator(); index++; } else if(OperationBtnStrings[i]=="#Mode"){ if(OperationModeID==0) OperationBtnStrings[i]=OperationModeStrings[OperationModeID]; else if(OperationModeID==1) OperationBtnStrings[i]=OperationModeStrings[OperationModeID]; else if(OperationModeID==2) enabled=false; }
OperationBtn[i]=new JMenuItem(OperationBtnStrings[index]); OperationBtn[i].setEnabled(enabled); enabled=true; MainMunBtn[0].add(OperationBtn[i]); index++; } for(i=0;i<LvNumber.length;i++){ LvNumber[i]=new JRadioButtonMenuItem("Lv." + (i+1)); grop.add(LvNumber[i]); SetLevelBtn.add(LvNumber[i]); } MainMunBtn[1].add(SetLevelBtn); MainMunBtn[2].add(HelpBtn); for(i=0;i<MainMunBtn.length;i++){ JWnMnuBar.add(MainMunBtn[i]); } setJMenuBar(JWnMnuBar); c.add(DomePanel,BorderLayout.CENTER); setSize(300,500); show(); }
public static void main(String args[]) { new EdaciousSnakeFrom(); } }
class RoomMap extends Panel{ Snake OLaSnake=new Snake(); KeyEventer KeyOperation=new KeyEventer(); public RoomMap(){ addKeyListener(KeyOperation); } public void paint(Graphics g){ } class KeyEventer extends KeyAdapter{ public void KeyPressed(KeyEvent e){ System.out.println(e.getKeyCode()); }
} }
class Snake{ public int definition; public int speed; public int state; private int orientation private void getPoint(int num){ } public void round(int orientation){ } public void steer(){ }
}
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我这只菜鸟看了你们高手的这些东东 哎!!!自卑啊~~~~~~~
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所以说努力把~~java停简单的就是有点怪,我开始学的时候许多地方不解..习惯就好了
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// try it
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Frame1 extends JFrame
{
Container c=getContentPane();
RoomMap DomePanel = new RoomMap();
JMenuBar JWnMnuBar = new JMenuBar();
JMenu MainMunBtn[] = new JMenu[3];
String MainMunBtnStrings[] = {"Operation","Seting","Help"};
JMenuItem OperationBtn[] = new JMenuItem[4];
int OperationModeID = 2; //0~2
String OperationModeStrings[] = {"continue","Step"};
String OperationBtnStrings[] = {"Start","#Mode","Stop","-","Exit"};
JMenu SetLevelBtn = new JMenu("LeveL");
JRadioButtonMenuItem LvNumber[] = new JRadioButtonMenuItem[4];
JMenuItem HelpBtn = new JMenuItem("Help");
ButtonGroup grop = new ButtonGroup();
public Frame1()
{
int i;
boolean enabled=true;
int index=0;
for(i=0;i<MainMunBtn.length;i++)
MainMunBtn[i]=new JMenu(MainMunBtnStrings[i]);
for(i=0;i<OperationBtn.length;i++)
{
if(OperationBtnStrings[i]=="-")
{
MainMunBtn[0].addSeparator();
index++;
}
else if(OperationBtnStrings[i]=="#Mode")
{
if(OperationModeID==0)
OperationBtnStrings[i]=OperationModeStrings[OperationModeID];
else if(OperationModeID==1)
OperationBtnStrings[i]=OperationModeStrings[OperationModeID];
else if(OperationModeID==2)
enabled=false;
}
OperationBtn[i]=new JMenuItem(OperationBtnStrings[index]);
OperationBtn[i].setEnabled(enabled);
enabled=true;
MainMunBtn[0].add(OperationBtn[i]);
index++;
}
for(i=0;i<LvNumber.length;i++)
{
LvNumber[i]=new JRadioButtonMenuItem("Lv." + (i+1));
grop.add(LvNumber[i]);
SetLevelBtn.add(LvNumber[i]);
}
MainMunBtn[1].add(SetLevelBtn);
MainMunBtn[2].add(HelpBtn);
for(i=0;i<MainMunBtn.length;i++)
{
JWnMnuBar.add(MainMunBtn[i]);
}
setJMenuBar(JWnMnuBar);
c.add(DomePanel, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Test");
}
public static void main(String args[])
{
Frame1 frame1 = new Frame1();
frame1.setSize(300, 500);
frame1.setVisible(true);
}
}
class RoomMap extends JPanel
{
Snake OLaSnake=new Snake();
KeyEventer KeyOperation=new KeyEventer();
public RoomMap()
{
super.setBackground(Color.white);
addKeyListener(KeyOperation);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
super.invalidate();
super.requestFocus();
}
class KeyEventer extends KeyAdapter
{
public void keyPressed(KeyEvent e)
{
System.out.println(e.getKeyCode());
}
}
}
class Snake
{
public int definition;
public int speed;
public int state;
private int orientation;
private void getPoint(int num)
{
}
public void round(int orientation)
{
}
public void steer()
{
}
}
// viel Spass
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关于编程风格问题说几句：一些Java程序员将函数的起始大括号直接放在函数后面，也就是放在同一行，就像你的代码的那种风格，我认为这种风格不好，它降低了程序的可读性，特别是当程序长了以后，更无法看清块的结构，通常C/C++程序员都将大括号另起一行，并且'{''}'上下对齐，块的代码缩进两格，这样程序的结构便一目了然了。
你的那个JFrame 的Constructor 写的不好，写得太复杂了，何必用什么 for-loop, if, else 呢，
建立一个JMenu 然后建立其JMenuItem，并加入，这样不是更好吗？
通常你还要为JMenuItem 写ActionListener，这样按部就班的写，代码会长一些，但是可读性强，代码也容易写。
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