java菜单栏例子的源代码有哪些？

1、第一个Swing程序——JFrame窗体

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需要注意的是 JFrame窗体在初始设置的时候存在几个问题：

1 窗体默认不可见，需要设置成为可见

2 窗体默认没有大小，需要设置其大小

3 窗体默认不能关闭，需要设置关闭方式

2、JFrame中添加面板、布局方式与控件

急求Java窗体设计代码？我会追加分的

计算器：import java.awt.*;

import java.awt.event.*;

import java.awt.BorderLayout;

import javax.swing.JPanel;

import javax.swing.JFrame;

import java.awt.TextField;

import java.awt.Rectangle;

import java.awt.Button;

import java.awt.Label;public class suanfa extends JFrame {private static final long serialVersionUID = 1L;private JPanel jContentPane = null;private TextField textField = null;private TextField textField1 = null;private Button button = null;private Button button1 = null;private Button button2 = null;private Button button3 = null;private Label label = null;

double awn;

/**

* This is the default constructor

*/

public suanfa() {

super();

initialize();

}/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setSize(300, 250);

this.setContentPane(getJContentPane());

this.setTitle("JFrame");

}/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

label = new Label();

label.setBounds(new Rectangle(12, 129, 90, 27));

label.setText(String.format("%.6f",awn));

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(getTextField(), null);

jContentPane.add(getTextField1(), null);

jContentPane.add(getButton(), null);

jContentPane.add(getButton1(), null);

jContentPane.add(getButton2(), null);

jContentPane.add(getButton3(), null);

jContentPane.add(label, null);

}

return jContentPane;

}/**

* This method initializes textField

*

* @return java.awt.TextField

*/

private TextField getTextField() {

if (textField == null) {

textField = new TextField();

textField.setBounds(new Rectangle(11, 20, 75, 32));

}

return textField;

}/**

* This method initializes textField1

*

* @return java.awt.TextField

*/

private TextField getTextField1() {

if (textField1 == null) {

textField1 = new TextField();

textField1.setBounds(new Rectangle(11, 67, 75, 32));

}

return textField1;

}/**

* This method initializes button

*

* @return java.awt.Button

*/

private Button getButton() {

if (button == null) {

button = new Button("加");

button.setBounds(new Rectangle(134, 17, 71, 29));

button.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

awn=Double.valueOf(textField.getText()) + Double.valueOf(textField1.getText());

label.setText(String.format("%.6f",awn));

}

catch(Exception ex){

return;

}

}

});

}

return button;

}/**

* This method initializes button1

*

* @return java.awt.Button

*/

private Button getButton1() {

if (button1 == null) {

button1 = new Button("减");

button1.setBounds(new Rectangle(134, 52, 71, 29));

button1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

awn=Double.valueOf(textField.getText()) - Double.valueOf(textField1.getText());

label.setText(String.format("%.6f",awn));

}

catch(Exception ex){

return;

}}

});

}

return button1;

}/**

* This method initializes button2

*

* @return java.awt.Button

*/

private Button getButton2() {

if (button2 == null) {

button2 = new Button("乘");

button2.setBounds(new Rectangle(134, 91, 71, 29));

button2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

awn=Double.valueOf(textField.getText()) * Double.valueOf(textField1.getText());

label.setText(String.format("%.6f",awn));

}

catch(Exception ex){

return;

}}

});

}

return button2;

}/**

* This method initializes button3

*

* @return java.awt.Button

*/

private Button getButton3() {

if (button3 == null) {

button3 = new Button("除");

button3.setBounds(new Rectangle(134, 133, 71, 29));

button3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

awn=Double.valueOf(textField.getText()) / Double.valueOf(textField1.getText());

label.setText(String.format("%.6f",awn));

}

catch(Exception ex){

return;

}}

});

}

return button3;

}

public static void main(String[] args)

{

new suanfa().setVisible(true);

}

}

java点击菜单项弹出窗口怎么弄

代码缺一行：

。。。

authorTextArea.setPreferredSize(new Dimension(40, 80));

authorFrame.add(authorTextArea);

。。。

以上完了后，需要加一个

authorFrame.setVisible(true);

至于这个框的大小，你再调调哈，相互学习~，三年没做过了~

java的菜单代码怎么写？

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class MyMenu extends JFrame{

JMenuBar jmbar=new JMenuBar();

JMenu jmenu=new JMenu("颜色");

JMenuItem jmt1=new JMenuItem("红色"),

jmt2=new JMenuItem("黄色"),

jmt3=new JMenuItem("蓝色");

JPanel jp=new JPanel();

MyMenu(){

setTitle("菜单测试");

setSize(400,300);

setJMenuBar(jmbar);

jmbar.add(jmenu);

jmenu.add(jmt1);

jmenu.add(jmt2);

jmenu.add(jmt3);

add(jp);

jmt1.addActionListener(new MenuAction(this));

jmt2.addActionListener(new MenuAction(this));

jmt3.addActionListener(new MenuAction(this));

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

}

public static void main(String[] args) {

new MyMenu();

}

}

class MenuAction implements ActionListener{

MyMenu m;

MenuAction(MyMenu m){

this.m=m;

}

public void actionPerformed(ActionEvent e){

String color=e.getActionCommand();

if(color=="红色")m.jp.setBackground(Color.red);

else if(color=="黄色")m.jp.setBackground(Color.yellow);

else if(color=="蓝色")m.jp.setBackground(Color.blue);

}

}

不知道你要什么事件代码，我写了个比较简单的你看适合不。

如何给Java窗体添加菜单栏

以windows系统中的记事本为例，菜单栏中的【文件】，【编辑】等全部叫一个菜单条；在Java中用JMenuBar表示；

菜单条中每一个具体的项叫做一个菜单，在Java中用JMenu表示；

菜单中的每一项叫做菜单项，Java中用JMenuItem表示；

我们在窗体中创建菜单栏，首先需要创建菜单条，先声明，然后在构造方法中初始化；代码为：JMenuBar bar = new JMenuBar();

然后创建菜单，也菜单条一样，也是先声明，再new；代码为：JMenu menu = new JMenu("文件");

接下来创建菜单项，和上面的一样，先声明，再new；代码为：JMenuItem item = new JMenuItem("新建");

创建好每一个部分之后，我们需要将菜单项添加到菜单中，然后将菜单添加到菜单条中；代码为：

menu.add(item);

bar.add(menu);

然后将整个菜单条添加到窗体中，代码为：

this.setJMenuBar(bar);

这样就可以实现在窗体中添加菜单条了，看一下效果吧。

用JAVA程序设计一个记事本形式的菜单窗体

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.awt.datatransfer.*;

class MyMenuBar extends MenuBar{

public MyMenuBar(Frame parent){

parent.setMenuBar(this);

}

public void addMenus(String [] menus){

for(int i=0;imenus.length;i++)

add(new Menu(menus[i]));

}

public void addMenuItems(int menuNumber,String[] items){

for(int i=0;iitems.length;i++){

if(items[i]!=null)

getMenu(menuNumber).add(new MenuItem(items[i]));

else getMenu(menuNumber).addSeparator();

}

}

public void addActionListener(ActionListener al){

for(int i=0;igetMenuCount();i++)

for(int j=0;jgetMenu(i).getItemCount();j++)

getMenu(i).getItem(j).addActionListener(al);

}

}

class MyFile{

private FileDialog fDlg;

public MyFile(Frame parent){

fDlg=new FileDialog(parent,"",FileDialog.LOAD);

}

private String getPath(){

return fDlg.getDirectory()+"\\"+fDlg.getFile();

}

public String getData() throws IOException{

fDlg.setTitle("打开");

fDlg.setMode(FileDialog.LOAD);

fDlg.setVisible(true);

BufferedReader br=new BufferedReader(new FileReader(getPath()));

StringBuffer sb=new StringBuffer();

String aline;

while((aline=br.readLine())!=null)

sb.append(aline+'\n');

br.close();

return sb.toString();

}

public void setData(String data) throws IOException{

fDlg.setTitle("保存");

fDlg.setMode(FileDialog.SAVE);

fDlg.setVisible(true);

BufferedWriter bw=new BufferedWriter(new FileWriter(getPath()));

bw.write(data);

bw.close();

}

}

class MyClipboard{

private Clipboard cb;

public MyClipboard(){

cb=Toolkit.getDefaultToolkit().getSystemClipboard();

}

public void setData(String data){

cb.setContents(new StringSelection(data),null);

}

public String getData(){

Transferable content=cb.getContents(null);

try{

return (String) content.getTransferData(DataFlavor.stringFlavor);

//DataFlavor.stringFlavor会将剪贴板中的字符串转换成Unicode码形式的String对象。

//DataFlavor类是与存储在剪贴板上的数据的形式有关的类。

}catch(Exception ue){}

return null;

}

}

class MyFindDialog extends Dialog implements ActionListener{

private Label lFind=new Label("查找字符串");

private Label lReplace=new Label("替换字符串");

private TextField tFind=new TextField(10);

private TextField tReplace=new TextField(10);

private Button bFind=new Button("查找");

private Button bReplace=new Button("替换");

private TextArea ta;

public MyFindDialog(Frame owner,TextArea ta){

super(owner,"查找",false);

this.ta=ta;

setLayout(null);

lFind.setBounds(10,30,80,20);

lReplace.setBounds(10,70,80,20);

tFind.setBounds(90,30,90,20);

tReplace.setBounds(90,70,90,20);

bFind.setBounds(190,30,80,20);

bReplace.setBounds(190,70,80,20);

add(lFind);

add(tFind);

add(bFind);

add(lReplace);

add(tReplace);

add(bReplace);

setResizable(false);

bFind.addActionListener(this);

bReplace.addActionListener(this);

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

MyFindDialog.this.dispose();

}

});

}//构造函数结束

public void showFind(){

setTitle("查找");

setSize(280,60);

setVisible(true);

}

public void showReplace(){

setTitle("查找替换");

setSize(280,110);

setVisible(true);

}

private void find(){

String text=ta.getText();

String str=tFind.getText();

int end=text.length();

int len=str.length();

int start=ta.getSelectionEnd();

if(start==end) start=0;

for(;start=end-len;start++){

if(text.substring(start,start+len).equals(str)){

ta.setSelectionStart(start);

ta.setSelectionEnd(start+len);

return;

}

}

//若找不到待查字符串，则将光标置于末尾

ta.setSelectionStart(end);

ta.setSelectionEnd(end);

}

public Button getBFind() {

return bFind;

}

private void replace(){

String str=tReplace.getText();

if(ta.getSelectedText().equals(tFind.getText()))

ta.replaceRange(str,ta.getSelectionStart(),ta.getSelectionEnd());

else find();

}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==bFind)

find();

else if(e.getSource()==bReplace)

replace();

}

}

public class MyMemo extends Frame implements ActionListener{

private TextArea editor=new TextArea(); //可编辑的TextArea

private MyFile mf=new MyFile(this);//MyFile对象

private MyClipboard cb=new MyClipboard();

private MyFindDialog findDlg=new MyFindDialog(this,editor);

public MyMemo(String title){ //构造函数

super(title);

MyMenuBar mb=new MyMenuBar(this);

//添加需要的菜单及菜单项

mb.addMenus(new String[]{"文件","编辑","查找","帮助"});

mb.addMenuItems(0,new String[]{"新建","打开","保存",null,"全选"});

mb.addMenuItems(1,new String[]{"剪贴","复制","粘贴","清除",null,"全选"});

mb.addMenuItems(2,new String[]{"查找",null,"查找替换"});

mb.addMenuItems(3,new String[]{"我的记事本信息"});

add(editor); //为菜单项注册动作时间监听器

mb.addActionListener(this);

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

MyMemo.this.dispose();

}

}); //分号不能忘了

} //构造函数完

public void actionPerformed(ActionEvent e){

String selected=e.getActionCommand(); //获取菜单项标题

if(selected.equals("新建"))

editor.setText("");

else if(selected.equals("打开")){

try{

editor.setText(mf.getData());

}catch(IOException ie){}

}

else if(selected.equals("保存")){

try{

mf.setData(editor.getText());

}catch(IOException ie){}

}

else if(selected.equals("退出")){

dispose();

}

else if(selected.equals("剪贴")){

//将选中的字符串复制到剪贴板中并清除字符串

cb.setData(editor.getSelectedText());

editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd());

}

else if(selected.equals("复制")){

cb.setData(editor.getSelectedText());

}

else if(selected.equals("粘贴")){

String str=cb.getData();

editor.replaceRange(str,editor.getSelectionStart(),editor.getSelectionEnd());

//粘贴在光标位置

}

else if(selected.equals("清除")){

editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd());

}

else if(selected.equals("全选")){

editor.setSelectionStart(0);

editor.setSelectionEnd(editor.getText().length());

}

else if(selected.equals("查找")){

findDlg.showFind();

}

else if(selected.equals("查找替换")){

findDlg.showReplace();

}

}

public static void main(String[] args){

MyMemo memo=new MyMemo("记事本");

memo.setSize(650,450);

memo.setVisible(true);

}

}

当前标题：java菜单窗体源代码,java窗体菜单栏
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