如何看JButton源代码?需要下载什么,到哪里下载?
解决方案 »
- java中的方法可以不写返回值类型吗?
- 新提问,有关JAVA中数据初始化的问题
- String 转 Integer 这么小的程序还有异常??
- 如何用Java将PDF/RTF批量转TXT文件
- Java读取文件时如何每次都读到最新的内容
- 以前写的,方便swing使用的子程序集,顺带散分
- 一个servlet小程序编译问题
- 如何在类外面捕捉由该类生成的对象?
- 为何JAVA连接SQL出错,SQL的驱动我也设置了
- 一个DatagramSocket程序,为什么会报错?
- 怎样让Jfilechoose显示指定扩展名的文件?
- 高难度,我觉得/JTree下面的节点是个JTable,怎么实现右键菜单获取当前TABLE的内容/
下面是我jdk1.5的源代码
/*
* @(#)JButton.java 1.97 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.swing;import java.util.EventListener;import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;import javax.swing.plaf.*;
import javax.swing.event.*;
import javax.accessibility.*;import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
/**
* An implementation of a "push" button.
* See <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/button.html">How to Use Buttons, Check Boxes, and Radio Buttons</a>
* in <em>The Java Tutorial</em>
* for information and examples of using buttons.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @beaninfo
* attribute: isContainer false
* description: An implementation of a \"push\" button.
*
* @version 1.97 12/19/03
* @author Jeff Dinkins
*/
public class JButton extends AbstractButton implements Accessible { /**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "ButtonUI"; /**
* Creates a button with no set text or icon.
*/
public JButton() {
this(null, null);
}
/**
* Creates a button with an icon.
*
* @param icon the Icon image to display on the button
*/
public JButton(Icon icon) {
this(null, icon);
}
/**
* Creates a button with text.
*
* @param text the text of the button
*/
public JButton(String text) {
this(text, null);
}
/**
* Creates a button where properties are taken from the
* <code>Action</code> supplied.
*
* @param a the <code>Action</code> used to specify the new button
*
* @since 1.3
*/
public JButton(Action a) {
this();
setAction(a);
} /**
* Creates a button with initial text and an icon.
*
* @param text the text of the button
* @param icon the Icon image to display on the button
*/
public JButton(String text, Icon icon) {
// Create the model
setModel(new DefaultButtonModel()); // initialize
init(text, icon);
} /**
* Resets the UI property to a value from the current look and
* feel.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((ButtonUI)UIManager.getUI(this));
}
/**
* Returns a string that specifies the name of the L&F class
* that renders this component.
*
* @return the string "ButtonUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
* @beaninfo
* expert: true
* description: A string that specifies the name of the L&F class.
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Gets the value of the <code>defaultButton</code> property,
* which if <code>true</code> means that this button is the current
* default button for its <code>JRootPane</code>.
* Most look and feels render the default button
* differently, and may potentially provide bindings
* to access the default button.
*
* @return the value of the <code>defaultButton</code> property
* @see JRootPane#setDefaultButton
* @see #isDefaultCapable
* @beaninfo
* description: Whether or not this button is the default button
*/
public boolean isDefaultButton() {
JRootPane root = SwingUtilities.getRootPane(this);
if (root != null) {
return root.getDefaultButton() == this;
}
return false;
}
* Gets the value of the <code>defaultCapable</code> property.
*
* @return the value of the <code>defaultCapable</code> property
* @see #setDefaultCapable
* @see #isDefaultButton
* @see JRootPane#setDefaultButton
*/
public boolean isDefaultCapable() {
return defaultCapable;
} /**
* Sets the <code>defaultCapable</code> property,
* which determines whether this button can be
* made the default button for its root pane.
* The default value of the <code>defaultCapable</code>
* property is <code>true</code> unless otherwise
* specified by the look and feel.
*
* @param defaultCapable <code>true</code> if this button will be
* capable of being the default button on the
* <code>RootPane</code>; otherwise <code>false</code>
* @see #isDefaultCapable
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: Whether or not this button can be the default button
*/
public void setDefaultCapable(boolean defaultCapable) {
boolean oldDefaultCapable = this.defaultCapable;
this.defaultCapable = defaultCapable;
firePropertyChange("defaultCapable", oldDefaultCapable, defaultCapable);
} /**
* Overrides <code>JComponent.removeNotify</code> to check if
* this button is currently set as the default button on the
* <code>RootPane</code>, and if so, sets the <code>RootPane</code>'s
* default button to <code>null</code> to ensure the
* <code>RootPane</code> doesn't hold onto an invalid button reference.
*/
public void removeNotify() {
JRootPane root = SwingUtilities.getRootPane(this);
if (root != null && root.getDefaultButton() == this) {
root.setDefaultButton(null);
}
super.removeNotify();
} /**
* Factory method which sets the <code>AbstractButton</code>'s properties
* according to values from the <code>Action</code> instance.
* The properties which get set may differ for <code>AbstractButton</code>
* subclasses. By default, the properties which get set are
* <code>Text, Icon, Enabled, ToolTipText, ActionCommand</code>, and
* <code>Mnemonic</code>.
*
* @param a the <code>Action</code> from which to get the
* properties, or <code>null</code>
* @since 1.3
* @see Action
* @see #setAction
*/
protected void configurePropertiesFromAction(Action a) {
super.configurePropertiesFromAction(a);
} /**
* See readObject() and writeObject() in JComponent for more
* information about serialization in Swing.
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
/**
* Returns a string representation of this <code>JButton</code>.
* This method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be <code>null</code>.
*
* @return a string representation of this <code>JButton</code>
*/
protected String paramString() {
String defaultCapableString = (defaultCapable ? "true" : "false");
return super.paramString() +
",defaultCapable=" + defaultCapableString;
}
/////////////////
// Accessibility support
//////////////// /**
* Gets the <code>AccessibleContext</code> associated with this
* <code>JButton</code>. For <code>JButton</code>s,
* the <code>AccessibleContext</code> takes the form of an
* <code>AccessibleJButton</code>.
* A new <code>AccessibleJButton</code> instance is created if necessary.
*
* @return an <code>AccessibleJButton</code> that serves as the
* <code>AccessibleContext</code> of this <code>JButton</code>
* @beaninfo
* expert: true
* description: The AccessibleContext associated with this Button.
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJButton();
}
return accessibleContext;
} /**
* This class implements accessibility support for the
* <code>JButton</code> class. It provides an implementation of the
* Java Accessibility API appropriate to button user-interface
* elements.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
protected class AccessibleJButton extends AccessibleAbstractButton {
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.PUSH_BUTTON;
}
} // inner class AccessibleJButton
}