Java Java.lang.Class.getMethods()用法及代碼示例

描述

這個java.lang.Class.getMethods()返回一個包含 Method 對象的數組，該對象反映了此 Class 對象表示的類或接口的所有公共成員方法，包括由類或接口聲明的方法以及從超類和超接口繼承的方法。

如果此 Class 對象表示沒有公共成員方法的類或接口，或者此 Class 對象表示基本類型或 void，則該方法返回長度為 0 的數組。

聲明

以下是聲明java.lang.Class.getMethods()方法

public Method[] getMethods() throws SecurityException

參數

NA

返回值

此方法返回表示此類公共方法的 Method 對象數組。

異常

SecurityException- 如果有安全管理器 s 存在。

示例

下麵的例子展示了 java.lang.Class.getMethods() 方法的用法。

package com.tutorialspoint;

import java.lang.reflect.*;

public class ClassDemo {

   public static void main(String[] args) {

      try {
         Class cls = Class.forName("java.awt.Label");
         System.out.println("Methods =");
      
         /* returns the array of Method objects representing the public 
            methods of this class */
         Method m[] = cls.getMethods();
         for(int i = 0; i < m.length; i++) {
            System.out.println(m[i]);
         }
      } catch (Exception e) {
         System.out.println("Exception:" + e);
      }
   }
}

讓我們編譯並運行上麵的程序，這將產生以下結果——

Methods =
public void java.awt.Label.addNotify()
public int java.awt.Label.getAlignment()
public synchronized void java.awt.Label.setAlignment(int)
public java.lang.String java.awt.Label.getText()
public void java.awt.Label.setText(java.lang.String)
public javax.accessibility.AccessibleContext java.awt.Label.getAccessibleContext()
public void java.awt.Component.add(java.awt.PopupMenu)
public java.lang.String java.awt.Component.toString()
public java.lang.String java.awt.Component.getName()
public java.awt.Dimension java.awt.Component.size()
public boolean java.awt.Component.contains(int,int)
public boolean java.awt.Component.contains(java.awt.Point)
public java.awt.Container java.awt.Component.getParent()
public java.awt.Point java.awt.Component.getLocation()
public java.awt.Point java.awt.Component.getLocation(java.awt.Point)
public void java.awt.Component.remove(java.awt.MenuComponent)
public void java.awt.Component.setName(java.lang.String)
public void java.awt.Component.list()
public void java.awt.Component.list(java.io.PrintStream)
public void java.awt.Component.list(java.io.PrintStream,int)
public void java.awt.Component.list(java.io.PrintWriter)
public void java.awt.Component.list(java.io.PrintWriter,int)
public void java.awt.Component.print(java.awt.Graphics)
public java.awt.Dimension java.awt.Component.getSize()
public java.awt.Dimension java.awt.Component.getSize(java.awt.Dimension)
public void java.awt.Component.resize(int,int)
public void java.awt.Component.resize(java.awt.Dimension)
public boolean java.awt.Component.action(java.awt.Event,java.lang.Object)
public void java.awt.Component.setSize(int,int)
public void java.awt.Component.setSize(java.awt.Dimension)
public void java.awt.Component.update(java.awt.Graphics)
public boolean java.awt.Component.isOpaque()
public void java.awt.Component.enable()
public void java.awt.Component.enable(boolean)
public void java.awt.Component.disable()
public java.awt.Point java.awt.Component.location()
public final java.lang.Object java.awt.Component.getTreeLock()
public java.awt.Toolkit java.awt.Component.getToolkit()
public java.awt.peer.ComponentPeer java.awt.Component.getPeer()
public synchronized void java.awt.Component.setDropTarget(java.awt.dnd.DropTarget)
public synchronized java.awt.dnd.DropTarget java.awt.Component.getDropTarget()
public java.awt.GraphicsConfiguration java.awt.Component.getGraphicsConfiguration()
public boolean java.awt.Component.isValid()
public boolean java.awt.Component.isDisplayable()
public boolean java.awt.Component.isVisible()
public java.awt.Point java.awt.Component.getMousePosition() throws java.awt.HeadlessException
public boolean java.awt.Component.isShowing()
public boolean java.awt.Component.isEnabled()
public void java.awt.Component.setEnabled(boolean)
public boolean java.awt.Component.isDoubleBuffered()
public void java.awt.Component.enableInputMethods(boolean)
public void java.awt.Component.setVisible(boolean)
public void java.awt.Component.show()
public void java.awt.Component.show(boolean)
public void java.awt.Component.hide()
public java.awt.Color java.awt.Component.getForeground()
public void java.awt.Component.setForeground(java.awt.Color)
public boolean java.awt.Component.isForegroundSet()
public java.awt.Color java.awt.Component.getBackground()
public void java.awt.Component.setBackground(java.awt.Color)
public boolean java.awt.Component.isBackgroundSet()
public java.awt.Font java.awt.Component.getFont()
public void java.awt.Component.setFont(java.awt.Font)
public boolean java.awt.Component.isFontSet()
public java.util.Locale java.awt.Component.getLocale()
public void java.awt.Component.setLocale(java.util.Locale)
public java.awt.image.ColorModel java.awt.Component.getColorModel()
public java.awt.Point java.awt.Component.getLocationOnScreen()
public void java.awt.Component.setLocation(int,int)
public void java.awt.Component.setLocation(java.awt.Point)
public void java.awt.Component.move(int,int)
public java.awt.Rectangle java.awt.Component.getBounds()
public java.awt.Rectangle java.awt.Component.getBounds(java.awt.Rectangle)
public java.awt.Rectangle java.awt.Component.bounds()
public void java.awt.Component.setBounds(int,int,int,int)
public void java.awt.Component.setBounds(java.awt.Rectangle)
public void java.awt.Component.reshape(int,int,int,int)
public int java.awt.Component.getX()
public int java.awt.Component.getY()
public int java.awt.Component.getWidth()
public int java.awt.Component.getHeight()
public boolean java.awt.Component.isLightweight()
public void java.awt.Component.setPreferredSize(java.awt.Dimension)
public java.awt.Dimension java.awt.Component.preferredSize()
public boolean java.awt.Component.isPreferredSizeSet()
public java.awt.Dimension java.awt.Component.getPreferredSize()
public void java.awt.Component.setMinimumSize(java.awt.Dimension)
public java.awt.Dimension java.awt.Component.minimumSize()
public boolean java.awt.Component.isMinimumSizeSet()
public java.awt.Dimension java.awt.Component.getMinimumSize()
public void java.awt.Component.setMaximumSize(java.awt.Dimension)
public boolean java.awt.Component.isMaximumSizeSet()
public java.awt.Dimension java.awt.Component.getMaximumSize()
public float java.awt.Component.getAlignmentX()
public float java.awt.Component.getAlignmentY()
public int java.awt.Component.getBaseline(int,int)
public java.awt.Component$BaselineResizeBehavior java.awt.Component.getBaselineResizeBehavior()
public void java.awt.Component.doLayout()
public void java.awt.Component.layout()
public void java.awt.Component.validate()
public void java.awt.Component.invalidate()
public java.awt.Graphics java.awt.Component.getGraphics()
public java.awt.FontMetrics java.awt.Component.getFontMetrics(java.awt.Font)
public void java.awt.Component.setCursor(java.awt.Cursor)
public java.awt.Cursor java.awt.Component.getCursor()
public boolean java.awt.Component.isCursorSet()
public void java.awt.Component.paint(java.awt.Graphics)
public void java.awt.Component.paintAll(java.awt.Graphics)
public void java.awt.Component.repaint()
public void java.awt.Component.repaint(long)
public void java.awt.Component.repaint(int,int,int,int)
public void java.awt.Component.repaint(long,int,int,int,int)
public void java.awt.Component.printAll(java.awt.Graphics)
public boolean java.awt.Component.imageUpdate(java.awt.Image,int,int,int,int,int)
public java.awt.Image java.awt.Component.createImage(java.awt.image.ImageProducer)
public java.awt.Image java.awt.Component.createImage(int,int)
public java.awt.image.VolatileImage java.awt.Component.createVolatileImage(int,int)
public java.awt.image.VolatileImage java.awt.Component.createVolatileImage(int,int,java.awt.ImageCapabilities) throws java.awt.AWTException
public boolean java.awt.Component.prepareImage(java.awt.Image,java.awt.image.ImageObserver)
public boolean java.awt.Component.prepareImage
(java.awt.Image,int,int,java.awt.image.ImageObserver)
public int java.awt.Component.checkImage(java.awt.Image,java.awt.image.ImageObserver)
public int java.awt.Component.checkImage
(java.awt.Image,int,int,java.awt.image.ImageObserver)
public void java.awt.Component.setIgnoreRepaint(boolean)
public boolean java.awt.Component.getIgnoreRepaint()
public boolean java.awt.Component.inside(int,int)
public java.awt.Component java.awt.Component.getComponentAt(int,int)
public java.awt.Component java.awt.Component.getComponentAt(java.awt.Point)
public java.awt.Component java.awt.Component.locate(int,int)
public void java.awt.Component.deliverEvent(java.awt.Event)
public final void java.awt.Component.dispatchEvent(java.awt.AWTEvent)
public boolean java.awt.Component.postEvent(java.awt.Event)
public synchronized void java.awt.Component.addComponentListener(java.awt.event.ComponentListener)
public synchronized void java.awt.Component.removeComponentListener(java.awt.event.ComponentListener)
public synchronized java.awt.event.ComponentListener[] java.awt.Component.getComponentListeners()
public synchronized void java.awt.Component.addFocusListener(java.awt.event.FocusListener)
public synchronized void java.awt.Component.removeFocusListener(java.awt.event.FocusListener)
public synchronized java.awt.event.FocusListener[] java.awt.Component.getFocusListeners()
public void java.awt.Component.addHierarchyListener(java.awt.event.HierarchyListener)
public void java.awt.Component.removeHierarchyListener(java.awt.event.HierarchyListener)
public synchronized java.awt.event.HierarchyListener[] java.awt.Component.getHierarchyListeners()
public void java.awt.Component.addHierarchyBoundsListener
(java.awt.event.HierarchyBoundsListener)
public void java.awt.Component.removeHierarchyBoundsListener
(java.awt.event.HierarchyBoundsListener)
public synchronized java.awt.event.HierarchyBoundsListener[] java.awt.Component.getHierarchyBoundsListeners()
public synchronized void java.awt.Component.addKeyListener(java.awt.event.KeyListener)
public synchronized void java.awt.Component.removeKeyListener(java.awt.event.KeyListener)
public synchronized java.awt.event.KeyListener[] java.awt.Component.getKeyListeners()
public synchronized void java.awt.Component.addMouseListener(java.awt.event.MouseListener)
public synchronized void java.awt.Component.removeMouseListener(java.awt.event.MouseListener)
public synchronized java.awt.event.MouseListener[] java.awt.Component.getMouseListeners()
public synchronized void java.awt.Component.addMouseMotionListener(java.awt.event.MouseMotionListener)
public synchronized void java.awt.Component.removeMouseMotionListener
(java.awt.event.MouseMotionListener)
public synchronized java.awt.event.MouseMotionListener[] java.awt.Component.getMouseMotionListeners()
public synchronized void java.awt.Component.addMouseWheelListener(java.awt.event.MouseWheelListener)
public synchronized void java.awt.Component.removeMouseWheelListener(java.awt.event.MouseWheelListener)
public synchronized java.awt.event.MouseWheelListener[] java.awt.Component.getMouseWheelListeners()
public synchronized void java.awt.Component.addInputMethodListener(java.awt.event.InputMethodListener)
public synchronized void java.awt.Component.removeInputMethodListener
(java.awt.event.InputMethodListener)
public synchronized java.awt.event.InputMethodListener[] java.awt.Component.getInputMethodListeners()
public java.util.EventListener[] java.awt.Component.getListeners(java.lang.Class)
public java.awt.im.InputMethodRequests java.awt.Component.getInputMethodRequests()
public java.awt.im.InputContext java.awt.Component.getInputContext()
public boolean java.awt.Component.handleEvent(java.awt.Event)
public boolean java.awt.Component.mouseDown(java.awt.Event,int,int)
public boolean java.awt.Component.mouseDrag(java.awt.Event,int,int)
public boolean java.awt.Component.mouseUp(java.awt.Event,int,int)
public boolean java.awt.Component.mouseMove(java.awt.Event,int,int)
public boolean java.awt.Component.mouseEnter(java.awt.Event,int,int)
public boolean java.awt.Component.mouseExit(java.awt.Event,int,int)
public boolean java.awt.Component.keyDown(java.awt.Event,int)
public boolean java.awt.Component.keyUp(java.awt.Event,int)
public void java.awt.Component.removeNotify()
public boolean java.awt.Component.gotFocus(java.awt.Event,java.lang.Object)
public boolean java.awt.Component.lostFocus(java.awt.Event,java.lang.Object)
public boolean java.awt.Component.isFocusTraversable()
public boolean java.awt.Component.isFocusable()
public void java.awt.Component.setFocusable(boolean)
public void java.awt.Component.setFocusTraversalKeys(int,java.util.Set)
public java.util.Set java.awt.Component.getFocusTraversalKeys(int)
public boolean java.awt.Component.areFocusTraversalKeysSet(int)
public void java.awt.Component.setFocusTraversalKeysEnabled(boolean)
public boolean java.awt.Component.getFocusTraversalKeysEnabled()
public void java.awt.Component.requestFocus()
public boolean java.awt.Component.requestFocusInWindow()
public java.awt.Container java.awt.Component.getFocusCycleRootAncestor()
public boolean java.awt.Component.isFocusCycleRoot(java.awt.Container)
public void java.awt.Component.transferFocus()
public void java.awt.Component.nextFocus()
public void java.awt.Component.transferFocusBackward()
public void java.awt.Component.transferFocusUpCycle()
public boolean java.awt.Component.hasFocus()
public boolean java.awt.Component.isFocusOwner()
public void java.awt.Component.addPropertyChangeListener(java.beans.PropertyChangeListener)
public void java.awt.Component.addPropertyChangeListener
(java.lang.String,java.beans.PropertyChangeListener)
public void java.awt.Component.removePropertyChangeListener
(java.beans.PropertyChangeListener)
public void java.awt.Component.removePropertyChangeListener
(java.lang.String,java.beans.PropertyChangeListener)
public java.beans.PropertyChangeListener[] java.awt.Component.getPropertyChangeListeners()
public java.beans.PropertyChangeListener[] java.awt.Component.getPropertyChangeListeners(java.lang.String)
public void java.awt.Component.firePropertyChange(java.lang.String,byte,byte)
public void java.awt.Component.firePropertyChange(java.lang.String,char,char)
public void java.awt.Component.firePropertyChange(java.lang.String,short,short)
public void java.awt.Component.firePropertyChange(java.lang.String,long,long)
public void java.awt.Component.firePropertyChange(java.lang.String,float,float)
public void java.awt.Component.firePropertyChange(java.lang.String,double,double)
public void java.awt.Component.setComponentOrientation(java.awt.ComponentOrientation)
public java.awt.ComponentOrientation java.awt.Component.getComponentOrientation()
public void java.awt.Component.applyComponentOrientation(java.awt.ComponentOrientation)
public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException
public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException
public final void java.lang.Object.wait() throws java.lang.InterruptedException
public boolean java.lang.Object.equals(java.lang.Object)
public native int java.lang.Object.hashCode()
public final native java.lang.Class java.lang.Object.getClass()
public final native void java.lang.Object.notify()
public final native void java.lang.Object.notifyAll()