Java 類 getMethods() 方法

描述

Java 類 getMethods() 方法返回一個包含 Method 物件的陣列，這些物件反映了此 Class 物件所表示的類或介面的所有公共成員方法，包括由類或介面宣告的方法以及從超類和超介面繼承的方法。

如果此 Class 物件表示一個沒有公共成員方法的類或介面，或者此 Class 物件表示一個基本型別或 void，則該方法返回一個長度為 0 的陣列。

宣告

以下是 java.lang.Class.getMethods() 方法的宣告

public Method[] getMethods() throws SecurityException

引數

無

返回值

此方法返回表示此類的公共方法的 Method 物件陣列。

異常

SecurityException - 如果存在安全管理器 s。

獲取類的所有方法示例

以下示例演示了 java.lang.Class.getMethods() 方法的用法。在此程式中，我們建立了一個 ClassDemo 的例項，然後使用 getClass() 方法檢索該例項的類。現在使用 getMethods()，我們檢索了所有方法並列印了它們。

package com.tutorialspoint;

import java.lang.reflect.Method;

public class ClassDemo {

   public static void main(String[] args) {

      try {
         ClassDemo cls = new ClassDemo();
         Class c = cls.getClass();
         System.out.println("Methods =");
      
         /* returns the array of Method objects representing the public 
            methods of this class */
         Method m[] = c.getMethods();
         for(int i = 0; i < m.length; i++) {
            System.out.println(m[i]);
         }
      } catch (Exception e) {
         System.out.println("Exception: " + e);
      }
   }
   public Integer show() {
      return 1;
   }
    
   public void showLong(Long l) {
      this.l = l;
   }
   long l = 78655;
} 

輸出

讓我們編譯並執行上述程式，這將產生以下結果：

Methods =
public static void com.tutorialspoint.ClassDemo.main(java.lang.String[])
public java.lang.Integer com.tutorialspoint.ClassDemo.show()
public void com.tutorialspoint.ClassDemo.showLong(java.lang.Long)
public boolean java.lang.Object.equals(java.lang.Object)
public java.lang.String java.lang.Object.toString()
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()
public final 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

獲取執行緒的所有方法示例

以下示例演示了 java.lang.Class.getMethods() 方法的用法。在此程式中，我們檢索了 Thread 的類。現在使用 getMethods()，我們檢索了所有方法並列印了它們。

package com.tutorialspoint;

import java.lang.reflect.Method;

public class ClassDemo {

   public static void main(String[] args) {

      try {
         Class cls = Thread.class;
         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);
      }
   }
} 

輸出

讓我們編譯並執行上述程式，這將產生以下結果：

Methods =
public final java.lang.String java.lang.Thread.getName()
public java.lang.StackTraceElement[] java.lang.Thread.getStackTrace()
public void java.lang.Thread.run()
public void java.lang.Thread.interrupt()
public java.lang.String java.lang.Thread.toString()
public static native java.lang.Thread java.lang.Thread.currentThread()
public static void java.lang.Thread.onSpinWait()
public final boolean java.lang.Thread.isVirtual()
public final void java.lang.Thread.join(long) throws java.lang.InterruptedException
public final void java.lang.Thread.join(long,int) throws java.lang.InterruptedException
public final void java.lang.Thread.join() throws java.lang.InterruptedException
public final boolean java.lang.Thread.join(java.time.Duration) throws java.lang.InterruptedException
public void java.lang.Thread.setContextClassLoader(java.lang.ClassLoader)
public final java.lang.ThreadGroup java.lang.Thread.getThreadGroup()
public final void java.lang.Thread.checkAccess()
public static void java.lang.Thread.dumpStack()
public final void java.lang.Thread.setPriority(int)
public final void java.lang.Thread.setDaemon(boolean)
public void java.lang.Thread.start()
public java.lang.ClassLoader java.lang.Thread.getContextClassLoader()
public final int java.lang.Thread.getPriority()
public final boolean java.lang.Thread.isDaemon()
public static boolean java.lang.Thread.interrupted()
public static int java.lang.Thread.activeCount()
public static int java.lang.Thread.enumerate(java.lang.Thread[])
public final boolean java.lang.Thread.isAlive()
public final long java.lang.Thread.threadId()
public static void java.lang.Thread.setDefaultUncaughtExceptionHandler(java.lang.Thread$UncaughtExceptionHandler)
public java.lang.Thread$UncaughtExceptionHandler java.lang.Thread.getUncaughtExceptionHandler()
public static void java.lang.Thread.yield()
public static void java.lang.Thread.sleep(long,int) throws java.lang.InterruptedException
public static void java.lang.Thread.sleep(java.time.Duration) throws java.lang.InterruptedException
public static void java.lang.Thread.sleep(long) throws java.lang.InterruptedException
public static java.lang.Thread$Builder$OfPlatform java.lang.Thread.ofPlatform()
public static java.lang.Thread$Builder$OfVirtual java.lang.Thread.ofVirtual()
public static java.lang.Thread java.lang.Thread.startVirtualThread(java.lang.Runnable)
public final void java.lang.Thread.stop()
public boolean java.lang.Thread.isInterrupted()
public final void java.lang.Thread.suspend()
public final void java.lang.Thread.resume()
public final synchronized void java.lang.Thread.setName(java.lang.String)
public int java.lang.Thread.countStackFrames()
public static native boolean java.lang.Thread.holdsLock(java.lang.Object)
public static java.util.Map java.lang.Thread.getAllStackTraces()
public long java.lang.Thread.getId()
public java.lang.Thread$State java.lang.Thread.getState()
public static java.lang.Thread$UncaughtExceptionHandler java.lang.Thread.getDefaultUncaughtExceptionHandler()
public void java.lang.Thread.setUncaughtExceptionHandler(java.lang.Thread$UncaughtExceptionHandler)
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()
public final 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

獲取標籤的所有方法示例

以下示例演示了 java.lang.Class.getMethods() 方法的用法。在此程式中，我們檢索了 java.awt.label 的類。現在使用 getMethods()，我們檢索了所有方法並列印了它們。

package com.tutorialspoint;

import java.lang.reflect.Method;

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);
      }
   }
} 

輸出

讓我們編譯並執行上述程式，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()