Java Class 类 getDeclaredMethods()方法及示例
Class类getDeclaredMethods()方法
getDeclaredMethods()方法在java.lang包中可用。
getDeclaredMethods()方法用于返回表示所有方法的方法对象数组（即，方法是私有方法，公共方法，受保护方法还是默认方法），但不包括继承的方法。
getDeclaredMethods()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
返回方法对象数组时，getDeclaredMethods()方法可能会引发异常。
SecurityException：在此异常中，当安全管理器存在时可能会引发此异常。
语法：
public Method[] getDeclaredMethods();
参数：
它不接受任何参数。
返回值：
此方法的返回类型为Method[]，它返回一个Method对象数组，该对象表示此类中所有已声明的方法（不包括继承的Methods）。
注意：
当类或接口不包含方法时，将返回0。
当此类对象包含基本类型，数组类或void类型时，将返回0。
示例
//Java程序演示示例
//Method[]getDeclaredMethods()
//类的方法
import java.lang.reflect.*;
public class GetDeclaredMethodsOfClass {
public static void main(String[] args) throws Exception {
Thread th = new Thread();
//获取String的Class对象
Class cl = th.getClass();
//调用线程类方法
Method[] methods = cl.getDeclaredMethods();
for (int i = 0; i < methods.length; ++i) {
System.out.print("String Class Methods = ");
System.out.println(methods[i].toString());
}
}
}输出结果
String Class Methods = public void java.lang.Thread.run() String Class Methods = private void java.lang.Thread.exit() String Class Methods = private void java.lang.Thread.dispatchUncaughtException(java.lang.Throwable) String Class Methods = public java.lang.String java.lang.Thread.toString() String Class Methods = protected java.lang.Object java.lang.Thread.clone() throws java.lang.CloneNotSupportedException String Class Methods = public boolean java.lang.Thread.isInterrupted() String Class Methods = private native boolean java.lang.Thread.isInterrupted(boolean) String Class Methods = public static native java.lang.Thread java.lang.Thread.currentThread() String Class Methods = public static void java.lang.Thread.onSpinWait() String Class Methods = private static native void java.lang.Thread.registerNatives() String Class Methods = public final java.lang.String java.lang.Thread.getName() String Class Methods = public final void java.lang.Thread.join() throws java.lang.InterruptedException String Class Methods = public final synchronized void java.lang.Thread.join(long,int) throws java.lang.InterruptedException String Class Methods = public final synchronized void java.lang.Thread.join(long) throws java.lang.InterruptedException String Class Methods = public final java.lang.ThreadGroup java.lang.Thread.getThreadGroup() String Class Methods = public void java.lang.Thread.setContextClassLoader(java.lang.ClassLoader) String Class Methods = public java.lang.StackTraceElement[] java.lang.Thread.getStackTrace() String Class Methods = public static native boolean java.lang.Thread.holdsLock(java.lang.Object) String Class Methods = public final void java.lang.Thread.checkAccess() String Class Methods = public static void java.lang.Thread.dumpStack() String Class Methods = public final void java.lang.Thread.setPriority(int) String Class Methods = public final void java.lang.Thread.setDaemon(boolean) String Class Methods = public synchronized void java.lang.Thread.start() String Class Methods = private static synchronized int java.lang.Thread.nextThreadNum() String Class Methods = private static synchronized long java.lang.Thread.nextThreadID() String Class Methods = static void java.lang.Thread.blockedOn(sun.nio.ch.Interruptible) String Class Methods = public static native void java.lang.Thread.yield() String Class Methods = public static void java.lang.Thread.sleep(long,int) throws java.lang.InterruptedException String Class Methods = public static native void java.lang.Thread.sleep(long) throws java.lang.InterruptedException String Class Methods = private native void java.lang.Thread.start0() String Class Methods = public final void java.lang.Thread.stop() String Class Methods = public void java.lang.Thread.interrupt() String Class Methods = public static boolean java.lang.Thread.interrupted() String Class Methods = public final native boolean java.lang.Thread.isAlive() String Class Methods = public final void java.lang.Thread.suspend() String Class Methods = public final void java.lang.Thread.resume() String Class Methods = public final int java.lang.Thread.getPriority() String Class Methods = public final synchronized void java.lang.Thread.setName(java.lang.String) String Class Methods = public static int java.lang.Thread.activeCount() String Class Methods = public static int java.lang.Thread.enumerate(java.lang.Thread[]) String Class Methods = public native int java.lang.Thread.countStackFrames() String Class Methods = public final boolean java.lang.Thread.isDaemon() String Class Methods = public java.lang.ClassLoader java.lang.Thread.getContextClassLoader() String Class Methods = public static java.util.Map java.lang.Thread.getAllStackTraces() String Class Methods = private static boolean java.lang.Thread.isCCLOverridden(java.lang.Class) String Class Methods = private static boolean java.lang.Thread.auditSubclass(java.lang.Class) String Class Methods = private static native java.lang.StackTraceElement[][] java.lang.Thread.dumpThreads(java.lang.Thread[]) String Class Methods = private static native java.lang.Thread[] java.lang.Thread.getThreads() String Class Methods = public long java.lang.Thread.getId() String Class Methods = public java.lang.Thread$State java.lang.Thread.getState() String Class Methods = public static void java.lang.Thread.setDefaultUncaughtExceptionHandler(java.lang.Thread$UncaughtExceptionHandler) String Class Methods = public static java.lang.Thread$UncaughtExceptionHandler java.lang.Thread.getDefaultUncaughtExceptionHandler() String Class Methods = public java.lang.Thread$UncaughtExceptionHandler java.lang.Thread.getUncaughtExceptionHandler() String Class Methods = public void java.lang.Thread.setUncaughtExceptionHandler(java.lang.Thread$UncaughtExceptionHandler) String Class Methods = static void java.lang.Thread.processQueue(java.lang.ref.ReferenceQueue,java.util.concurrent.ConcurrentMap) String Class Methods = private native void java.lang.Thread.setPriority0(int) String Class Methods = private native void java.lang.Thread.stop0(java.lang.Object) String Class Methods = private native void java.lang.Thread.suspend0() String Class Methods = private native void java.lang.Thread.resume0() String Class Methods = private native void java.lang.Thread.interrupt0() String Class Methods = private native void java.lang.Thread.setNativeName(java.lang.String)