Java Class class getDeclaredMethods() method with example

Class class getDeclaredMethods() method: Here, we are going to learn about the getDeclaredMethods() method of Class class with its syntax and example.
Submitted by Preeti Jain, on November 19, 2019

Class class getDeclaredMethods() method

getDeclaredMethods() method is available in java.lang package.
getDeclaredMethods() method is used to return an array of Method objects that indicate all the Methods (i.e. whether it is private, public, protected, or default) but it does not include inherited methods.
getDeclaredMethods() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
getDeclaredMethods() method may throw an exception at the time of returning an array of Method objects.
SecurityException: In this exception, it may raise when the security manager exists.

Syntax:

    public Method[] getDeclaredMethods();

Parameter(s):

It does not accept any parameter.

Return value:

The return type of this method is Method[], it returns an array of Method object denoting all the declared method of this class excluding inherited Methods.

Note:

When class or interface does not contain methods, 0 is returned.
When this class object holds primitive, an array class, or void type, 0 is returned.

Example:

// Java program to demonstrate the example 
// of Method[] getDeclaredMethods () 
// method of Class 

import java.lang.reflect.*;

public class GetDeclaredMethodsOfClass {
    public static void main(String[] args) throws Exception {
        Thread th = new Thread();

        // Get Class object of String
        Class cl = th.getClass();

        // Calling Thread Class Methods
        Method[] methods = cl.getDeclaredMethods();

        for (int i = 0; i < methods.length; ++i) {
            System.out.print("String Class Methods = ");
            System.out.println(methods[i].toString());
        }
    }
}

Output

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)

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