Example usage for java.lang Class getDeclaredMethod

Introduction

In this page you can find the example usage for java.lang Class getDeclaredMethod.

Prototype

@CallerSensitive
public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
        throws NoSuchMethodException, SecurityException

Source Link

Document

Returns a Method object that reflects the specified declared method of the class or interface represented by this Class object.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    Class c = Class.forName("MyClass");
    Method m = c.getDeclaredMethod("say", new Class[] { String.class, String.class });
    Object i = c.newInstance();/*from   w  w  w . j  a v  a2s .co m*/
    Object r = m.invoke(i, new Object[] { "Hello", "World" });
}

From source file:Main.java

public static void main(String[] args) {

    Main cls = new Main();
    Class c = cls.getClass();

    try {//  w w  w .  ja v a  2  s .  c o  m
        Method m = c.getDeclaredMethod("show", null);
        System.out.println("method = " + m.toString());

        // method Integer
        Class[] cArg = new Class[1];
        cArg[0] = Integer.class;
        Method lMethod = c.getDeclaredMethod("showInteger", cArg);
        System.out.println("method = " + lMethod.toString());
    } catch (NoSuchMethodException e) {
        System.out.println(e.toString());
    }
}

From source file:MethodTroubleReturns.java

public static void main(String... args) {
    try {//from w  w w  .j  ava2 s  .c  om
        MethodTroubleReturns mtr = new MethodTroubleReturns();
        Class<?> c = mtr.getClass();
        Method m = c.getDeclaredMethod("drinkMe", int.class);
        m.invoke(mtr, -1);

        // production code should handle these exceptions more gracefully
    } catch (InvocationTargetException x) {
        Throwable cause = x.getCause();
        System.err.format("drinkMe() failed: %s%n", cause.getMessage());
    } catch (Exception x) {
        x.printStackTrace();
    }
}

From source file:Main.java

public static void main(String... args) {
    try {/*w  ww. j  av a  2  s  .com*/
        Class<?> c = Class.forName(args[0]);
        Class[] argTypes = new Class[] { String[].class };
        Method main = c.getDeclaredMethod("main", argTypes);
        String[] mainArgs = Arrays.copyOfRange(args, 1, args.length);
        System.out.format("invoking %s.main()%n", c.getName());
        main.invoke(null, (Object) mainArgs);

        // production code should handle these exceptions more gracefully
    } catch (ClassNotFoundException x) {
        x.printStackTrace();
    } catch (NoSuchMethodException x) {
        x.printStackTrace();
    } catch (IllegalAccessException x) {
        x.printStackTrace();
    } catch (InvocationTargetException x) {
        x.printStackTrace();
    }
}

From source file:org.apache.commons.net.examples.Main.java

/**
 * Helper application for example classes.
 * Lists available classes, and provides shorthand invocation.
 * For example:<br>/*w  w w  .j  a  va  2  s .co m*/
 * <code>java -jar commons-net-examples-m.n.jar FTPClientExample -l host user password</code>
 *
 * @param args the first argument is used to name the class; remaining arguments
 * are passed to the target class.
 * @throws Throwable if an error occurs
 */
public static void main(String[] args) throws Throwable {
    final Properties fp = new Properties();
    final InputStream ras = Main.class.getResourceAsStream("examples.properties");
    if (ras != null) {
        fp.load(ras);
    } else {
        System.err.println("[Cannot find examples.properties file, so aliases cannot be used]");
    }
    if (args.length == 0) {
        if (Thread.currentThread().getStackTrace().length > 2) { // called by Maven
            System.out.println("Usage: mvn -q exec:java  -Dexec.arguments=<alias or"
                    + " exampleClass>,<exampleClass parameters> (comma-separated, no spaces)");
            System.out.println("Or   : mvn -q exec:java  -Dexec.args=\"<alias"
                    + " or exampleClass> <exampleClass parameters>\" (space separated)");
        } else {
            if (fromJar()) {
                System.out.println(
                        "Usage: java -jar commons-net-examples-m.n.jar <alias or exampleClass> <exampleClass parameters>");
            } else {
                System.out.println(
                        "Usage: java -cp target/classes examples/Main <alias or exampleClass> <exampleClass parameters>");
            }
        }
        @SuppressWarnings("unchecked") // property names are Strings
        List<String> l = (List<String>) Collections.list(fp.propertyNames());
        if (l.isEmpty()) {
            return;
        }
        Collections.sort(l);
        System.out.println("\nAliases and their classes:");
        for (String s : l) {
            System.out.printf("%-25s %s%n", s, fp.getProperty(s));
        }
        return;
    }

    String shortName = args[0];
    String fullName = fp.getProperty(shortName);
    if (fullName == null) {
        fullName = shortName;
    }
    fullName = fullName.replace('/', '.');
    try {
        Class<?> clazz = Class.forName(fullName);
        Method m = clazz.getDeclaredMethod("main", new Class[] { args.getClass() });
        String[] args2 = new String[args.length - 1];
        System.arraycopy(args, 1, args2, 0, args2.length);
        try {
            m.invoke(null, (Object) args2);
        } catch (InvocationTargetException ite) {
            Throwable cause = ite.getCause();
            if (cause != null) {
                throw cause;
            } else {
                throw ite;
            }
        }
    } catch (ClassNotFoundException e) {
        System.out.println(e);
    }
}

From source file:it.doqui.index.ecmengine.test.AllTests.java

public static void main(String[] args) {
    Log logger = LogFactory.getLog(ECMENGINE_TEST_LOG_CATEGORY);
    logger.debug("[AllTests::main] BEGIN");
    String runner;//www.  j  av a 2s  . c o m
    int i;
    String arguments[];
    Class cls;

    runner = null;
    for (i = 0; (i < args.length) && (null == runner); i++) {
        if (args[i].equalsIgnoreCase("-text"))
            runner = "junit.textui.TestRunner";
        else if (args[i].equalsIgnoreCase("-awt"))
            runner = "junit.awtui.TestRunner";
        else if (args[i].equalsIgnoreCase("-swing"))
            runner = "junit.swingui.TestRunner";
    }
    if (null != runner) {
        // remove it from the arguments
        arguments = new String[args.length - 1];
        System.arraycopy(args, 0, arguments, 0, i - 1);
        System.arraycopy(args, i, arguments, i - 1, args.length - i);
        args = arguments;
    } else
        runner = "junit.swingui.TestRunner";

    // append the test class
    arguments = new String[args.length + 1];
    System.arraycopy(args, 0, arguments, 0, args.length);
    arguments[args.length] = "it.doqui.index.ecmengine.test.AllTests";

    // invoke main() of the test runner
    try {
        cls = Class.forName(runner);
        java.lang.reflect.Method method = cls.getDeclaredMethod("main", new Class[] { String[].class });
        method.invoke(null, new Object[] { arguments });
    } catch (Throwable t) {
        logger.debug("[AllTests::main] Problem in test execution : " + t);
    } finally {
        logger.debug("[AllTests::main] BEGIN");

    }
}

From source file:Main.java

public static boolean objectHasEquals(Class clazz) {
    try {/*from w  ww  . j  a  v  a 2s.com*/
        clazz.getDeclaredMethod("equals", Object.class);
        return true;
    } catch (NoSuchMethodException e) {
    }
    //If no exception thrown, then the method exists!
    return false;
}

From source file:Main.java

public static Method getPrivateMethod(Object target, String methodName, Class<?>... parameterTypes)
        throws NoSuchMethodException {
    Class targetClass = target.getClass();
    Method method = targetClass.getDeclaredMethod(methodName, parameterTypes);
    method.setAccessible(true);/*from w  w  w.  ja  va  2  s .  c  o  m*/
    return method;
}

From source file:Main.java

public static boolean hasMethod(String className, String methodName, Class<?>... parameterTypes) {
    try {/*w  w w.j a  v  a2s  .  c  om*/
        Class<?> klass = Class.forName(className);
        klass.getDeclaredMethod(methodName, parameterTypes);
        return true;
    } catch (Throwable th) {
        return false;
    }
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static Method getStaticMethod(Class clazz, String methodName, Class args[]) {
    try {// w w w.  j  a va 2  s.  c o  m
        Method method = clazz.getDeclaredMethod(methodName, args);
        if ((method.getModifiers() & Modifier.STATIC) != 0)
            return method;
    } catch (NoSuchMethodException ex) {
    }
    return null;
}