问个JUNIT语法的问题

/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package android.os.cts;

import android.content.Context;
import android.os.Vibrator;
import android.test.AndroidTestCase;
import android.util.Log;
import dalvik.annotation.TestTargets;
import dalvik.annotation.TestTargetNew;
import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetClass;

@TestTargetClass(Vibrator.class)
public class VibratorTest extends AndroidTestCase {

private Vibrator mVibrator;

@Override
protected void setUp() throws Exception {
super.setUp();
mVibrator = (Vibrator) getContext().getSystemService(Context.VIBRATOR_SERVICE);
}

@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test cancel()",
method = "cancel",
args = {}
)
public void testVibratorCancel() {
try {
mVibrator.vibrate(1000);
} catch (Exception e) {
fail("testVibratorCancel failed!");
}
sleep();
try {
mVibrator.cancel();
} catch (Exception e) {
fail("testVibratorCancel failed!");
}
}

@TestTargets({
@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test vibrate",
method = "vibrate",
args = {long[].class, int.class}
),
@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test vibrate",
method = "vibrate",
args = {long.class}
)
})
public void testVibratePattern() {
long[] pattern = {100, 200, 400, 800, 1600};
try {
mVibrator.vibrate(pattern, 3);
} catch (Exception e) {
fail("vibrate failed!");
}
try {
mVibrator.vibrate(pattern, 10);
fail("Should throw ArrayIndexOutOfBoundsException");
} catch (ArrayIndexOutOfBoundsException e) {
}
sleep();
}

@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test vibrator with multi thread.",
method = "vibrate",
args = {long.class}
)
public void testVibrateMultiThread() {
Log.d("*******VibratorTest", "MultiTreadTest");
new Thread(new Runnable() {
public void run() {
Log.d("*******VibratorTest", "Thread 1");
try {
mVibrator.vibrate(100);
} catch (Exception e) {
fail("MultiThread fail1");
}
}
}).start();
new Thread(new Runnable() {
public void run() {
Log.d("*******VibratorTest", "Thread 2");
try {
// This test only get two threads to run vibrator at the same time
// for a functional test,
// but it can not verify if the second thread get the precedence.
mVibrator.vibrate(1000);
} catch (Exception e) {
fail("MultiThread fail2");
}
}
}).start();
sleep();
}

private void sleep() {
try {
Thread.sleep(10000);
} catch (Exception e) {
}
}
}





问个低级的问题：下面这段是什么意思呀？ @TestTargets是什么意思呀？
@TestTargets({
@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test vibrate",
method = "vibrate",
args = {long[].class, int.class}
),
@TestTargetNew(
level = TestLevel.COMPLETE,
notes = "Test vibrate",
method = "vibrate",
args = {long.class}
)
})