import lejos.hardware.Key; //导入依赖的package包/类
@Test
public void testEqualsAndHashCode() {
    final EV3Key enterKey = new EV3Key(EV3Key.BUTTON_LEFT);

    // intentionally calling Assert.assertEquals(EV3Key.equals(...)) to demonstrate better what we're testing
    Assert.assertFalse(enterKey.equals(null));
    Assert.assertFalse(enterKey.equals(enterKey.getId()));  // comparison with integer intentionally doesn't work as it's ambiguous (id vs. Key.* constants vs. Keys.ID_* constants)
    Assert.assertTrue(enterKey.equals(enterKey));
    Assert.assertTrue(enterKey.equals(new EV3Key(EV3Key.BUTTON_LEFT)));
    Assert.assertTrue(enterKey.equals(new EV3Key(EV3Key.KeyType.LEFT)));
    Assert.assertFalse(enterKey.equals(new EV3Key(EV3Key.KeyType.RIGHT)));
    Assert.assertTrue(enterKey.equals(new TestKey(EV3Key.BUTTON_LEFT)));
    Assert.assertFalse(enterKey.equals(new TestKey(EV3Key.BUTTON_RIGHT)));

    final Set<Key> uniqueKeys = new HashSet<>();
    uniqueKeys.add(enterKey);
    uniqueKeys.add(new EV3Key(EV3Key.KeyType.LEFT));
    uniqueKeys.add(new EV3Key(EV3Key.BUTTON_LEFT));
    Assert.assertEquals(1, uniqueKeys.size());
}
 

import lejos.hardware.Key; //导入依赖的package包/类
public static void main(String[] args) {

        brick = BrickFinder.getDefault();
        GraphicsLCD g = brick.getGraphicsLCD();
        Key enter = brick.getKey("Escape");
        String[] sensorName = new String[4];
        p[0] = brick.getPort("S1");
        p[1] = brick.getPort("S2");
        p[2] = brick.getPort("S3");
        p[3] = brick.getPort("S4");

        while ( enter.isUp() ) {
            uDetected = false;
            for ( int i = 0; i < sensorName.length; i++ ) {
                sensorName[i] = getSensorName(i);
            }
            g.clear();
            g.drawString("ESCAPE to quit", 0, 100, 0, true);
            g.setFont(Font.getSmallFont());
            g.drawString("B.", 165, 105, 0);
            g.setFont(Font.getDefaultFont());
            for ( int i = 0; i < sensorName.length; i++ ) {
                g.drawString("Port " + (i + 1) + ": " + sensorName[i], 0, i * 20 + 20, 0);
            }
            if ( !uDetected ) {
                Delay.msDelay(100);
            }
        }
    }
 

import lejos.hardware.Key; //导入依赖的package包/类
/**
 * @param obj
 * @return true if the {@code obj} is an instance of {@link Key} and if the button IDs are the same.
 */
@Override
public boolean equals(final Object obj) {
    if (obj == null || ! (obj instanceof Key)) {
        return false;
    } else if (obj == this) {  // pointer comparison
        return true;
    } else {
        return ((int)this.keyType.getId() == ((Key)obj).getId());
    }
}
 

import lejos.hardware.Key; //导入依赖的package包/类
private static void broadcastToListeners(final KeyType keyType, final BiConsumer<KeyListener, Key> notificationMethod) {
    keyListeners.get(keyType).forEach((listener) -> notificationMethod.accept(listener, new EV3Key(keyType)));      // key-specific listeners
    keyListeners.get(KeyType.ALL).forEach((listener) -> notificationMethod.accept(listener, new EV3Key(keyType)));  // all-key listeners
    synchronized (keyEventReader) {
        keyEventReader.notifyAll();
    }
}
 

import lejos.hardware.Key; //导入依赖的package包/类
@Override
public void keyPressed(Key key) {
    this.keyEvents.add(Pair.of(key, KeyEvent.PRESSED));
}
 

import lejos.hardware.Key; //导入依赖的package包/类
@Override
public void keyReleased(Key key) {
    this.keyEvents.add(Pair.of(key, KeyEvent.RELEASED));
}
 

import lejos.hardware.Key; //导入依赖的package包/类
SimpleEV3Button(Key delegate, EV3ScriptContext sc) {
  this.delegate = delegate;
  this.sc = sc;
}