Example usage for java.util List get

Introduction

In this page you can find the example usage for java.util List get.

Prototype

E get(int index);

Source Link

Document

Returns the element at the specified position in this list.

Usage

From source file:Main.java

public static <E> Optional<E> max(List<E> elements, Comparator<E> comparator) {
    if (elements.size() != 0) {
        E maxElement = elements.get(0);
        for (int i = 1; i < elements.size(); i++) {
            maxElement = comparator.compare(maxElement, elements.get(i)) > 0 ? maxElement : elements.get(i);
        }//from  w ww.  j a  va 2s  . c o  m
        return Optional.of(maxElement);
    } else
        return Optional.empty();
}

From source file:Main.java

/**
 * Returns the first found frame of {@code #findFramesWithIcons()}. <p> Especially for usage in a
 * <code>JOptionPane#show...Dialog()</code> instead of null. Then in the dialog frame an icon will be displayed that
 * is different to the Java "coffee cup" icon.
 *
 * @return frame or null/*  w w  w.j a va 2s  .  c om*/
 */
public static Frame findFrameWithIcon() {
    List<Frame> frames = findFramesWithIcons();

    return (frames.isEmpty()) ? null : frames.get(0);
}

From source file:Main.java

public static <T> T getFirstElement(List<T> liste) {
    if (isEmpty(liste)) {
        return null;
    } else {//w  w  w. j av  a2s  . com
        return liste.get(0);
    }
}

From source file:Main.java

public static Object[] toArrayOnListOfSameType(List aList) {
    if (aList.isEmpty())
        return new Object[0];

    Class type = aList.get(0).getClass();
    Object[] sameElementsArray = (Object[]) Array.newInstance(type, aList.size());
    return aList.toArray(sameElementsArray);
}

From source file:Main.java

public static <T> List<T> reversedView(final List<T> list) {
    return new AbstractList<T>() {
        @Override//from ww w .ja va 2 s . co  m
        public T get(int index) {
            return list.get(list.size() - 1 - index);
        }

        @Override
        public int size() {
            return list.size();
        }
    };
}

From source file:Main.java

public static float getMedian(List<Float> values) {
    Collections.sort(values);//from  w  w  w. ja  va 2 s.  co m
    if (values.size() % 2 == 0) {
        return (values.get(values.size() / 2 - 1) + values.get(values.size() / 2)) / 2;
    } else {
        return values.get(values.size() / 2);
    }
}

From source file:Main.java

public static String getRandomTAG(List<String> list) {
    Random random = new Random();
    int i = random.nextInt(list.size());
    return list.get(i);
}

From source file:Main.java

public static <T> T tryToGet2ndElement(List<T> list) {
    int size = list.size();
    long id = 0;//from  w ww .  j a v  a 2  s. c  o m
    if (size < 2) {
        return list.get(0);
    } else {
        return list.get(1);
    }
}

From source file:Main.java

public static void printMapList(List<Map> list) {
    Map map = null;/*from   w w w  . j  a  va2 s.  c  o  m*/
    for (int i = 0; i < list.size(); i++) {
        map = list.get(i);
        Iterator iter = map.entrySet().iterator();
        while (iter.hasNext()) {
            Map.Entry entry = (Map.Entry) iter.next();
            System.out.println(entry.getKey() + ": " + entry.getValue());
        }
    }
}

From source file:Main.java

public static Double getMinElement(List<Double> list) {
    Double min = 10000d;//from   w  ww  .java  2 s. c  o  m
    for (int i = 0; i < list.size(); i++) {
        if (list.get(i).compareTo(min) < 0) {
            min = list.get(i);
        }
    }
    return min;
}