Example usage for java.util List isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this list contains no elements.

Usage

From source file:Main.java

/**
 * Return the last item of the {@code List}. Null is returned if the list is null or empty.
 *
 * @param <T> Type of the items in the list
 * @param list Input list/*  www .  j  ava  2 s. com*/
 * @return Last item of the list or null if the list is empty
 */
public static <T> T getLast(List<T> list) {
    if (list == null || list.isEmpty()) {
        return null;
    }

    return list.get(list.size() - 1);
}

From source file:Main.java

static String getKSessionName(List<String> kSessions) {
    if (kSessions == null || kSessions.isEmpty()) {
        return null;
    } else {//from ww w. ja  v a  2s  .  c o m
        return kSessions.iterator().next();
    }
}

From source file:Main.java

public static <T> List<T> mergeAll(List<T>... lists) {
    List<T> mergedList = new ArrayList<T>();
    for (int i = 0, len = lists.length; i < len; i++) {
        List<T> list = lists[i];
        if (list != null && !list.isEmpty()) {
            for (int j = 0, lenj = list.size(); j < lenj; j++) {
                T obj = list.get(j);/* w ww  . j a v  a  2s .c o m*/
                if (obj != null) {
                    mergedList.add(obj);
                }
            }
        }
    }
    return mergedList;
}

From source file:Main.java

public static final <T> List<List<T>> devide(List<T> origin, int size) {
    if (origin == null || origin.isEmpty() || size <= 0) {
        return Collections.emptyList();
    }// w  ww.  j a  v a2 s . co  m

    final int block = origin.size() / size + (origin.size() % size > 0 ? 1 : 0);

    List<List<T>> devidedList = new ArrayList<List<T>>(block);
    for (int i = 0; i < block; i++) {
        final int start = i * size;
        final int end = Math.min(start + size, origin.size());
        devidedList.add(new ArrayList<T>(origin.subList(start, end)));
    }
    return devidedList;
}

From source file:Main.java

public static <T> T last(List<T> list) {
    if (list == null || list.isEmpty()) {
        return null;
    }/*from w  w w. j av a2s.c  o m*/
    return list.get(list.size() - 1);
}

From source file:Main.java

public static <T> T getFirst(Map<String, List<T>> multiValutMap, String key) {
    List<T> values = multiValutMap.get(key);
    if (values != null && !values.isEmpty())
        return values.get(0);
    return null;//from ww  w .  j  a  v a2  s.co  m
}

From source file:Main.java

public static String toString(List<String> permission) {
    if (permission == null || permission.isEmpty()) {
        return "";
    }//from w ww .  j  ava2s .  co m

    return toString(permission.toArray(new String[permission.size()]));
}

From source file:Main.java

public static boolean isBackgroundRunning(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }//  w  ww .j  av a2  s.  c o m
    }
    return false;
}

From source file:Main.java

public static boolean isApplicationBroughtToBackground(final Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }/*from  w w w  .  ja  v  a 2s  . c  o  m*/
    }
    return false;
}

From source file:Main.java

public static boolean isEmpty(List<?> list) {
    if (list == null)
        return true;
    return list.isEmpty();
}