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

public static boolean isTopApp(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> TaskList = am.getRunningTasks(2);
    if (TaskList == null || TaskList.isEmpty()) {
        return false;
    }//from w w w  .ja  va2s. c  o  m
    RunningTaskInfo rti = TaskList.get(0);
    String tmp = rti.topActivity.getPackageName();
    return tmp.equals(context.getPackageName());
}

From source file:Main.java

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

    return false;
}

From source file:Main.java

/**
 * This API is to get the lowest value from a List. The input objects need
 * to implement Comparable.//from  w w  w .  j a v  a  2  s .  com
 * 
 * 
 * @param <T>
 *            The type of the object the input list can contain and also the
 *            return type of the method
 * @param list
 * @return
 * @author sabuj.das
 */
public static <T extends Comparable<T>> T lowestValue(List<T> list) {
    if (list == null || list.isEmpty()) {
        return null;
    }
    Collections.sort(list);
    return list.get(0);
}

From source file:Main.java

public static <T> boolean emptyList(List<T> list) {
    if (list == null) {
        return true;
    }//from   w w w  .java  2 s.co  m
    if (list.isEmpty()) {
        return true;
    }
    return false;
}

From source file:Main.java

public static <T> T last(List<T> collection) {
    if (collection == null || collection.isEmpty()) {
        return null;
    }//from ww  w . j a  v  a  2  s. co  m
    return collection.get(collection.size() - 1);

}

From source file:Main.java

public static <T> List<T> assertNotNullOrNotEmpty(List<T> reference, @Nullable Object errorMessage) {
    if (reference == null || reference.isEmpty()) {
        throw new IllegalArgumentException(String.valueOf(errorMessage));
    }/*from w  w w.j ava2 s .  co m*/
    return reference;
}

From source file:Main.java

public static <T> boolean isSubset(List<T> subList, List<T> list) {
    if (subList == null || list == null || subList.isEmpty() || list.isEmpty()) {
        return false;
    }//from  w w w  .  j a va  2  s  .c  o  m
    List<T> subList1 = new ArrayList();
    subList1.addAll(subList);

    for (T t : list) {
        if (subList1.contains(t)) {
            subList1.remove(t);
        }
    }
    if (subList1.isEmpty()) {
        return true;
    }
    return false;
}

From source file:Main.java

/**
 * //w ww  .  j  a v  a2 s. c  o  m
 * @param <T>
 * @param list
 * @return
 */
public static <T extends Comparable<T>> T getLowerMiddleValue(List<T> list) {
    if (null == list || list.isEmpty())
        return null;
    Collections.sort(list);
    return list.get((list.size() - 1) / 2);
}

From source file:Main.java

public static String listToString(List<String> list, String delimiter) {
    if (list == null || list.isEmpty()) {
        return "";
    }/*  ww w  .  j  a  v a  2  s.  c  o m*/
    final StringBuilder builder = new StringBuilder();
    boolean first = true;
    for (String s : list) {
        if (first) {
            first = false;
        } else {
            builder.append(delimiter);
        }
        builder.append(s);
    }
    return builder.toString();
}

From source file:Main.java

/**
 * Generates permutations from a list of collections. Each permutation contains an element
 * from each of the collections. //from w  w w .  ja v  a 2 s.  co m
 * 
 * @param <T>         the generic type for object in the collections
 * @param collections   the list of collections
 * @return            the collection of permutations
 */
public static <T> Collection<List<T>> generatePermutations(List<Collection<T>> collections) {
    if (collections == null || collections.isEmpty()) {
        return Collections.emptyList();
    } else {
        Collection<List<T>> res = new LinkedList<List<T>>();
        permutationsImpl(collections, res, 0, new LinkedList<T>());
        return res;
    }
}