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

@Nullable
public static String[] nullableArrayOfStrings(@Nullable List<String> list) {
    return list == null || list.isEmpty() ? null : list.toArray(new String[list.size()]);
}

From source file:Main.java

public static boolean isEmpty(List list) {
    if (list == null || list.isEmpty()) {
        return true;
    } else {//from w w w  . j a  va  2  s . c  om
        return false;
    }
}

From source file:Main.java

private static <T> T remove(List<T> list, int position) {
    if (list.isEmpty()) {
        return null;
    }/*from   ww w. j  ava  2 s.  c  o  m*/
    return list.remove(position);
}

From source file:Main.java

public static Double listSum(List<Double> list) {
    if (list == null || list.isEmpty()) {
        return null;
    }/* w  w w  .ja  v  a 2s .  co  m*/

    Double sum = 0.0;

    for (Double value : list) {
        sum += value;
    }

    return sum;
}

From source file:Main.java

/**
 * //  w  w w  .  j a  v a  2s.  c  o  m
 * Internal method to check if a tuple sequence contains sequences or only
 * atomic values.
 * 
 * @param <E>
 *            the type of contained items
 * @param sequence
 *            the sequence
 * @return <code>true</code> if sequence has to atomfiy, <code>false</code>
 *         otherwise
 */
private static <E extends Object> boolean hasToAtomify(List<E> sequence) {
    if (sequence.isEmpty()) {
        return false;
    }
    for (E obj : sequence) {
        if (obj instanceof List<?>) {
            return true;
        }
    }
    return false;
}

From source file:Main.java

public static <T> T zeroOrOne(List<? extends T> items) {
    return items == null || items.isEmpty() ? null : items.get(0);
}

From source file:Main.java

private static <T> T remove(List<T> list, int position) {
    if (list.isEmpty())
        return null;
    return list.remove(position);
}

From source file:Main.java

public static String listToString(List<String> weeks) {
    if (weeks == null || weeks.isEmpty()) {
        return "";
    }/* ww w .  j  a v  a  2s.c  o m*/
    StringBuffer result = new StringBuffer();
    for (String week : weeks) {
        result.append(week).append(",");
    }
    if (result.length() != 0) {
        result.deleteCharAt(result.length() - 1);
    }
    return result.toString();
}

From source file:Main.java

public static <T> List<T> nonNullFrom(List<T> list) {
    if (list == null || list.isEmpty()) {
        return Collections.emptyList();
    }// w w w . j  a v a 2  s . c  om
    return Collections.unmodifiableList(list);
}

From source file:Main.java

public static <T> T getFirst(List<T> list) {
    T t = null;// w  w w.ja v a2 s  .  c om
    if (list != null && !list.isEmpty()) {
        t = list.get(0);
    }
    return t;
}