Example usage for java.util List size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this list.

Usage

From source file:Main.java

public static String joinSelectionCriteria(List<String> input) {
    if (input.size() == 0) {
        return null;
    }//from  w  ww  .ja v a2s  .  c om
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < input.size(); i++) {
        if (i > 0) {
            sb.append(" AND ");
        }
        sb.append(input.get(i));
    }
    return sb.toString();
}

From source file:Main.java

public static <T> List<T> takeLast(List<T> list, int length) {
    if (list.size() > length) {
        int fromIndex = Math.max(0, list.size() - length);
        int toIndex = list.size();
        List<T> newList = new ArrayList<T>();
        newList.addAll(list.subList(fromIndex, toIndex));
        return newList;
    }/*ww  w  .j a  v  a 2 s .c om*/
    return list;
}

From source file:Main.java

public static <E> E sample(List<E> l, Random r) {
    int i = r.nextInt(l.size());
    return l.get(i);
}

From source file:Main.java

/**
 * Creates defensive copy of list if/*from  w ww  .  j av a 2 s .com*/
 * @param list source list to be copied.
 * @param <T> type of list.
 * @return defensive copy of non-empty list or empty List.
 */
public static <T> List<T> defensiveCopy(List<T> list) {
    return list != null && list.size() > 0 ? new ArrayList<>(list) : new ArrayList<>();
}

From source file:Main.java

public static <T> boolean isNotEmpty(List<T> list) {
    return (list != null && list.size() != 0);
}

From source file:Main.java

/**
 * Return the first item of <code>l</code> if it's the only one, otherwise <code>null</code>.
 * // ww  w  .  ja v  a  2  s  . c  om
 * @param <T> type of list.
 * @param l the list.
 * @return the first item of <code>l</code> or <code>null</code>.
 */
public static <T> T getSole(List<T> l) {
    return l.size() == 1 ? l.get(0) : null;
}

From source file:Main.java

public static <T> boolean isEmpty(List<T> list) {
    return (list != null && list.size() == 0);
}

From source file:Main.java

public static <T> List<T> toImmutableList(List<T> list) {
    switch (list.size()) {
    case 0:// w w w .  j av  a2s  .  c  o  m
        return Collections.emptyList();
    case 1:
        return Collections.singletonList(list.get(0));
    default:
        return Collections.unmodifiableList(list);
    }
}

From source file:Main.java

public static <T> boolean IsListEmpty(final List<T> list) {
    return list == null || list.size() == 0;
}

From source file:Main.java

public static byte[] toByteArray(List<Byte> list) {
    byte[] ret = new byte[list.size()];
    for (int i = 0; i < ret.length; i++)
        ret[i] = list.get(i);//from  w w  w. j av a 2 s  . co  m
    return ret;
}