Example usage for java.util Collection isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:Main.java

/**
 * return collection is empty//from  w w w .  j a v a2 s  .  c  o  m
 * @param c
 * @return
 */
public static <E> boolean isEmpty(Collection<E> c) {
    return (null == c || c.isEmpty());
}

From source file:Main.java

/** Returns a new array or null if collection is empty */
public static <T> T[] toArray(Collection<T> c) {
    return c.isEmpty() ? null : toArray(c, c.iterator().next().getClass());
}

From source file:Main.java

public static boolean isEmpty(Collection<?> collection) {
    return (collection == null) || collection.isEmpty();
}

From source file:Main.java

/**
 * Returns the first item in the collection or null if the collection is empty
 *///from  w  ww  .j ava2s .  co m
public static <X> X getFirstItem(Collection<X> c) {
    X o;
    if (c == null || c.isEmpty()) {
        o = null;
    } else if (c instanceof List) {
        o = ((List<X>) c).get(0);
    } else {
        o = c.iterator().next();
    }
    return o;
}

From source file:Main.java

static boolean isEmpty(final Collection<?> collection) {
    return collection == null || collection.isEmpty();
}

From source file:Main.java

public static boolean isEmptyOrNull(Collection<?> collection) {
    return null == collection || collection.isEmpty();
}

From source file:Main.java

public static boolean isNotEmptyOrNull(Collection<?> collection) {
    return null != collection && !collection.isEmpty();
}

From source file:Main.java

public static <T> boolean isEmpty(Collection<? extends T> collections) {
    return collections == null || collections.isEmpty();
}

From source file:Main.java

public static Boolean isEmpty(Collection<?> collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

/**
 * //from ww w. j a  va  2  s .c  o  m
 * @Title: isEmpty
 * @author:  wuwh 
 *
 * <p>check collection is empty</p>
 *
 * <pre>
 * CollectionUtil.isEmpty(null)   = true
 * Map.put("ddd","ddd");
 * CollectionUtil.isEmpty(Map)=false
 * </pre>
 *
 */
public static boolean isEmpty(Collection collection) {
    return null != collection && !collection.isEmpty() ? false : true;
}