Example usage for java.util Collections singletonMap

Introduction

In this page you can find the example usage for java.util Collections singletonMap.

Prototype

public static <K, V> Map<K, V> singletonMap(K key, V value)

Source Link

Document

Returns an immutable map, mapping only the specified key to the specified value.

Usage

From source file:Main.java

public static void main(String[] a) {
    // create singleton map
    Map<String, String> map = Collections.singletonMap("key", "Value");

    System.out.println("Singleton map is: " + map);
}

From source file:MainClass.java

public static void main(String[] a) {
    System.out.println(Collections.singletonList("a"));
    System.out.println(Collections.singleton("a"));
    System.out.println(Collections.singletonMap("a", "b"));

}

From source file:Main.java

public static <K, V> Map<K, V> map1(K key, V value) {
    return Collections.singletonMap(key, value);
}

From source file:Maps.java

public static <K, V> Map<K, V> create(K key, V value) {
    return Collections.singletonMap(key, value);
}

From source file:Main.java

public static <K, V> Entry<K, V> mapEntry(K key, V value) {
    return Collections.singletonMap(key, value).entrySet().iterator().next();
}

From source file:Main.java

/**
 * Create a map with one key and a corresponding value.
 *
 * @param key0 the key//from ww w  . ja  v a 2s.  co  m
 * @param value0 the value
 * @param <K> key type
 * @param <V> value type
 * @return map with one entry
 */
public static <K, V> Map<K, V> map(K key0, V value0) {
    return Collections.singletonMap(key0, value0);
}

From source file:Main.java

private static Map<Object, Object> createMap(Object... keysAndValues) {
    switch (keysAndValues.length) {
    case 0://from w w w  . j  a  va  2s .co m
        return Collections.emptyMap();
    case 2:
        return Collections.singletonMap(keysAndValues[0], keysAndValues[1]);
    }
    if (keysAndValues.length % 2 == 1) {
        throw new IllegalArgumentException("Odd number of createMap arguments");
    }

    final Map<Object, Object> map = new HashMap<Object, Object>();
    for (int i = 0; i < keysAndValues.length; i += 2) {
        map.put(keysAndValues[i], keysAndValues[i + 1]);
    }
    return map;
}

From source file:Main.java

static <K, V> Map<K, V> getMap(Map<K, V> orig) {
    if (orig == null || orig.size() == 0) {
        return Collections.emptyMap();
    } else if (orig.size() == 1) {
        final Map.Entry<K, V> entry = orig.entrySet().iterator().next();
        return Collections.singletonMap(entry.getKey(), entry.getValue());
    } else {//from  w ww .  ja  va  2s  .c  om
        return Collections.unmodifiableMap(new TreeMap<>(orig));
    }
}

From source file:com.joshlong.activiti.coordinator.registration1.distribution.producer.RegistrationProducerMain.java

/**
 * continues generating new processes until it reaches a certain count
 *///from w ww.ja  v a  2s  .c o m
static void doContinuousIterationUpUntil(ApplicationContext ctx, int counter) throws Throwable {
    ProcessEngine processEngine = ctx.getBean(ProcessEngine.class);
    for (int customerId = 0; customerId < counter; customerId++) {
        Map<String, Object> vars = Collections.singletonMap("customerId", (Object) customerId);
        processEngine.getRuntimeService().startProcessInstanceByKey("customer-fullfillment-process", vars);
    }
    while (true)
        Thread.sleep(10000);
}

From source file:Maps.java

public static <K, V> Map<K, V> put(Map<K, V> map, K key, V value) {
    switch (map.size()) {
    case 0://from  ww  w .  j  ava 2s  .c o m
        // Empty -> Singleton
        return Collections.singletonMap(key, value);
    case 1: {
        if (map.containsKey(key)) {
            return create(key, value);
        }
        // Singleton -> HashMap
        Map<K, V> result = new HashMap<K, V>();
        result.put(map.keySet().iterator().next(), map.values().iterator().next());
        result.put(key, value);
        return result;
    }
    default:
        // HashMap
        map.put(key, value);
        return map;
    }
}