Example usage for java.util Iterator hasNext

Introduction

In this page you can find the example usage for java.util Iterator hasNext.

Prototype

boolean hasNext();

Source Link

Document

Returns true if the iteration has more elements.

Usage

From source file:Main.java

public static void writeToWriter(Iterator it, Writer out) throws IOException {
    while (it.hasNext()) {
        out.write(it.next().toString());
        out.write(newLine);//  w w w. j  av  a 2  s  .  com
    }
    out.flush();
}

From source file:Main.java

public static void freeBitmapMap(Map map) {
    Iterator iterator = map.entrySet().iterator();
    do {/*from  w  w w  . ja v  a 2 s .co  m*/
        if (!iterator.hasNext())
            break;
        Bitmap bitmap = (Bitmap) ((java.util.Map.Entry) iterator.next()).getValue();
        if (bitmap != null)
            bitmap.recycle();
    } while (true);
    map.clear();
}

From source file:Main.java

@SuppressWarnings({ "unchecked", "rawtypes" })
public static void UpperCaseItems(Collection collection) {

    //Basic iterator ... cannot modify collection using this method.
    Iterator iterator = collection.iterator();
    while (iterator.hasNext()) {
        Object object = iterator.next();
        if (object instanceof String) {
            System.out.println(((String) object).toUpperCase());
            //object = ((String) object).toUpperCase();  doesn't actually change the underlying object.
        }/*w  w w.ja  v a  2s .c om*/
    }

    //old school for loop ... can modify collection. This is not a structural change to the collection, just a change to the members. Structural collection changes in a loop is not recommended.
    if (collection instanceof ArrayList) {
        for (int i = 0; i < collection.size(); i++) {
            Object object = ((ArrayList) collection).get(i);
            String item = ((String) object);
            ((ArrayList) collection).set(i, item.toUpperCase());
        }
    }
}

From source file:Main.java

private static void frequenceyCount(String input) {
    Map<Character, Integer> hashCount = new HashMap<>();
    Character c;/* w  w  w.ja  v a 2s  .  c om*/
    for (int i = 0; i < input.length(); i++) {
        c = input.charAt(i);
        if (hashCount.get(c) != null) {
            hashCount.put(c, hashCount.get(c) + 1);
        } else {
            hashCount.put(c, 1);
        }
    }
    Iterator it = hashCount.entrySet().iterator();
    System.out.println("char : frequency");
    while (it.hasNext()) {
        Map.Entry pairs = (Map.Entry) it.next();
        System.out.println(pairs.getKey() + " : " + pairs.getValue());
        it.remove();
    }
}

From source file:Main.java

public static ArrayList<Integer> filterPoint(ArrayList<Integer> timePoints) {
    int lastPeriod = -1;
    logInConsole(timePoints);//  ww w. j  a  v a 2 s.c om
    Iterator<Integer> it = timePoints.iterator();
    while (it.hasNext()) {
        int tmp = it.next();
        if (lastPeriod != -1 && tmp - lastPeriod < MIN_PERIOD) {
            it.remove();
        } else {
            lastPeriod = tmp;
        }
    }
    logInConsole(timePoints);
    return timePoints;
}

From source file:Main.java

public static String convert2XML_(Map<String, String> params) {
    StringBuffer sb = new StringBuffer("<xml>");
    try {/*from  ww w. j ava 2s  .com*/
        Iterator it = params.entrySet().iterator();
        while (it.hasNext()) {
            Entry entry = (Entry) it.next();
            sb.append("<![CDATA[" + entry.getValue() + "]]");
            sb.append(entry.getValue());
            sb.append("</" + entry.getKey() + ">");
        }
        sb.append("<CreateTime>").append(new Date().getTime()).append("</CreateTime>");
        sb.append("</xml>");

    } catch (Exception e) {
        e.printStackTrace();
    }
    return sb.toString();
}

From source file:Main.java

public static float[] asFloatArray(Collection<Float> collection) {
    float[] array = new float[collection.size()];
    Iterator<Float> iterator = collection.iterator();
    int i = 0;//  w  w  w  . j a  va 2 s.  c  om
    while (iterator.hasNext()) {
        array[i++] = iterator.next();
    }
    return array;
}

From source file:Main.java

public static boolean isNullOrEmpty(final Iterator<?> iterator) {
    return (iterator == null) || (!iterator.hasNext());
}

From source file:Main.java

public static <T extends Object> List<T> map2list(Map<String, T> maps) {
    List<T> list = new ArrayList<T>();
    Iterator<Entry<String, T>> iterator = maps.entrySet().iterator();
    while (iterator.hasNext()) {
        Entry<String, T> entry = iterator.next();
        list.add(entry.getValue());/*  w  w w  .  jav a 2 s  .c o m*/
    }
    return list;
}