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 clearTempDirectory() {
    // Abandon if we created no files in this session
    if (tempFileList.size() == 0)
        return;//w w  w. j  a  v a 2  s.  c  o m
    Iterator i = tempFileList.iterator();
    while (i.hasNext()) {
        try {
            File f = new File((String) i.next());
            f.delete();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

From source file:Main.java

public static <T> T first(Collection<T> list) {
    Iterator<T> iterator = list.iterator();
    if (iterator.hasNext()) {
        return iterator.next();
    }/*  w  ww .  j  av  a 2  s  . com*/
    return null;
}

From source file:Main.java

public static <T> String join(Iterable<T> iterable, String d) {
    Iterator it = iterable.iterator();
    if (!it.hasNext()) {
        return "";
    }/*from   w ww.ja  v  a2  s  .  c o m*/
    StringBuilder sb = new StringBuilder();
    String prefix = "";
    while (it.hasNext()) {
        sb.append(prefix);
        prefix = d;
        sb.append(it.next());
    }
    return sb.toString();
}

From source file:Main.java

public static String toPathString(Iterable<File> files, String separator) {
    final StringBuilder builder = new StringBuilder();
    final Iterator<File> fileIt = files.iterator();
    while (fileIt.hasNext()) {
        builder.append(fileIt.next().getAbsolutePath());
        if (fileIt.hasNext()) {
            builder.append(separator);//from   ww  w .  j  ava2  s  .c o  m
        }
    }
    return builder.toString();
}

From source file:Main.java

public static String getReqPama(Map<String, String> params) {
    StringBuffer sBuffer = new StringBuffer();
    Iterator<?> iterator = params.keySet().iterator();
    while (iterator.hasNext()) {
        String key = (String) iterator.next();
        sBuffer.append(key + "=" + params.get(key) + "&");
    }/* www. j a v a 2  s  . co m*/
    String reqString = sBuffer.toString();
    return reqString.substring(0, reqString.length() - 1);
}

From source file:Main.java

/**
 * an alternative which returns slightly more granular info than boolean pass/fail.
 * @return the number of add operations which "succeed" (modify the collection)
 * @see Collection#addAll(Collection)//from w  w w .  ja va2s .c om
 */
public static <E> int addAll(Collection<E> collection, Iterator<? extends E> add) {
    int retVal = 0;
    while (add.hasNext())
        if (collection.add(add.next()))
            ++retVal;
    return retVal;
}

From source file:Main.java

public static boolean iteratesEqualSequence(Iterator<?> iter1, Iterator<?> iter2) {
    while (iter1.hasNext()) {

        if (!iter2.hasNext())
            return false;
        Object o1 = iter1.next();
        Object o2 = iter2.next();
        if (!o1.equals(o2))
            return false;

    }//  ww w  . j  a  v a 2s . c o  m

    if (iter2.hasNext())
        return false;

    return true;
}

From source file:Main.java

public static String join(Collection<?> input, String sep) {
    if (input == null || input.size() == 0) {
        return "";
    }/*ww  w.  ja v  a2s .co m*/
    StringBuilder sb = new StringBuilder();
    int index = 0;
    int size = input.size();
    Iterator<?> it = input.iterator();
    while (it.hasNext()) {
        if (index == size - 1) {
            break;
        }
        Object o = it.next();
        sb.append(o).append(sep);
        index++;
    }
    sb.append(it.next());
    return sb.toString();
}

From source file:Main.java

/**
 * Returns the number of occurrences of <i>obj</i> in <i>col</i>.
 *///ww  w.j  a  v a  2  s  .c o m
public static int cardinality(Object obj, final Collection col) {
    int count = 0;
    Iterator it = col.iterator();
    while (it.hasNext()) {
        Object elt = it.next();
        if ((null == obj && null == elt) || obj.equals(elt)) {
            count++;
        }
    }
    return count;
}

From source file:Main.java

public static String toString(Iterable<?> it, String separator) {
    final StringBuilder builder = new StringBuilder();
    final Iterator<?> iterator = it.iterator();
    while (iterator.hasNext()) {
        builder.append(iterator.next().toString());
        if (iterator.hasNext()) {
            builder.append(separator);/* w w w  .j  a  v  a  2  s .c om*/
        }
    }
    return builder.toString();
}