в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

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2010-05-31T14:10:43Z

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== implements Iterator < Character > ==



<source lang="java">
import java.util.Iterator;
import java.util.NoSuchElementException;

class IterableString implements Iterable<Character>,
Iterator<Character> {
private String str;
private int count = 0;

IterableString(String s) {
str = s;
}

public boolean hasNext() {
if(count < str.length()) return true;
return false;
}

public Character next() {
if(count == str.length())
throw new NoSuchElementException();

count++;
return str.charAt(count-1);
}

public void remove() {
throw new UnsupportedOperationException();
}

public Iterator<Character> iterator() {
return this;
}
}

public class MainClass {
public static void main(String args[]) {
IterableString x = new IterableString("This is a test.");

for(char ch : x)
System.out.print(ch);

System.out.println();
}
}

</source>



== Iterator: hasNext() ==



<source lang="java">
/**
*Output:
Original contents of al: C A E B D F
Modified list backwards: F+ D+ B+ E+ A+ C+
*/
import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
public class MainClass {
public static void main(String args[]) {
ArrayList<String> al = new ArrayList<String>();
al.add("C");
al.add("A");
al.add("E");
al.add("B");
al.add("D");
al.add("F");
System.out.print("Original contents of al: ");
Iterator<String> itr = al.iterator();
while (itr.hasNext()) {
String element = itr.next();
System.out.print(element + " ");
}
System.out.println();
ListIterator<String> litr = al.listIterator();
while (litr.hasNext()) {
String element = litr.next();
litr.set(element + "+");
}
// Now, display the list backwards.
System.out.print("Modified list backwards: ");
while (litr.hasPrevious()) {
String element = litr.previous();
System.out.print(element + " ");
}
}
}

</source>



== Iterator: next() ==



<source lang="java">
/**
*Output:
Original contents of al: C A E B D F
Modified list backwards: F+ D+ B+ E+ A+ C+
*/
import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
public class MainClass {
public static void main(String args[]) {
ArrayList<String> al = new ArrayList<String>();
al.add("C");
al.add("A");
al.add("E");
al.add("B");
al.add("D");
al.add("F");
System.out.print("Original contents of al: ");
Iterator<String> itr = al.iterator();
while (itr.hasNext()) {
String element = itr.next();
System.out.print(element + " ");
}
System.out.println();
ListIterator<String> litr = al.listIterator();
while (litr.hasNext()) {
String element = litr.next();
litr.set(element + "+");
}
// Now, display the list backwards.
System.out.print("Modified list backwards: ");
while (litr.hasPrevious()) {
String element = litr.previous();
System.out.print(element + " ");
}
}
}

</source>

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