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2010-06-01T05:05:30Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Add or insert an element to ArrayList using Java ListIterator ==



<source lang="java">
import java.util.ArrayList;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
ArrayList<String> aList = new ArrayList<String>();
aList.add("1");
aList.add("2");
aList.add("3");
aList.add("4");
aList.add("5");
ListIterator<String> listIterator = aList.listIterator();
listIterator.next();
listIterator.add("Added Element");
for (String str: aList){
System.out.println(str);
}
}
}</source>



== Get Previous and next index using Java ListIterator ==



<source lang="java">
import java.util.ArrayList;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
ArrayList<String> aList = new ArrayList<String>();
aList.add("1");
aList.add("2");
aList.add("3");
aList.add("4");
aList.add("5");
ListIterator<String> listIterator = aList.listIterator();
System.out.println("Previous: " + listIterator.previousIndex());
System.out.println("Next: " + listIterator.nextIndex());
// advance current position by one using next method
listIterator.next();
System.out.println("Previous: " + listIterator.previousIndex());
System.out.println("Next: " + listIterator.nextIndex());
}
}</source>



== Iterate through elements ArrayList using ListIterator ==



<source lang="java">
import java.util.ArrayList;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("1");
arrayList.add("2");
arrayList.add("3");
arrayList.add("4");
arrayList.add("5");
ListIterator itr = arrayList.listIterator();
System.out.println("in forward direction");
while (itr.hasNext()) {
System.out.println(itr.next());
}
System.out.println("in backward direction");
while (itr.hasPrevious()) {
System.out.println(itr.previous());
}
}
}
/*in forward direction
1
2
3
4
5
in backward direction
5
4
3
2
1
*/</source>



== Iterate through elements of Java LinkedList using ListIterator ==



<source lang="java">
import java.util.ListIterator;
import java.util.LinkedList;
public class Main {
public static void main(String[] args) {
LinkedList<String> lList = new LinkedList<String>();
lList.add("1");
lList.add("2");
lList.add("3");
lList.add("4");
lList.add("5");
ListIterator itr = lList.listIterator();
System.out.println("forward direction");
while (itr.hasNext()){
System.out.println(itr.next());
}
System.out.println("reverse direction");
while (itr.hasPrevious()){
System.out.println(itr.previous());
}
}
}</source>



== ListIterator: In reverse order ==



<source lang="java">
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class MainClass {
public static void main(String[] a) {
List list = new LinkedList();
list.add("A");
list.add("B");
list.add("C");
list.add("D");
ListIterator iter = list.listIterator(list.size());
while (iter.hasPrevious()) {
System.out.println(iter.previous());
}
}
}</source>



== ListIterator: Like an Iterator ==



<source lang="java">
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class MainClass {
public static void main(String[] a) {
List list = new LinkedList();
list.add("A");
list.add("B");
list.add("C");
list.add("D");
ListIterator iter = list.listIterator();
while (iter.hasNext()) {
System.out.println(iter.next());
}
}
}</source>



<pre class=codeResult>A
B
C
D</pre>

== Modifying the list that the iterator came from: add(), remove(), and set() ==



<source lang="java">
public void add(Object element)
public void remove()
public void set(Object element)</source>



<pre class=codeResult>D
[A, B, C, a, D]</pre>

== Remove an element from ArrayList using Java ListIterator ==



<source lang="java">
import java.util.ArrayList;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
ArrayList<String> aList = new ArrayList<String>();
aList.add("1");
aList.add("2");
aList.add("3");
aList.add("4");
aList.add("5");
// Get an object of ListIterator using listIterator() method
ListIterator listIterator = aList.listIterator();
listIterator.next();
listIterator.next();
// remove element returned by last next method
listIterator.remove();
for (String str: aList){
System.out.println(str);
}
}
}</source>



== Replace an element from ArrayList using Java ListIterator ==



<source lang="java">
import java.util.ArrayList;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
ArrayList<String> aList = new ArrayList<String>();
aList.add("1");
aList.add("2");
aList.add("3");
aList.add("4");
aList.add("5");
ListIterator<String> listIterator = aList.listIterator();
listIterator.next();
listIterator.set("100");
for (String str : aList) {
System.out.println(str);
}
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010