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Copy pathMyIterator.java
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112 lines (88 loc) · 2.09 KB
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package Home11;
import com.sun.tools.javac.util.List;
import java.util.Iterator;
import java.util.ListIterator;
public class MyIterator implements ListIterator {
private Node nodes;
public MyIterator(Node nodes) {
this.nodes = nodes;
}
@Override
public boolean hasNext() {
return nodes != null;
}
@Override
public Object next() {
Object current;
if(hasNext()){
current = nodes.getData();
nodes = nodes.getNext();
return current;
}else {
System.out.println("ERROR ");
return null;
}
}
@Override
public boolean hasPrevious() {
if(nodes.getPrev() != null){
return true;
}
return false;
}
@Override
public Object previous() {
if(nodes.getPrev() != null){
return nodes.getPrev().getData();
}
return null;
}
@Override
public int nextIndex() {
int count = 0;
for(Node node = nodes; node != null; node = node.getPrev()){
if(node.getPrev() == null){
count++;
return count;
}
count++;
}
return size();
}
@Override
public int previousIndex() {
int count = 0;
for(Node node = nodes; node != null; node = node.getPrev()){
if(node.getPrev() == null){
count--;
return count;
}
count++;
}
return size();
}
@Override
public void remove() {
System.out.println("there's nothing here");
}
@Override
public void set(Object o) {
nodes.setData(o);
}
@Override
public void add(Object o) {
}
public int size(){
int size = 0;
Node buff = null;
for(Node x = nodes; x != null; x = x.getPrev()){
if(x.getPrev() == null) {
buff = x;
}
}
for(Node x = buff;x != null;x = x.getNext()){
size++;
}
return size;
}
}