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prefer using private everywhere

master
David 2 years ago
parent
commit
d9646b2223
1 changed files with 18 additions and 11 deletions
  1. +18
    -11
      src/ChainQueue.java

+ 18
- 11
src/ChainQueue.java View File

@@ -35,15 +35,23 @@ public class ChainQueue<E> implements Queue<E> {
}
}

Node<E> first; // first item of the queue
private Node<E> first; // first item of the queue

public Node<E> getFirst() {
return first;
}

public void setFirst(Node<E> first) {
this.first = first;
}

@Override
public boolean add(E input) { // Übergeben der "Data"
if (first == null) { // is the first empty?
first = new Node(input); // yes? -> insert the node here
if (getFirst() == null) { // is the first empty?
setFirst(new Node(input)); // yes? -> insert the node here
return true;
}
return addNode(input, first); // no? -> goto addNode()
return addNode(input, getFirst()); // no? -> goto addNode()
}

private boolean addNode(E input, Node n) { // run through the queue and find the first "place" which is empty
@@ -56,7 +64,7 @@ public class ChainQueue<E> implements Queue<E> {

@Override
public int size() { // run through the queue and count the size
Node temp = first;
Node temp = getFirst();
int size = 0;
while (temp != null) {
size++;
@@ -76,9 +84,9 @@ public class ChainQueue<E> implements Queue<E> {

@Override
public boolean contains(Object o) { // does object o exist in our queue?
Node temp = first;
Node temp = getFirst();
for (int i = 0; i < this.size(); i++) {
if (first.getData().equals(o)) {
if (getFirst().getData().equals(o)) {
return true;
}
temp = temp.getNext();
@@ -145,8 +153,8 @@ public class ChainQueue<E> implements Queue<E> {
public E poll() { // poll next from queue and remove the first
E temp = null;
if (!this.isEmpty()) {
temp = first.getData();
first = first.getNext();
temp = getFirst().getData();
setFirst(getFirst().getNext());
}
return temp;
}
@@ -159,9 +167,8 @@ public class ChainQueue<E> implements Queue<E> {
@Override
public E peek() { // only "see" into the queue and do not remove anything
if (!this.isEmpty()) {
return first.getData();
return getFirst().getData();
}
return null;
}

}

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