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List.java
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86 lines (79 loc) · 2.33 KB
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public class List {
private Node top;
private int size;
public void append(int value) {
insert(size, value);
}
public void insert(int index, int value) {
if (index < 0 || index > size) {
throw new IndexOutOfBoundsException("" + index);
} else {
Node newNode = new Node(value);
if (index == 0) {
newNode.next = top;
top = newNode;
} else {
Node prevNode = top;
for (int i = 0; i < index - 1; i++) {
prevNode = prevNode.next;
}
newNode.next = prevNode.next;
prevNode.next = newNode;
}
size++;
System.out.println("Inserted " + value + " at index " + index);
}
}
public int remove(int index) {
if (index < 0 || index >= size) {
throw new IndexOutOfBoundsException("" + index);
} else {
int value;
if (index == 0) {
value = top.value;
top = top.next;
} else {
Node prevNode = top;
for (int i = 0; i < index - 1; i++) {
prevNode = prevNode.next;
}
value = prevNode.next.value;
prevNode.next = prevNode.next.next;
}
size--;
System.out.println("Removed " + value + " from index " + index);
return value;
}
}
public int get(int index) {
if (index < 0 || index >= size) {
throw new IndexOutOfBoundsException("" + index);
} else {
Node node = top;
for (int i = 0; i < index; i++) {
node = node.next;
}
return node.value;
}
}
public int size() {
return size;
}
public String toString() {
return ((top == null) ? "[EMPTY]" : top.toString());
}
public static void main(String[] args) {
// example usage
List list = new List();
list.append(1);
list.append(2);
list.append(4);
list.insert(2, 3);
System.out.println(list);
list.remove(0);
System.out.println(list);
list.remove(0);
list.remove(1);
list.remove(0);
}
}