|
| |
| 12. 6. 2. 使用原始包装类型作为参数 |
|
|
|
class ListItem {
public ListItem(Object item) {
this.item = item;
next = null;
}
public String toString() {
return "ListItem " + item;
}
ListItem next;
Object item;
}
class LinkedList<T> {
public LinkedList() {
}
public LinkedList(T item) {
if (item != null) {
current = end = start = new ListItem(item);
}
}
public LinkedList(T[] items) {
if (items != null) {
for (int i = 0; i < items.length; i++) {
addItem(items[i]);
}
current = start;
}
}
public void addItem(T item) {
ListItem newEnd = new ListItem(item);
if (start == null) {
start = end = newEnd;
} else {
end.next = newEnd;
end = newEnd;
}
}
public T getFirst() {
current = start;
return start == null ? null : start.item;
}
public T getNext() {
if (current != null) {
current = current.next;
}
return current == null ? null : current.item;
}
private ListItem start = null;
private ListItem end = null;
private ListItem current = null;
private class ListItem {
public ListItem(T item) {
this.item = item;
next = null;
}
public String toString() {
return "ListItem " + item;
}
ListItem next;
T item;
}
}
public class MainClass {
public static void main(String[] args) {
LinkedList<Double> temperatures = new LinkedList<Double>();
// Insert 6 temperature values 0 to 25 degress Centigrade
for (int i = 0; i < 6; i++) {
temperatures.addItem(25.0 * Math.random());
}
System.out.printf("%.2f degrees Fahrenheit%n", toFahrenheit(temperatures.getFirst()));
Double value = null;
while ((value = temperatures.getNext()) != null) {
System.out.printf("%.2f degrees Fahrenheit%n", toFahrenheit(value));
}
}
// Convert Centigrade to Fahrenheit
public static double toFahrenheit(double temperature) {
return 1.8 * temperature + 32.0;
}
}
|
|
69.27 degrees Fahrenheit
51.55 degrees Fahrenheit
59.97 degrees Fahrenheit
35.82 degrees Fahrenheit
41.28 degrees Fahrenheit
37.99 degrees Fahrenheit |
|