33 lines
901 B
Java
33 lines
901 B
Java
// generics/GenericCast.java
|
|
// ©2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
|
|
|
|
class FixedSizeStack<T> {
|
|
private int index = 0;
|
|
private Object[] storage;
|
|
public FixedSizeStack(int size) {
|
|
storage = new Object[size];
|
|
}
|
|
public void push(T item) { storage[index++] = item; }
|
|
@SuppressWarnings("unchecked")
|
|
public T pop() { return (T)storage[--index]; }
|
|
}
|
|
|
|
public class GenericCast {
|
|
public static final int SIZE = 10;
|
|
public static void main(String[] args) {
|
|
FixedSizeStack<String> strings =
|
|
new FixedSizeStack<>(SIZE);
|
|
for(String s : "A B C D E F G H I J".split(" "))
|
|
strings.push(s);
|
|
for(int i = 0; i < SIZE; i++) {
|
|
String s = strings.pop();
|
|
System.out.print(s + " ");
|
|
}
|
|
}
|
|
}
|
|
/* Output:
|
|
J I H G F E D C B A
|
|
*/
|