?? genericcast32.java
字號:
// generics/GenericCast32.java
// TIJ4 Chapter Genericss, Exercise 32, page 699
/*
* Verify that FixedSizeStack in GenericCast.java generates exceptions
* if you try to go out of its bounds. Does this mean that bounds-checking
* code is not required?
*/
class FixedSizeStack<T> {
private int index = 0;
private Object[] storage;
public FixedSizeStack(int size) {
storage = new Object[size];
}
int getIndex() { return index; }
public void push(T item) { storage[index++] = item; }
@SuppressWarnings("unchecked")
public T pop() { return (T)storage[--index]; }
}
public class GenericCast32 {
public static final int SIZE = 10;
public static void main(String[] args) {
FixedSizeStack<String> strings =
new FixedSizeStack<String>(SIZE);
for(String s : "A B C D E F G H I J".split(" "))
strings.push(s);
// Runtime ArrayIndexOutOfBoundsException:
// strings.push("oops"); // Bounds-checking required:
if(strings.getIndex() < SIZE) strings.push("oops");
for(int i = 0; i < SIZE; i++) {
String s = strings.pop();
System.out.print(s + " ");
}
}
}
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