?? sequence12.java
字號:
// exceptions/Sequence12.java
// TIJ4 Chapter Exceptions, Excercise 12, page 471
/* Modify innerclasses/Sequence.java so that it throws an appropriate
* exception if you try to put in too many elements.
*/
interface Selector {
boolean end();
Object current();
void next();
}
public class Sequence12 {
private Object[] items;
private int next = 0;
public Sequence12(int size) { items = new Object[size]; }
public void add(Object x) throws ArrayIndexOutOfBoundsException {
// check for full array first:
if(next == items.length)
throw new ArrayIndexOutOfBoundsException();
// if not full, fill:
if(next < items.length)
items[next++] = x;
}
private class SequenceSelector implements Selector {
private int i = 0;
public boolean end() { return i == items.length; }
public Object current() { return items[i]; }
public void next() { if(i < items.length) i++; }
}
public Selector selector() {
return new SequenceSelector();
}
public static void main(String[] args) {
Sequence12 sequence = new Sequence12(10);
for(int i = 0; i < 10; i++)
sequence.add(Integer.toString(i));
Selector selector = sequence.selector();
while(!selector.end()) {
System.out.print(selector.current() + " ");
selector.next();
}
System.out.println();
// attempt to add object to full array produces
// ArrayIndexOutOfBoundsException:
sequence.add(Integer.toString(10));
}
}
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