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List.java
159 lines (133 loc) · 4.03 KB
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List.java
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import java.util.ArrayList;
import java.util.LinkedList;
import java.util.ListIterator;
public class List {
private static void expect(boolean v) {
if (! v) throw new RuntimeException();
}
private static String printList(ArrayList<Integer> list) {
StringBuilder sb = new StringBuilder();
for (Integer i : list) {
sb.append(i);
sb.append(", ");
}
sb.setLength(sb.length()-2);
return sb.toString();
}
private static void isEqual(String s1, String s2) {
System.out.println(s1);
expect(s1.equals(s2));
}
private static void testIterators(java.util.List<Integer> l) {
l.add(1);
l.add(2);
l.add(3);
ListIterator<Integer> it = l.listIterator();
expect(it.next().equals(Integer.valueOf(1)));
expect(it.next().equals(Integer.valueOf(2)));
expect(it.next().equals(Integer.valueOf(3)));
expect(! it.hasNext());
it = l.listIterator(1);
expect(it.next().equals(Integer.valueOf(2)));
expect(it.next().equals(Integer.valueOf(3)));
expect(! it.hasNext());
it = l.listIterator(2);
expect(it.next().equals(Integer.valueOf(3)));
expect(! it.hasNext());
it = l.listIterator(3);
expect(it.previous().equals(Integer.valueOf(3)));
expect(it.previous().equals(Integer.valueOf(2)));
expect(it.previous().equals(Integer.valueOf(1)));
expect(! it.hasPrevious());
it = l.listIterator(2);
expect(it.previous().equals(Integer.valueOf(2)));
expect(it.previous().equals(Integer.valueOf(1)));
expect(! it.hasPrevious());
it = l.listIterator(1);
expect(it.previous().equals(Integer.valueOf(1)));
expect(! it.hasPrevious());
}
private static void testIterators2(java.util.List<Integer> l) {
l.add(1);
l.add(2);
l.add(3);
ListIterator<Integer> it = l.listIterator();
expect(it.next().equals(Integer.valueOf(1)));
it.remove();
expect(it.next().equals(Integer.valueOf(2)));
it.remove();
expect(it.next().equals(Integer.valueOf(3)));
it.remove();
expect(! it.hasNext());
expect(l.isEmpty());
l.add(1);
l.add(2);
l.add(3);
it = l.listIterator(1);
expect(it.next().equals(Integer.valueOf(2)));
it.remove();
expect(it.next().equals(Integer.valueOf(3)));
it.remove();
expect(! it.hasNext());
expect(l.size() == 1);
l.add(2);
l.add(3);
it = l.listIterator(2);
expect(it.next().equals(Integer.valueOf(3)));
it.remove();
expect(! it.hasNext());
expect(l.size() == 2);
l.add(3);
it = l.listIterator(3);
expect(it.previous().equals(Integer.valueOf(3)));
it.remove();
expect(it.previous().equals(Integer.valueOf(2)));
it.remove();
expect(it.previous().equals(Integer.valueOf(1)));
it.remove();
expect(! it.hasPrevious());
expect(l.isEmpty());
l.add(1);
l.add(2);
l.add(3);
it = l.listIterator(2);
expect(it.previous().equals(Integer.valueOf(2)));
it.remove();
expect(it.previous().equals(Integer.valueOf(1)));
it.remove();
expect(! it.hasPrevious());
expect(l.size() == 1);
l.clear();
l.add(1);
l.add(2);
l.add(3);
it = l.listIterator(1);
expect(it.previous().equals(Integer.valueOf(1)));
it.remove();
expect(! it.hasPrevious());
expect(l.size() == 2);
}
public static void main(String args[]) {
ArrayList<Integer> l = new ArrayList<Integer>();
l.add(1); l.add(2); l.add(3); l.add(4); l.add(5);
isEqual(printList(l), "1, 2, 3, 4, 5");
l.add(0, 6);
isEqual(printList(l), "6, 1, 2, 3, 4, 5");
l.add(2, 7);
isEqual(printList(l), "6, 1, 7, 2, 3, 4, 5");
l.remove(1);
isEqual(printList(l), "6, 7, 2, 3, 4, 5");
l.add(6, 8);
isEqual(printList(l), "6, 7, 2, 3, 4, 5, 8");
Integer[] ints = new Integer[15];
Integer[] z = l.toArray(ints);
expect(z == ints);
for (int i=0; i < z.length; i++) {
System.out.println(z[i]);
}
testIterators(new ArrayList());
testIterators(new LinkedList());
testIterators2(new ArrayList());
testIterators2(new LinkedList());
}
}