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RemoveEvens.java
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55 lines (44 loc) · 1.15 KB
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package dp;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
class RemoveEvens {
public static void removeEvensVer1(List<Integer> lst) {
int i = 0;
while (i < lst.size())
if (lst.get(i) % 2 == 0)
lst.remove(i);
else
i++;
}
public static void removeEvensVer2(List<Integer> lst) {
for (Integer x : lst)
if (x % 2 == 0)
lst.remove(x);
}
public static void removeEvensVer3(List<Integer> lst) {
Iterator<Integer> itr = lst.iterator();
while (itr.hasNext())
if (itr.next() % 2 == 0)
itr.remove();
}
public static void main(String[] args) {
int N = 1600000;
List<Integer> lst1 = new ArrayList<>();
List<Integer> lst2 = new LinkedList<>();
for (int i = 0; i < N; i++) {
lst1.add(i);
lst2.add(i);
}
long start, end;
start = System.currentTimeMillis();
removeEvensVer3(lst2);
end = System.currentTimeMillis();
System.out.println((end - start) + " ms for LinkedList size " + N);
start = System.currentTimeMillis();
removeEvensVer3(lst1);
end = System.currentTimeMillis();
System.out.println((end - start) + " ms for ArrayList size " + N);
}
}