private static boolean verbose;

private static volatile String answer = null;

private static long calcMulti(ArrayList<String> al) {

long then = System.currentTimeMillis();

Stream<String> stream = al.stream();

Optional<String> t = stream.filter(symbol -> symbol.charAt(0) != 'A').

filter(symbol -> symbol.charAt(1) != 'A').

filter(symbol -> symbol.charAt(2) != 'A').

filter(symbol -> symbol.charAt(3) != 'A').findFirst();

answer = t.get();

long now = System.currentTimeMillis();

return now - then;

}

private static ArrayList<String> calcArray(ArrayList<String> src,

int c, char target) {

ArrayList<String> dst = new ArrayList<>();

for (String s : src) {

if (s.charAt(c) != target)

dst.add(s);

}

return dst;

}

private static long calcEager(ArrayList<String> al) {

long then = System.currentTimeMillis();

ArrayList<String> al1 = calcArray(al, 0, 'A');

ArrayList<String> al2 = calcArray(al1, 1, 'A');

ArrayList<String> al3 = calcArray(al2, 2, 'A');

ArrayList<String> al4 = calcArray(al3, 3, 'A');

answer = al4.get(0);

long now = System.currentTimeMillis();

return now - then;

}

public static void main(String[] args) {

verbose = Boolean.getBoolean("verbose");

ArrayList<String> al = new ArrayList<>(500000);

for (int first = (int) 'A'; first <= (int) 'Z'; first++) {

for (int second = 'A'; second <= 'Z'; second++) {

for (int third = 'A'; third <= 'Z'; third++) {

for (int fourth = 'A'; fourth <= 'Z'; fourth++) {

char[] c = new char[4];

c[0] = (char) first;

c[1] = (char) second;

c[2] = (char) third;

c[3] = (char) fourth;

al.add(new String(c));

}

}

}

}

System.out.println("Start");

long time = 0;

for (int i = 0; i < 1000; i++) {

switch (args[0]) {

case "Multi":

time += calcMulti(al);

break;

case "Eager":

time += calcEager(al);

break;

}

}

System.out.println("Operation took " + time + " ms for " + answer);

}