* q2: Write a public static method named q2 that takes an ArrayList of type Char
ID: 3706805 • Letter: #
Question
* q2: Write a public static method named q2 that takes an ArrayList of type Character and * returns a char. This method returns the char that comes first * alphabetically/lexicographically (case sensitive ordering) from the values of the input *(hint: In java, chars are represented as ints that preserve this ordering. You can use) q3: Write a public static method named q3 that takes an ArrayList of type String and *returns an int. This method returns the number of times* a most significant value appears * in the data where significant is defined as the String that comes first * alphabetically/lexicographically (case sensitive ordering) from the values of the input *(hint: Use the compareTo method in the String class) q4: Write a public static method named q4 that takes a HashMap of type String to Character * and returns a String. This method returns the *key mapping to*the char that comes last * alphabetically/lexicographically (case sensitive ordering) from the values of the input * (hint: In Java, chars are represented as ints that preserve this ordering. You can use * and >) *q5: Write a public static method named q5 that takes an ArrayList of Doubles as a * parameter and returns an int. This method returns the index of the first value in the * input that is in the range (-5.55,-2.13) and returns -1 if the input contains no values *in this rangeExplanation / Answer
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public static char q2(ArrayList<Character> chars) {
char ch = Character.MAX_VALUE;
int chVal = (int) ch;
for (int i = 0; i < chars.size(); i++) {
if ((int) chars.get(i) < chVal) {
ch = chars.get(i);
chVal = (int) ch;
}
}
return ch;
}
public static int q3(ArrayList<String> strings) {
String mostSignificant = strings.get(0);
int count = 0;
for (int i = 0; i < strings.size(); i++) {
if (strings.get(i).compareTo(mostSignificant) < 0) {
mostSignificant = strings.get(i);
count = 1;
} else if (strings.get(i).compareTo(mostSignificant) == 0) {
count++;
}
}
return count;
}
public static String q4(HashMap<String, Character> mp) {
Iterator<Entry<String, Character>> it = mp.entrySet().iterator();
if (it.hasNext()) {
Map.Entry<String, Character> pair = (Map.Entry<String, Character>) it.next();
String lowes = pair.getKey();
Character highChar = pair.getValue();
while (it.hasNext()) {
pair = (Map.Entry<String, Character>) it.next();
if (pair.getValue() > highChar) {
highChar = pair.getValue();
lowes = pair.getKey();
}
}
return lowes;
} else {
return null;
}
}
public static int q5(ArrayList<Double> doubles) {
for (int i = 0; i < doubles.size(); i++) {
if ((doubles.get(i) > -5.55) && (doubles.get(i) < -2.13)) {
return i;
}
}
return -1;
}
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