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Chapter_15_ps.java
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Chapter_15_ps.java
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//* Practice Some Advance Java Questions */
import java.util.ArrayList; // For Q-1
import java.util.Date; // For Q-2
import java.util.Calendar; // For Q-3
import java.time.*; // For Q-4
import java.util.HashSet; // For Q-5
public class Chapter_15_ps {
@SuppressWarnings("deprecation")
public static void main(String[] args) {
// ? Q-1 Create an ArrayList and store the names of ten students inside it.
// ? Print it using a for each loop.
ArrayList<String> a = new ArrayList<>();
a.add("Devendra-Parmar");
a.add("Jay-Bhatt");
a.add("Paresh-Mori");
a.add("Divin-Makwana");
a.add("Prince-Bhindi");
a.add("Priyanshu-Limbasiya");
a.add("Rohit-Majethiya");
a.add("Subham-Rathod");
a.add("Devang-Parekh");
a.add("Mohit-Dodiya");
for (String friendName : a) {
System.out.println(friendName);
}
// ! Q-1 Complete Here
// ? Q-2 Use the Date class in Java to print the time in the following format :
// ? 21:47:02.
Date d = new Date();
System.out.println(d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds());
// ! Q-2 Complete Here
// ? Q-3 Repeat question number 2 using the Calendar class.
Calendar c = Calendar.getInstance();
System.out.println(c.get(c.HOUR_OF_DAY) + ":" + c.get(c.MINUTE) + ":" + c.get(c.SECOND));
// ! Q-3 Complete Here
// ? Q-4 Repeat question number 2 using java.time API.
LocalDateTime ldt = LocalDateTime.now();
java.time.format.DateTimeFormatter dtf = java.time.format.DateTimeFormatter
.ofPattern("H:m:s");
System.out.println(ldt.format(dtf));
// ! Q-4 Complete Here
// ? Q-5 Create a Set in java. Try to store the duplicate values elements inside
// ? this set and verify that only one instance is stored.
HashSet<Integer> h = new HashSet<>();
h.add(10);
h.add(20);
h.add(30);
h.add(40);
h.add(50);
h.add(10);
System.out.println(h);
// ! Q-5 Complete Here
}
}