Content-Length: 1928 | pFad | https://github.com/jake1412/Java-Programming/raw/refs/heads/main/FAT-Practice/src/MapsPractice.java
th: 1916
import java.util.*;
public class MapsPractice {
public static void main(String[] args) {
HashMap> h1 = new LinkedHashMap<>();
HashMap h2 = new LinkedHashMap<>();
// Check if HashMap is empty
System.out.println("is studentsMapping empty?: " + h1.isEmpty());
System.out.println("is studentsMapping empty?: " + h2.isEmpty());
// creating list of subjects and adding to hash map
List subjects = Arrays.asList("Python", "Math", "C");
h1.put("A", subjects);
subjects = Arrays.asList("C", "C++");
h1.put("B", subjects);
subjects = Arrays.asList("C++", "Physics", "Chemistry");
h1.put("C", subjects);
// creating hashmap of faculty
h2.put("Python", "111");
h2.put("Math", "222");
h2.put("C", "333");
h2.put("C++", "444");
// displaying all students and subjects
for (Map.Entry m : h1.entrySet()) {
System.out.println(m.getKey());
subjects = (List) m.getValue();
for (String s : subjects)
System.out.print(s + " ");
System.out.println();
}
// displaying all subjects and faculty
for (Map.Entry m : h2.entrySet()) {
System.out.println(m.getKey() + " " + m.getValue());
}
// Scanner sc = new Scanner(System.in);
// System.out.print("Enter a student: ");
String s = "B";
System.out.println("Faculties are: ");
for (Map.Entry m : h1.entrySet()) {
if (m.getKey().equals(s)) {
for (Map.Entry m2 : h2.entrySet()) {
subjects = (List) m.getValue();
if (subjects.contains(m2.getKey()))
System.out.println(m2.getValue());
}
}
}
}
}
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