```java
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
class Teacher {
private String name;
private List<Student> students;
public Teacher(String name) {
this.name = name;
this.students = new ArrayList<>();
}
public String getName() {
return name;
}
public void addStudent(Student student) {
students.add(student);
}
public List<Student> getStudents() {
return students;
}
}
class Student {
private String name;
public Student(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
public class TeacherStudentManagement {
private List<Teacher> teachers;
private List<Student> students;
public TeacherStudentManagement() {
this.teachers = new ArrayList<>();
this.students = new ArrayList<>();
}
public void addTeacher(String name) {
Teacher teacher = new Teacher(name);
teachers.add(teacher);
System.out.println("Teacher added: " + name);
}
public void addStudent(String name) {
Student student = new Student(name);
students.add(student);
System.out.println("Student added: " + name);
}
public void assignStudentToTeacher(String studentName, String teacherName) {
Student student = findStudent(studentName);
Teacher teacher = findTeacher(teacherName);
if (student != null && teacher != null) {
teacher.addStudent(student);
System.out.println(studentName + " assigned to " + teacherName);
} else {
System.out.println("Student or teacher not found.");
}
}
public void displayTeacherStudents(String teacherName) {
Teacher teacher = findTeacher(teacherName);
if (teacher != null) {
List<Student> students = teacher.getStudents();
System.out.println("Students assigned to " + teacherName + ":");
for (Student student : students) {
System.out.println(student.getName());
}
} else {
System.out.println("Teacher not found.");
}
}
private Student findStudent(String name) {
for (Student student : students) {
if (student.getName().equals(name)) {
return student;
}
}
return null;
}
private Teacher findTeacher(String name) {
for (Teacher teacher : teachers) {
if (teacher.getName().equals(name)) {
return teacher;
}
}
return null;
}
public static void main(String[] args) {
TeacherStudentManagement management = new TeacherStudentManagement();
Scanner scanner = new Scanner(System.in);
while (true) {
System.out.println("Teacher-Student Management");
System.out.println("1. Add Teacher");
System.out.println("2. Add Student");
System.out.println("3. Assign Student to Teacher");
System.out.println("4. Display Students of a Teacher");
System.out.println("5. Exit");
System.out.print("Enter your choice: ");
int choice = scanner.nextInt();
switch (choice) {
case 1:
System.out.print("Enter teacher name: ");
String teacherName = scanner.next();
management.addTeacher(teacherName);
break;
case 2:
System.out.print("Enter student name: ");
String studentName = scanner.next();
management.addStudent(studentName);
break;
case 3:
System.out.print("Enter student name: ");
String student
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