자바 7주차 과제

import java.util.*;
public class Course {
  private String courseName;
  private String[] students=new String[100]; 
  private int numberOfStudents;
    
  public Course(String courseName) { 
    this.courseName = courseName;
  }
  
  public void addStudent(String student) {
	  if (numberOfStudents >= students.length) {
  	      String[] temp = new String[numberOfStudents+1];
  	      System.arraycopy(students, 0, temp, 0, students.length);
  	      students = temp;
	  }
	  students[numberOfStudents]=student;
	  numberOfStudents++;
	  }
  
  public String[] getStudents() { 
    return students;
  }

  public int getNumberOfStudents() {
    return numberOfStudents;
  }  

  public String getCourseName() { 
    return courseName;
  }  
  
  public void dropStudent(String student) {
    for(int i=0; i<numberOfStudents; i++) {
    	if(students[i]==student){
    		students[i]="";
    		numberOfStudents--;
    		for(int j=i; j<numberOfStudents; j++){
    			students[j]=students[j+1];
    		}
    	}
    	else {
    	}
    }
  }
  
  public void clear() {
	  while(numberOfStudents!=0) {
		  students[0]="";
		  numberOfStudents--;
		  for(int j=0; j<numberOfStudents; j++){
  			students[j]=students[j+1]; 
	      }
	  }
  }
  }
 

import java.util.*;

public class TestCourse {
	  public static void main(String[] args) {
	    Course course1 = new Course("Object-Oriented Programming");
	    Course course2 = new Course("Data Structures");

	    course1.addStudent("Peter Jones");
	    course1.addStudent("Brian Smith");
	    course1.addStudent("Anne Kennedy");

	    course2.addStudent("S1");
	    course2.addStudent("S2");
	    course2.addStudent("S3");
	    course2.addStudent("S4");
	    
	    System.out.println("Number of students in course1: "
	      + course1.getNumberOfStudents());
	    String[] students1 = course1.getStudents();
	    for (int i = 0; i < course1.getNumberOfStudents(); i++)
	      System.out.print(students1[i] + ", ");
	    System.out.println();
	    
	    System.out.println("Number of students in course2: "
	      + course2.getNumberOfStudents());
	    String[] students2 = course2.getStudents();
	    for (int i = 0; i < course2.getNumberOfStudents(); i++)
	      System.out.print(students2[i] + ", ");
	    System.out.println();
	    
	    course1.dropStudent("Peter Jones");
	    System.out.println("Number of students in course1 after drop Peter Jones: "
	    	      + course1.getNumberOfStudents());
	    String[] students3 = course1.getStudents();
	    	    for (int i = 0; i < course1.getNumberOfStudents(); i++)
	    	      System.out.print(students3[i] + ", ");
	    System.out.println();
	    	    
	    course1.clear();
	    System.out.println("Number of students in course1 after clear: "
	    	      + course1.getNumberOfStudents());
	    	    
	    course2.dropStudent("S2");
	    System.out.println("Number of students in course2 after drop S2: "
	    	      + course2.getNumberOfStudents());
	    	    String[] students4 = course2.getStudents();
	    	    for (int i = 0; i < course2.getNumberOfStudents(); i++)
	    	      System.out.print(students4[i] + ", ");
	    	    System.out.println();
	    	    
	    course2.clear();
	    System.out.println("Number of students in course2 after clear: "
	    	    	      + course2.getNumberOfStudents());
	  }
	}