week07

package week7;

public class Student {
	
	private String id;
	private String name;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String toString() {
		return "\t" + id + "\t" + name + "\n";
	}
	public Student(String id,String name){
		this.id=id;
		this.name=name;
	}
}



package week7;

public class Subject {
	Student list[];
	String id;
	String name;
	int maxsize;
	
	public Subject(String id,String name,int max){
		this.id=id;
		this.name=name;
		list=new Student[max];
		maxsize=0;
	}
	
	public boolean add(Student student){
		if (student ==null){
			return false;
		}
		if(list.length<=maxsize){
			return false;
		}
		list[maxsize]=student;
		maxsize++;
		return true;
	}
	
	public boolean remove(int index){
		int n=maxsize-1;
		if(index>=maxsize||index<0){
			return false;
		}
		for(int i=index;i<n;i++){
			list[i]=list[i+1];
		}
		list[n]=null;
		return true;
	}
	
	public int indexOf(String id){
		for(int i=0;i<list.length && list[i]!=null;i++){
			if(list[i].getId().equals(id))
				return i;
		}
		return -1;
	}
	
	public Student get(int index){
		return list[index];
	}
	
	public int size(){
		return maxsize;
	}
	public String tostring(){
		String info="";
		info+=id+"\t"+name+"\t\n";
		for(int i=0;i<list.length&&list[i]!=null;i++){
			info+=list[i].toString()+"\n";
		}
		return info;
	}
}




package week7;

import java.util.Scanner;

public class Driver { 
	private static Subject S1;
	public static int meau(){
		System.out.println("check class system");
		System.out.println("1.creat new subject");
		System.out.println("2.add a student");
		System.out.println("3.quit the subject");
		System.out.println("4.print subject details");
		System.out.println("5.exit");
		System.out.println("please choose your choice(1~5)");
		Scanner scan=new Scanner(System.in);
		int t=scan.nextInt();
		return t;
	}
	
	public static void creatsubject(){
		System.out.println("enter the subject id");
		Scanner scan=new Scanner(System.in);
		String subid=scan.next();
		System.out.println("enter the subject name");
		String name =scan.next();
		System.out.println("enter the maxsize of the subject");
		int maxsize=scan.nextInt();
	    S1=new Subject(subid,name,maxsize);
	}
	
	public static void addstudent(){
		System.out.println("enter the student id");
		Scanner scan=new Scanner(System.in);
		String stuid=scan.next();
		System.out.println("enter the student name");
		String stuname =scan.next();
		Student s1=new Student(stuid,stuname);
		S1.add(s1);
	}
	
	public static void quit(){
		System.out.println("enter the student id");
		Scanner scan=new Scanner(System.in);
		String stuid=scan.next();
		System.out.println("enter the student name");
		String stuname =scan.next();
		S1.indexOf(stuid);
		S1.remove(S1.indexOf(stuid));
	}
	
	public static void display(){
		System.out.println(S1.tostring());
	}
	
	public static void main(String[] args) {
		int o;
		while(true){
			o=meau();
			if(o==5){
				System.out.println("bye");
				break;
			}
			switch(o){
			case 1:creatsubject();
				break;
			case 2:addstudent();
				break;
			case 3:quit();
				break;
			case 4:display();
				break;
			}
		}
	}

}