Algorithm.java

package v1;

import java.util.LinkedList;
import java.util.Scanner;

public abstract class Algorithm {

	protected LinkedList<Integer> datas = new LinkedList<Integer>();
	public Scanner sc = new Scanner(System.in);
	public Algorithm() {
	}
	private void load(){
		System.out.println("How much number do you want to load?");
		for(int count = sc.nextInt(); count>0; count--){
			Integer row = (Integer) sc.nextInt();
			this.datas.add(row);
		}
	}
	protected abstract void operation();
	private void print(){
		System.out.println(datas);
	}
	public void action(int step){
		if(step ==1){
			this.load();
		}else if(step == 2){
			this.operation();
		}else if(step == 3){
			this.print();
		}
	}
}

ArrayStack.java

package v1;

public class ArrayStack implements Stack{
	private int[] datas;
	private int count=0;
	
	
	public ArrayStack(int size) {
		this.datas = new int[size];
	}

	@Override
	public void push(int val){
		this.datas[count++] = val;
	}

	@Override
	public int popd(){
		return this.datas[count--];
	}
}

Person.java

package v1;

public abstract class Person {
	String firstName;
	String secondName;
	public Person(String firstName, String secondName) {
		super();
		this.firstName = firstName;
		this.secondName = secondName;
	}
	public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public String getSecondName() {
		return secondName;
	}
	public void setSecondName(String secondName) {
		this.secondName = secondName;
	}
	public String getName(){
		return this.firstName+" "+this.secondName;
	}
	@Override
	public String toString() {
		return "Person [firstName=" + firstName + ", secondName=" + secondName
				+ "]";
	}
	
}

PersonSet.java

package v1;

public class PersonSet {
	private Person[] bank;
	private int count=0;
	public PersonSet(int size) {
		this.bank = new Person[size];
	}
	public void add(Person obj){
		this.bank[count++] = obj;
	};
	public Person pop(Person obj){
		return this.bank[count--];
	}
	public void printAll(){
		for(int i=0; i<count; i++){
			System.out.println((i+1)+". "+this.bank[i]);
		}
	}

}

PersonSetTest.java

package v1;

public class PersonSetTest {

	public PersonSetTest() {
		// TODO Auto-generated constructor stub
	}

	public static void main(String[] args) {
		PersonSet set = new PersonSet(10);
		Student p = new Student("John", "Smith");
		System.out.println(p);
		set.add(p);
		TeachingStaff ts = new TeachingStaff("John", "Smith", 5);
		System.out.println(ts);
		set.add(ts);
		
		TechnicalStaff ts2 = new TechnicalStaff("John", "Smith", 5);
		System.out.println(ts2);
		set.add(ts2);
		System.out.println("\tPerson list:");
		set.printAll();
	}

}

Researcher.java

package v1;

public class Researcher extends Staff{
	public int degree;

	public Researcher(String firstName, String secondName, int degree) {
		super(firstName, secondName);
		this.degree = degree;
	}

	public Researcher(String firstName, String secondName) {
		super(firstName, secondName);
		// TODO Auto-generated constructor stub
	}

	public int getDegree() {
		return degree;
	}

	public void setDegree(int degree) {
		this.degree = degree;
	}

}

ReverseAlgorithm.java

package v1;

import java.util.Collections;

public class ReverseAlgorithm extends Algorithm {

	public ReverseAlgorithm() {
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void operation() {
		Collections.reverse(this.datas);
	}

}

SortAlgorithm.java

package v1;

import java.util.Collections;

public class SortAlgorithm extends Algorithm {

	public SortAlgorithm() {
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void operation() {
		Collections.sort(this.datas);
	}

}

SortReverseAlgorithm.java

package v1;

import java.util.Collections;

public class SortReverseAlgorithm extends Algorithm {

	public SortReverseAlgorithm() {
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void operation() {
		Collections.sort(this.datas);
		Collections.reverse(this.datas);
	}

}

Stack.java

package v1;

public interface Stack {

	public abstract void push(int v);

	public abstract int popd();

}

Staff.java

package v1;

public abstract class Staff extends Person {

	public Staff(String firstName, String secondName) {
		super(firstName, secondName);
		// TODO Auto-generated constructor stub
	}

}

Student.java

package v1;

public class Student extends Person {
	
	public Student(String firstName, String secondName) {
		super(firstName, secondName);
		// TODO Auto-generated constructor stub
	}

	@Override
	public String toString() {
		return "Student [getName()=" + getName() + "]";
	}

}

TeachingStaff.java

package v1;

public class TeachingStaff extends Staff {
	public int hours;

	public TeachingStaff(String firstName, String secondName) {
		super(firstName, secondName);
	}
	public TeachingStaff(String firstName, String secondName, int degree) {
		super(firstName, secondName);
		hours = degree;
	}

	public int getHours() {
		return hours;
	}
	public void setHours(int hours) {
		this.hours = hours;
	}
	@Override
	public String toString() {
		return "TeachingStaff [Degree=" + hours + ", getName()=" + getName()
				+ "]";
	}
	
}

TechnicalStaff.java

package v1;

public class TechnicalStaff extends Staff{
	int DepartmentId;

	public TechnicalStaff(String firstName, String secondName, int departmentId) {
		super(firstName, secondName);
		DepartmentId = departmentId;
	}

	public int getDepartmentId() {
		return DepartmentId;
	}

	public void setDepartmentId(int departmentId) {
		DepartmentId = departmentId;
	}

	@Override
	public String toString() {
		return "TechnicalStaff [DepartmentId=" + DepartmentId + ", getName()="
				+ getName() + "]";
	}



}