Zaehyeon's BLOG

import java.util.Scanner;

public class SinglyLinkedList {
    private static class Node<Integer> {     // Node
        private int element;                   // element
        private Node<Integer> next;            // nextnode

        public Node(int e, Node<Integer> n) {  // setNode
            element = e;
            next = n;
        }

        public int getElement() {              // Get Element
            return element;
        }

        public Node<Integer> getNext() {       // Get Next Node
            return next;
        }

        public void setNext(Node<Integer> n) { // Set Next Node
            next = n;
        }
    }

    private static Node<Integer> head = null;// Initial LinkedList
    private static Node<Integer> tail = null;// Initial LinkedList
    private static int size = 0;             // Initial LinkedList

    public SinglyLinkedList(){}

    public static int size() {               // Get Size
        return size;
    }

    public static boolean isEmpty() {        // Empty = true, Not Empty = false
        return size() == 0;
    }

    public static int first() {              // Get First Element
        if (isEmpty()) return 0;               // Empty check
        return head.getElement();
    }

    public static int last() {               // Get Last Element
        if (isEmpty()) return 0;               // Empty check
        return tail.getElement();
    }

    public static void addFirst(Integer e) { // Add to First
        head = new Node<>(e, head);            // Make Head
        if (size == 0) {
            tail = head;
        }
        size++;
    }

    public static void addLast(Integer e) { // Add to Last
        Node<Integer> newest = new Node<>(e, null); // Make Last Node
        if (isEmpty()) {
            head = newest;
        }
        else {
            tail.setNext(newest);
        }
        size++;
        tail = newest;
    }

    public static void removeFirst(){        // Remove First Node
        if (isEmpty()) return;
        head = head.getNext();
        size--;
        if (size == 0) {
            tail = null;
        }
    }
    /*------------------------------------------------------
    |                 여기까지가 기본으로 준 함수                 |
    |_____________________________________________________*/
    public static void insertion(Integer e, int idx){ // Add to Index
        if (idx > size || idx < 0) {                    // Check Over/UnderFlow
            System.out.println("List Over/UnderFlow!");
            return;
        }
        if (idx == size){
            addLast(e);
            return;
        }
        if (idx == 0){
            addFirst(e);
            return;
        }
        Node<Integer> tmp = head;
        for(int i = 0; i < idx - 1; i++){                    // Go to Index - 1
            tmp = tmp.getNext();
        }
        Node<Integer> insert = new Node<>(e, tmp.getNext()); // Make New Node
        tmp.setNext(insert);                                 // Input New Node to Index
        size++;
    }

    public static void removing(int idx){                  // Remove Index's Node
        if (isEmpty()){                                      // Empty Check
            System.out.println("No Element in Linked List!");
            return;
        }
        if (idx < 0 || idx > size - 1) {                     // Check Over/UnderFlow
            System.out.println("List Over/UnderFlow!");
            return;
        }
        if (idx == 0){
            removeFirst();
            return;
        }
        Node<Integer> tmp = head;
        for(int i = 0; i < idx - 1; i++){                    // Go to Index - 1
            tmp = tmp.getNext();
        }
        if (idx == size - 1) {                               // If New Node == Last
            tmp.setNext(null);
            size--;
            return;
        }
        tmp.setNext(tmp.getNext().getNext());                // Else Linked Next Next Node
        size--;
        if (isEmpty()) {
            tail = null;
        }
    }

    public static void pall(){                             // Print All Element
        if (isEmpty()){                                      // Check Empty
            System.out.println("No Element in Linked List!");
            return;
        }
        Node<Integer> tmp = head;
        System.out.println("LinkedList[0] = "  + tmp.getElement()); // Print First Element
        for(int i = 0; i < size - 1; i++){                          // Searching all index
            tmp = tmp.getNext();
            System.out.println("LinkedList[" + (i + 1) + "] = " + tmp.getElement()); // Print Index, Element
        }
    }

    public static void main(String[] args) {                                     // Main
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("------------------------------------------------");
            System.out.println("0 = End, 1 = Insert, 2 = Removing, 3 = Print All");
            System.out.println("------------------------------------------------");
            System.out.print("Case : ");
            int Case = sc.nextInt();
            if (Case == 0) {
                System.out.println("Program is End!");
                break;
            }
            else if (Case == 1) {
                System.out.print("Element : ");
                int text = sc.nextInt();
                System.out.print("Index : ");
                int idx = sc.nextInt();
                insertion(text, idx);
            }
            else if (Case == 2) {
                System.out.print("Index : ");
                int idx = sc.nextInt();
                removing(idx);
            }
            else {
                System.out.println("------------------------------------------------");
                pall();
            }
        }
        sc.close();
    }
}

package sils3;

import java.util.ArrayList;

import java.util.Scanner;

public class StudentManager {

Scanner Scanner = new Scanner(System.in);

ArrayList<StudentInfo> SIL = new ArrayList<StudentInfo>();

StudentManager(){

start();

Scanner.close();

}

public void sign() { /* Sign Up Method */

String sName;

int sAge;

int sSID;

String sPhoneN;

System.out.print("Input Name : "); /* input Name */

sName = Scanner.next();

System.out.print("Input Age : "); /* input Age */

sAge = Scanner.nextInt();

System.out.print("Input Student ID : "); /* input StudentID */

sSID = Scanner.nextInt();

System.out.print("Input Phone Number : "); /* input PhoneNumber */

sPhoneN = Scanner.next();

StudentInfo stInfo = new StudentInfo(sName, sAge, sSID, sPhoneN);

System.out.println(stInfo);

SIL.add(stInfo); /* Add to ArrayList */

}

public void modify() { /* Modify Method */

int cnt = 1; /* for "No." Print */

int modiN;

int mAge, mSID;

String mName, mPhoneN;

System.out.println("No.          Name         Age          Student ID   Phone Number");

for ( StudentInfo student : SIL ) {

System.out.format("%-13d%-13s%-13d%-13d%-13s\n", cnt, student.getUserName(), student.getUserAge(), student.getUserSID(), student.getUserPhoneN());

cnt++;

}

System.out.print("==> Input modify No. : ");

modiN = Scanner.nextInt();

System.out.print("Input Name : "); /* Name input */

mName = Scanner.next();

System.out.print("Input Age : "); /* Age input */

mAge = Scanner.nextInt();

System.out.print("Input Student ID : "); /* StudentID input */

mSID = Scanner.nextInt();

System.out.print("Input Phone Number : "); /* PhoneNumber input */

mPhoneN = Scanner.next();

StudentInfo stInfo = new StudentInfo(mName, mAge, mSID, mPhoneN);

SIL.set(modiN-1, stInfo); /* Set ArrayList's (modiN-1)th Index Data */

}

public void delete() {

int cnt = 1; /* for "No." print */

System.out.println("No.          Name         Age          Student ID   Phone Number");

for ( StudentInfo student : SIL ) {

System.out.format("%-13d%-13s%-13d%-13d%-13s\n", cnt, student.getUserName(), student.getUserAge(), student.getUserSID(), student.getUserPhoneN());

cnt++;

}

System.out.print("==> Input delete No. : ");

int delN = Scanner.nextInt();

SIL.remove(delN-1); /* Remove ArrayList's (delN-1)th Index Data */

}

public void list() {

System.out.println("Name         Age          Student ID   Phone Number");

for ( StudentInfo student : SIL ) {

System.out.format("%-13s%-13d%-13d%-13s\n", student.getUserName(), student.getUserAge(), student.getUserSID(), student.getUserPhoneN() );

}

}

public void namesearch() {

System.out.print("Input Search Name : ");

String nsName = Scanner.next();

int cnt = 1, cntn = 0; /* cnt for "No." print cntn for PrintForm only First */

for ( StudentInfo student : SIL ) {

if (student.getUserName().equals(nsName)) { /* if student's name == nsName */

if (cntn == 0) { /* First Form */

System.out.println("No.          Name         Age          Student ID   Phone Number");

cntn++;

}

System.out.format("%-13d%-13s%-13d%-13d%-13s\n", cnt ,student.getUserName(), student.getUserAge(), student.getUserSID(), student.getUserPhoneN() );

}

cnt++;

}

}

public void IDsearch() {

System.out.print("Input Search ID : ");

int nsSID = Scanner.nextInt();

int cnt = 1, cntn = 0; /* cnt for "No." print cntn for PrintForm only First */

for ( StudentInfo student : SIL ) {

if (student.getUserSID() == nsSID) { /* if student's ID == nsSID */

if (cntn == 0) { /* First Form */

System.out.println("No.          Name         Age          Student ID   Phone Number");

cntn++;

}

System.out.format("%-13d%-13s%-13d%-13d%-13s\n", cnt ,student.getUserName(), student.getUserAge(), student.getUserSID(), student.getUserPhoneN() );

}

cnt++;

}

}

public void quit() {

System.out.println("Porgram Finished");

}

void start() {

while(true) {

System.out.println("--------------------------------------------------------------------------");

System.out.println("1) sign up 2) modify 3) delete 4) list 5) name search 6) ID search 7) Quit");

System.out.println("--------------------------------------------------------------------------");

int caseN = Scanner.nextInt();

if (caseN == 1) {

sign();

}

if (caseN == 2) {

modify();

}

if (caseN == 3) {

delete();

}

if (caseN == 4) {

list();

}

if (caseN == 5) {

namesearch();

}

if (caseN == 6) {

IDsearch();

}

if (caseN == 7) {

quit();

break;

}

}

}

}

package sils3;

public class Run {

public static void main(String[] args) {

new StudentManager(); /* Create StudentManager Class */

}

}

package sils3;

public class UserInfo {

private String userName;

private int userAge;

public UserInfo(String uName, int uAge) {

userName = uName;

userAge = uAge;

}

void setUserName(String uName) {

userName = uName;

}

void setUserAge(int uAge) {

userAge = uAge;

}

String getUserName() {

return userName;

}

int getUserAge() {

return userAge;

}

}

package sils3;

public class StudentInfo extends UserInfo {

private int userSID;

private String userPhoneN;

public StudentInfo(String uName, int uAge, int uSID, String uPhoneN) {

super(uName, uAge);

userSID = uSID;

userPhoneN = uPhoneN; 

}

void setUserSID(int uSID) {

userSID = uSID;

}

void setUserAge(String uPhoneN) {

userPhoneN = uPhoneN;

}

int getUserSID() {

return userSID;

}

String getUserPhoneN() {

return userPhoneN;

}

}