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LinkedList.java
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LinkedList.java
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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package income.tax.calculator;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.file.Files;
import java.nio.file.Path;
/**
*
* @author Bat Bao
*/
//this class is only works with TaxPayer and its node
public class LinkedList {
Node head, tail;
//creating a new linkedlist
LinkedList() {
head = tail = null;
}
//this function checks for an empty LinkedList
public boolean isEmpty() {
return (head == null);
}
//this funtion clears the list
public void clear() {
head = tail = null;
}
//this function adds a node(to the tail)
public void addToEnd(TaxPayer x) {
if (head == null) {
head = tail = new Node(x, null);
} else {
Node temp = new Node(x, null);
tail.next = temp;
tail = temp;
}
}
//this function adds a node(to the head)
public void addToHead(TaxPayer x) {
if (head == null) {
head = tail = new Node(x, null);
} else {
Node temp = new Node(x, this.head);
head = temp;
}
}
//this function return size
int size() {
int i = 0;
Node p = head;
while (p != null) {
i++;
p = p.next;
}
return (i);
}
Node get(int k) {
int i = 0;
Node p = head;
while (p != null) {
if (i == k) {
return (p);
}
i++;
p = p.next;
}
return (null);
}
// function 1: load from text file
void loadFile(String fname) throws IOException {
File file = new File(fname);
if (file.createNewFile()) {
System.out.println("New Text File is created!");
}
RandomAccessFile f = new RandomAccessFile(fname, "r");
String s;
String[] a;
String code, name;
double income, deduct;
TaxPayer T;
while (true) {
s = f.readLine();
if (s == null || s.trim().equals("")) {
break;
}
a = s.split("\\|");
code = a[0].trim();
name = a[1].trim();
income = Double.parseDouble(a[2].trim());
deduct = Double.parseDouble(a[3].trim());
T = new TaxPayer(code, name, income, deduct);
addToEnd(T);
}
System.out.println("Load file succesfully!!!\n");
f.close();
}
//function 2: input and add to end
public void inputInfoEnd() {
TaxPayer Tp;
Validate validate = new Validate();
String code = validate.checkStringInput("Code : ");
String name = validate.checkStringInput("Name : ");
double income = validate.inputDouble("Income : ");
double deduct = validate.inputDouble("Deduction amount : ");
Tp = new TaxPayer(code, name, income, deduct);
addToEnd(Tp);
System.out.println("Add succesfully!!!\n");
}
//function 3: displays all the node in the list
public void traverse() {
Node x = head;
while (x != null) {
System.out.println("" + x.info.toString() + "");
x = x.next;
}
}
//function 4: save data
void saveTaxPayerToFile(String fname) throws IOException {
if (isEmpty()) {
return;
}
File f = new File(fname);
if (f.exists()) {
f.delete();
}
RandomAccessFile g = new RandomAccessFile(fname, "rw");
int n, i;
Node tax ;
n = size();
for (i = 0; i < n; i++) {
tax = get(i);
g.writeBytes(tax.info.code + " | " + tax.info.name + " | "
+ tax.info.income + " | " + tax.info.deduct + " | " + tax.info.tax + "\n");
}
g.close();
System.out.println("Save succesfully!!!\n");
}
//function 5: search then display the value in the node(include duplicate)
public void searchByCode() {
Validate validate = new Validate();
String srchval = validate.checkStringInput("Enter code: ");
Node x = head;
boolean found = false;
while (x != null) {
if (x.info.code.equals(srchval)) {
System.out.println("" + x.info.toString() + "");
found = true;
}
x = x.next;
}
if (found == false) {
System.out.println("Can't found the search requirements.\n");
}
}
//function 6: search by code then delete the node
public void deleteByCode() {
Validate validate = new Validate();
String srchval = validate.checkStringInput("Enter code: ");
Node x = head, y = head;
boolean found = false;
while (x != null) {
if (x.info.code.equalsIgnoreCase(srchval.trim())) {
if (x == head) {
head = x.next;
x = null;
} else {
y.next = x.next;
x.next = null;
x = y.next;
}
found = true;
} else {
y = x;
x = x.next;
}
}
if (found == false) {
System.out.println("Can't found the search requirements.\n");
} else {
System.out.println("Successfully delete the node!!!\n");
}
}
//function 7: sort by code
void sortByTcode() {
Node pi, pj;
TaxPayer x;
pi = head;
while (pi != null) {
pj = pi.next;
while (pj != null) {
if (pj.info.code.compareTo(pi.info.code) < 0) {
x = pi.info;
pi.info = pj.info;
pj.info = x;
}
pj = pj.next;
}
pi = pi.next;
}
}
//function 8: input a new person to top of the list
public void inputInfoHead() {
TaxPayer Tp;
Validate validate = new Validate();
String code = validate.checkStringInput("Code : ");
String name = validate.checkStringInput("Name : ");
double income = validate.inputDouble("Income : ");
double deduct = validate.inputDouble("Deduction amount : ");
Tp = new TaxPayer(code, name, income, deduct);
addToHead(Tp);
System.out.println("Add succesfully!!!\n");
}
//function 9: add after the input position
public void addAfterK() {
Validate validate = new Validate();
int k = validate.inputInt("Enter k: ");
TaxPayer x;
String code = validate.checkStringInput("Code : ");
String name = validate.checkStringInput("Name : ");
double income = validate.inputDouble("Income : ");
double deduct = validate.inputDouble("Deduction amount : ");
x = new TaxPayer(code, name, income, deduct);
Node temp = new Node(x, null);
Node iter = head;
int i = 0;
while (iter != null) {
if (i == k) {
temp.next = iter.next;
iter.next = temp;
break;
} else {
iter = iter.next;
i++;
}
}
}
// function 10: delete a person
public void deletePositionK() {
Validate validate = new Validate();
int k = validate.inputInt("Enter k: ");
Node x = head, y = head;
int i = 0;
while (x != null) {
if (i == k) {
y.next = x.next;
x.next = null;
x = y.next;
return;
} else {
y = x;
x = x.next;
i++;
}
}
}
}