(Homework Solution): Please suggest what I should do to creat this project in Java. This is the codes that is



import java.util.*;
public class LinkedString {
LinkedList<Character> string;
int numberOfChars;

//Constructor using char array
LinkedString(char[] value){
numberOfChars = 0;
string = new LinkedList<Character>();
for(char c : value) {

//Constructor using string
LinkedString(String Original){
numberOfChars = 0;
string = new LinkedList<Character>();
for(int i = 0; i<Original.length() ; i++) {

//Implements charAt function
char charAt(int index) {
return (string.get(index).charValue());

//COncatenate two LinkedStrings
LinkedString concat(LinkedString str) {
for(int i = 0; i<str.length() ; i++) {
return this;

//Check if a LinkedString is empty
boolean isEmpty() {
if(this.length() == 0)return true;
return false;

//returns length of LinkedString
int length() {
return this.numberOfChars;

//Return substring of LinkedString
LinkedString substring(int beginIndex, int endIndex) {
String tmp = “”;
Iterator<Character> it = string.listIterator(beginIndex);
int count = beginIndex;
while(count <= endIndex && it.hasNext()) {
tmp += it.next();
LinkedString ret = new LinkedString(tmp);
return ret;


Please find the test file below :


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Before;
import org.junit.Test;

public class LinkedStringTest {
private LinkedString lsA;
private LinkedString lsB;
static    char[] cArr = {‘T’, ‘e’, ‘s’, ‘t’, ‘C’, ‘h’, ‘a’, ‘r’, ‘s’};
static    String testString = “TestString”;

public void setUp() throws Exception
lsA = new LinkedString(testString);
lsB = new LinkedString(cArr);


public void charAtTest()
for(int i = 0; i<cArr.length ; i++) {
assertEquals(cArr[i], lsB.charAt(i));

for(int i = 0; i<cArr.length ; i++) {
assertEquals(testString.charAt(i), lsA.charAt(i));


public void concatTest()
LinkedString tmp = lsA.concat(lsB);
for(int i = 0; i<testString.length() ; i++) {
assertEquals(testString.charAt(i), tmp.charAt(i));
for(int i = 0; i<cArr.length ; i++) {
assertEquals(cArr[i], tmp.charAt(i + testString.length()));

public void isEmptyTest()
LinkedString tmp = new LinkedString(“”);

public void lengthTest()
LinkedString tmp = new LinkedString(“”);

public void substringTest()
LinkedString tmp = lsA.substring(0, 3);
for(int i = 0; i<4 ; i++) {
assertEquals(cArr[i], tmp.charAt(i));



Please find the screenshot of output below :

0 t e® d 돼 Q,Q.· ▼ ▽ || 48e @Test 49 50 51 52 53 54 inished after 0.093 seconds public void isEmptyTest() Runs: 5/5 Linkedstring tmp = new LinkedSt ring (); assertFalse(1sA. isEmpty ( ) ) ; assertFalse(1sB.isEmptyO): assertTrue(tmp.isEmpty)) Errors: 0 Failures: 0 LinkedString Test [Runner: JUnit 5] (0.004 s) concatTest (0.0015) 品isEmptyTest (0.000 s) charAtTest (0.000 s) lengthTest (0.000 s) substringTest (0.003 s) 56 57 58e @Test 59 60 61 62 63 64 65 public void lengthTest() LinkedString tmpnew LinkedString( assertEquals ( 16, lsA·length ( ) ) ; assertEquals (9,lsB.length)): assertEquals ( Θ , tp , length ( ) ) ; 67 8 Test public void substringTest() 70 71 72 73 74 75 76 LinkedString tmp-lsA. substring(0, 3); for(int i =0; 1.4 ; i++) { assertEquals(CArr[i], tmp.charAt(i)); E Failure Trace EE77 78 Problems @Javadoc Declaration Console 3 <terminated> LinkedStringTest JUnit]/usr/lib/jvm/java-8-oracle/bin/java (30-Sep-2018, 3:19:51 PM)

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