I\'ve written a code that reads a file and then takes it as input to create box
ID: 3585691 • Letter: I
Question
I've written a code that reads a file and then takes it as input to create box objects then creates an array of box objects. How would I begin to store the objects in a Linked List instead of an array? Or is there a way to convert the arrays to a linked list instead?
Package class:
import java.util.*;
import java.lang.*;
import java.io.*;
class Package{
private double l, h, w;
public Package(double l, double h, double w, Node next){
this.l = l;
this.h = h;
this.w = w;
}
public boolean isCube() {
return l == h && h == w;
}
public double getVolume() {
return l * w * h;
}
public void printDimensions() {
System.out.println("Dimensions in length, height, width: " + l + ", " + h + ", " + w);
}
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Package class:
public static Package[] readFile() {
Package array[] = null;
try {
File f = new File("input.txt");
Scanner sc = new Scanner(f);
double l, h, w;
int count = 0;
while(sc.hasNext()){
sc.nextLine();
count++;
}
array = new Package[count];
sc = new Scanner(f);
for(int i = 0; i < array.length; i++){
l = sc.nextDouble();
h = sc.nextDouble();
w = sc.nextDouble();
Package p = new Package(l, h, w);
array[i] = p;
}
}
catch (Exception e){
e.printStackTrace();
}
return array;
}
public static void getLargestPack(Package[] array) {
//finding largest package
Package maxp = array[0];
int maxpind = 0;
for(int i = 1; i < array.length; i++){
if(array[i].getVolume() > maxp.getVolume()) {
maxp = array[i];
maxpind = i;
}
}
System.out.println("index of largest package is " + maxpind);
maxp.printDimensions();
System.out.println("Volume: "+maxp.getVolume());
}
public static void main (String[] args) throws java.lang.Exception {
Package[] array = readFile();
getLargestPack(array);
LinkedList = new LinkedList(
//cubic and non cubic packages
int c = 0, nc = 0;
for(int i = 0; i < array.length; i++){
if(array[i].isCube()) c++;
else nc++;
}
System.out.println("number of cubic packages are: " + c);
System.out.println("number of non cubic packages are: " + nc);
//details of cubic packages
float sum_vol = 0;
for(int i = 0; i < array.length; i++){
if(array[i].isCube()){
array[i].printDimensions();
sum_vol += array[i].getVolume();
}
}
System.out.println("average volume is: " + sum_vol/c);
}
}
Explanation / Answer
first create array of packgae class in the method readffile and change the return type of the method to LinkedList<Package> and in the last line of the function instead of returnng the array return the Linkedlist
using return new LinkedList(Arrays.asList(array));
and remember to import for Linkedlist and Arrays
public static LinkedList<Package> readFile() {
Package array[] = null;
try {
File f = new File("input.txt");
Scanner sc = new Scanner(f);
double l, h, w;
int count = 0;
while(sc.hasNext()){
sc.nextLine();
count++;
}
array = new Package[count];
sc = new Scanner(f);
for(int i = 0; i < array.length; i++){
l = sc.nextDouble();
h = sc.nextDouble();
w = sc.nextDouble();
Package p = new Package(l, h, w);
array[i] = p;
}
}
catch (Exception e){
e.printStackTrace();
}
return new LinkedList(Arrays.asList(array));
}
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