import java.util.Arrays;
import java.util.List;
import java.util.Random;
class DynamicArrayOfInts {
private int[] storage;
private int size;
private final int INITIAL_CAPACITY = 8;
private final int GROW_FACTOR = 2;
public DynamicArrayOfInts() {
storage = new int[INITIAL_CAPACITY];
size = 0;
}
private void rangeCheck(int index){
if (index < 0 || index >= size)
if(index < 0 || index >= size)
throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
}
private void ensureCapacity(int size_wanted) {
int max_capacity = storage.length;
if (size_wanted > max_capacity) {
max_capacity = max_capacity * GROW_FACTOR +1;
storage = Arrays.copyOf(storage, max_capacity); // increases array size + copy contents
}
}
public int size() {
return size;
}
public boolean equals(Object aThat) { // aThat is a DynamicArrayOfInts object
if (aThat==this) {
return true;
} else {
return false; // added so code would compile
}
}
public boolean equals(List<Integer> list) { // list is a LinkedList, or ArrayList, etc
return false; // added so code would compile
}
public int get(int position){
rangeCheck(position);
return storage [position];
}
public void set(int index, int value){
rangeCheck(index);
storage[index] = value;
}
public void insertAt(int index, int value) {
if (index < 0 || index > size)
throw new IndexOutOfBoundsException("Index: " + index + ", Size: "
+ size);
ensureCapacity(size + 1);
int moveCount = size - index;
if (moveCount > 0)
System.arraycopy(storage, index, storage, index + 1, moveCount);
storage[index] = value;
size++;
}
public void add(int value) {
if (size== storage.length)
{
ensureCapacity ((size+1)*2);
}
storage[size]= value;
size++;
}
public void removeAt(int index) {
rangeCheck(index);
int moveCount = size - index - 1;
if (moveCount > 0)
System.arraycopy(storage, index + 1, storage, index, moveCount);
size--;
}
public void printAll() {
for (int i= 0; i < size; i++) {
System.out.printf(" [%d]=%d", i, get(i));
}
System.out.println();
}
public static void main(String args[]) {
DynamicArrayOfInts list1 = new DynamicArrayOfInts();
list1.insertAt(0,1);
list1.insertAt(1,2);
list1.add(3);
// list1 is 1, 2, 3
System.out.print("list1: "); list1.printAll();
list1.set(2,100);
// list1 1 is 1, 2, 100
//System.out.print("list1: "); list1.printAll();
System.out.println("list1[2]=" + list1.get(2));
list1.removeAt(2);
// list1 is 1, 2
System.out.print("list1: "); list1.printAll();
DynamicArrayOfInts list2 = new DynamicArrayOfInts();
list2.insertAt(0,2);
list2.insertAt(0,3);
list2.insertAt(0,1);
list2.removeAt(1);
// list2 is 1, 2
System.out.print("list2: ");list2.printAll();
System.out.println("list1.size()=" + list1.size() + ", list2.size()=" + list2.size());
// list1 and list2 are equal
System.out.println("list1 equals list2 is " + list1.equals(list2));
list2.insertAt(2,3);
// list2 is 1, 2, 3
System.out.println("list1.size()=" + list1.size() + ", list2.size()=" + list2.size());
// list1 and list2 are not equal
System.out.println("list1 equals list2 is " + list1.equals(list2));
ArrayList list3 = new ArrayList();
list3.add(1);list3.add(2);list3.add(3);
System.out.println("list2 equals list3 is " + list2.equals(list3));
}
}
im getting this error C:\Users\papa\Desktop\DynamicArrayOfInts.java:150: cannot find symbol
symbol : class ArrayList
location: class DynamicArrayOfInts
ArrayList list3 = new ArrayList();
^
C:\Users\papa\Desktop\DynamicArrayOfInts.java:150: cannot fin
d symbol
symbol : class ArrayList
location: class DynamicArrayOfInts
ArrayList list3 = new ArrayList();
^
2 errors
Tool completed with exit code 1
2nd file
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Random;
import java.util.Vector;
public class PA1 {
static class ExecutionResults {
int size;
long linkedListTime;
long arrayListTime;
long dynamicArrayTime;
public ExecutionResults(int size) {
this.size = size;
}
}
public static void main(String[] args) throws Exception {
int choice = 4;
if (args.length >0)
choice = Integer.parseInt(args[0]);
// warm up the JVM
for (int i = 0; i < 100; i++)
CheckPerformance(1000,choice);
// print header
if (choice == 4)
System.out.printf("%-15s %-20s %-20s %-20s %n",
"size", "LinkedList", "ArrayList", "Dynamic Array");
// perform the benchmarking
displayResult(CheckPerformance(100,choice),choice);
displayResult(CheckPerformance(200,choice),choice);
displayResult(CheckPerformance(500,choice),choice);
displayResult(CheckPerformance(1000,choice),choice);
displayResult(CheckPerformance(2000,choice),choice);
displayResult(CheckPerformance(3000,choice),choice);
displayResult(CheckPerformance(4000,choice),choice);
displayResult(CheckPerformance(8000,choice),choice);
displayResult(CheckPerformance(16000,choice),choice);
}
private static void displayResult(ExecutionResults r, int choice) {
long min = 1;
if (choice == 4) {
min = Math.min(r.linkedListTime, Math.min(r.arrayListTime, r.dynamicArrayTime));
System.out.printf("%-15d %-10d (%-3.0f%%) %-10d (%-3.0f%%) %-10d (%-3.0f%%)%n",
r.size,
r.linkedListTime, (100 * (double) r.linkedListTime) / min,
r.arrayListTime, (100 * (double) r.arrayListTime) / min,
r.dynamicArrayTime, (100 * (double) r.dynamicArrayTime) / min);
}
}
`Inline Code Example Here`
private static ExecutionResults CheckPerformance(int size, int choice) {
Integer[] array = new Integer[size];
Random random = new Random(123456789L);
LinkedList<Integer> linkedList = new LinkedList<Integer>(Arrays.asList(-1));
ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(-1));
DynamicIntArray dynamicArray = new DynamicIntArray();
dynamicArray.add(-1);
for (int i = 0; i < array.length; i++)
array[i] = random.nextInt(Integer.MAX_VALUE);
ExecutionResults result = new ExecutionResults(size);
switch (choice) {
case 1:
long before = System.nanoTime();
insertIntoLinkedList(array, linkedList);
result.linkedListTime = (System.nanoTime() - before) / 1000;
break;
case 2:
before = System.nanoTime();
insertIntoArrayList(array, arrayList);
result.arrayListTime = (System.nanoTime() - before) / 1000;
break;
case 3:
before = System.nanoTime();
insertIntoDynamicArray(array, dynamicArray);
result.dynamicArrayTime = (System.nanoTime() - before) / 1000;
break;
case 4:
before = System.nanoTime();
insertIntoLinkedList(array, linkedList);
result.linkedListTime = (System.nanoTime() - before) / 1000;
before = System.nanoTime();
insertIntoArrayList(array, arrayList);
result.arrayListTime = (System.nanoTime() - before) / 1000;
before = System.nanoTime();
insertIntoDynamicArray(array, dynamicArray);
result.dynamicArrayTime = (System.nanoTime() - before) / 1000;
}
// check that they are equal
if (choice == 4 && !(linkedList.equals(arrayList) && dynamicArray.equals(arrayList)))
throw new RuntimeException("Lists not equal...");
return result;
}
private static void insertIntoLinkedList(Integer[] intArray, LinkedList<Integer> list) {
for (Integer integer : intArray) {
for (ListIterator<Integer> it = list.listIterator(); it.hasNext();) {
if (integer.compareTo(it.next()) >= 0) {
it.previous(); // should be added before element
it.add(integer);
break;
}
}
}
}
private static void insertIntoArrayList(Integer[] intArray, ArrayList<Integer> list) {
for (Integer integer : intArray) {
int list_size = list.size(); // on purpose: it is smarter to avoid calling size() every loop
for (int i = 0; i < list_size; i++) {
if (integer.compareTo(list.get(i)) >= 0) {
list.add(i, integer);
break;
}
}
}
}
private static void insertIntoDynamicArray(Integer[] numbers, DynamicIntArray array) {
for(Integer integer : numbers){
int value = integer.intValue();
// int array_size = array.size(); // on purpose: even faster would be to avoid calling size() every loop
for(int idx = 0; idx < array.size(); idx++){
if(value >= array.get(idx)){
array.insertAt(idx, value);
break;
}
}
}
}
}
here i am getting following error.i know i have alot of codes
C:\Users\papa\Desktop\PA1.java:144: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
private static void insertIntoDynamicArray(Integer[] numbers, DynamicIntArray array) {
^
C:\Users\papa\Desktop\PA1.java:72: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
DynamicIntArray dynamicArray = new DynamicIntArray();
^
C:\Users\papa\Desktop\PA1.java:72: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
DynamicIntArray dynamicArray = new DynamicIntArray();
^
3 errors
Tool completed with exit code 1
`Inline Code Example Here`
http://www.daniweb.com/software-development/java/9/contribute#
ali11 -1 Light Poster
Recommended Answers
Jump to Postsymbol : class ArrayList
location: class DynamicArrayOfInts
ArrayList list3 = new ArrayList();Right there. You need to import ArrayList to your program. At the top of the program where you have
import java....;lines in your DynamicArrayOfInts class, add one more line asimport java.util.ArrayList;to the import...
Jump to PostThe OP dumped every thing in the first post in the code tag... I didn't see that the ending of the code has this error as well...
Your error is from using wrong class name. You define DynamicArrayOfInts in your code, but you use DynamicIntArray instead? Der...
All 5 Replies
NormR1 563 Posting Sage Team Colleague
not sure why getting error
Please copy the full text of the error message and paste here.
Taywin 312 Posting Virtuoso
symbol : class ArrayList
location: class DynamicArrayOfInts
ArrayList list3 = new ArrayList();
Right there. You need to import ArrayList to your program. At the top of the program where you have import java....; lines in your DynamicArrayOfInts class, add one more line as import java.util.ArrayList; to the import...
ali11 -1 Light Poster
Thanks in my PA1 file i am still getting following error
C:\Users\papa\Desktop\PA1.java:144: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
private static void insertIntoDynamicArray(Integer[] numbers, DynamicIntArray array) {
^
C:\Users\papa\Desktop\PA1.java:72: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
DynamicIntArray dynamicArray = new DynamicIntArray();
^
C:\Users\papa\Desktop\PA1.java:72: cannot find symbol
symbol : class DynamicIntArray
location: class PA1
DynamicIntArray dynamicArray = new DynamicIntArray();
^
3 errors
Tool completed with exit code 1
NormR1 563 Posting Sage Team Colleague
The compiler can not find the definition for the DynamicIntArray class.
Is the class definition for that class on the classpath when you try to compile the PA1.java file?
Where is the definition for the DynamicIntArray class? Does it have a constructor without any args?
Taywin 312 Posting Virtuoso
The OP dumped every thing in the first post in the code tag... I didn't see that the ending of the code has this error as well...
Your error is from using wrong class name. You define DynamicArrayOfInts in your code, but you use DynamicIntArray instead? Der...
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