// java code that create a class that provide an array of integers with add,
// remove, insert, sort
package javaapplication1;
import java.util.Arrays;
import java.util.Random;
public class JavaApplication1 {
private static final int DEFAULT_SIZE = 2;
private int[] arr;
int current = 0;
public JavaApplication1() {
this(DEFAULT_SIZE);
}
public JavaApplication1(int size) {
if (size > 0)
arr = new int[size];
else
arr = new int[DEFAULT_SIZE];
init();
}
private void init() {
Random rnd = new Random();
for (int i = 0; i < arr.length; i++)
arr[i] = rnd.nextInt(100);
}
private int size() {
return arr.length;
}
public void add(int n) {
resize();
arr[arr.length - 1] = n;
}
private void resize() {
int[] tmp = new int[arr.length + 1];
System.arraycopy(arr, 0, tmp, 0, arr.length);
arr = tmp;
}
private void reduce() {
int[] tmp = new int[arr.length - 1];
System.arraycopy(arr, 0, tmp, 0, arr.length - 1);
arr = tmp;
}
@Override
public String toString(){
String result = "";
for(int i = 0; i < arr.length; i++)
result += arr[i] + ", ";
return result;
}
public boolean equal(JavaApplication1 o) {
boolean result = true;
if(o == null)
result = false;
else if(this == o)
result = true;
else if(this.getClass() != o.getClass())
result = false;
else {
int i = 0;
while(i < arr.length && result) {
result = this.arr[i] == o.arr[i];
i++;
}
}
return result;
}
public void insert(int index, int n) {
resize();
for (int i = arr.length - 1; i > index; i--)
arr[i] = arr[i - 1];
arr[index] = n;
}
public void remove(int index) {
for (int i = index; i < arr.length - 1; i++)
arr[i] = arr[i + 1];
reduce();
}
public void sort() {
Arrays.sort(arr);
}
public void setValue(int i, int n) {
arr[i ] = n;
}
public void show() {
for (int i = 0; i < arr.length; i++)
System.out.println(arr[i]);
}
public static void main(String[] args) {
try
{
JavaApplication1 arr1 = new JavaApplication1();
JavaApplication1 arr2 = new JavaApplication1(3);
JavaApplication1 arr3 = new JavaApplication1(0);
System.out.println("arr1:");
arr1.show();
System.out.println("\narr2:");
arr2.show();
System.out.println("\narr3:");
arr3.show();
System.out.println("\narr3:");
arr3.add(100);
arr3.show();
System.out.println("\narr3:");
String s = arr3.toString();
System.out.println(s);
System.out.println("\narr1.equal(arr2):");
System.out.println(arr1.equal(arr2));
JavaApplication1 arr4 = new JavaApplication1();
System.out.println("\narr4:");
arr4.show();
arr4.setValue(0, 97);
arr4.setValue(0, 63);
System.out.println("\narr1.equal(arr4):");
System.out.println(arr4.equal(arr4));
arr3.insert(2, 333);
System.out.println("\narr3:");
arr3.show();
arr3.remove(0);
System.out.println("\narr3:");
arr3.show();
arr3.sort();
System.out.println("\narr3:");
arr3.show();
System.out.println("\narr3 size:");
System.out.println(arr3.size());
}
catch(Exception e) {
System.out.println(e);
}
}
}
/*
run:
arr1:
58
34
arr2:
69
73
24
arr3:
87
85
arr3:
87
85
100
arr3:
87, 85, 100,
arr1.equal(arr2):
false
arr4:
97
6
arr1.equal(arr4):
true
arr3:
87
85
333
100
arr3:
85
333
100
arr3:
85
100
333
arr3 size:
3
*/
