src/hw3/task3/MyArrayList.java - hw_3 - Elyumusa/SberJavaCourseBeginner

src/hw3/task3/MyArrayList.java
82 строки2 KB
Elyumusa
Task 3 updated
08 апр 2025, 14:08
08 апр 2025, 14:088767c2c
package hw3.task3;

import java.util.Arrays;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.function.Consumer;
import java.util.stream.Stream;

public class MyArrayList<T> implements Iterable<T> {
    @Override
    public Iterator<T> iterator() {
        return new MyArrayListIterator();
    }
    protected T[] data;
    private int length;
    public int size(){
        return length;
    }
    public MyArrayList(){
        data = (T[]) new Object[10];
        length = 0;
    }
    public void add(T element){
        ensureCapacity();
        data[length]=element;
        length++;
    }
    private void ensureCapacity(){
        if(length == data.length){
            data= Arrays.copyOf(data, data.length*2);}
    }
    public boolean contains(T element){

        return Arrays.stream(data,0,length).anyMatch(el -> el == element);

    }
    public boolean remove(T element){
            for(int i=0;i<data.length;i++){
                if (data[i] == element) {
                    System.arraycopy(data,i+1,data,i,length-i-1);
                    data[--length]=null;

                    if(length>0 && length<data.length/4){
                        data = Arrays.copyOf(data,data.length/2);
                    }
                    return true;
                }

            }
        return false;
    }

    @Override
    public void forEach(Consumer<? super T> action) {
        for(T el: this){
        action.accept(el);
        }
    }
    class MyArrayListIterator implements  Iterator<T>{
        //MyArrayList<T> arrayList;
//        public MyArrayListIterator(MyArrayList<T> arrayList){
//            this.arrayList=arrayList;
//        }
        private int currentIndex=0;

        @Override
        public boolean hasNext() {
            return currentIndex<length;
        }

        @Override
        public T next() {

            return data[currentIndex++];
        }

        @Override
        public void remove() {
            Iterator.super.remove();
        }
    }
    }