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| package com;
public class SequenceList<T> {
private T[] elements; private int elementsLength;
public SequenceList(int capacity) { elements = (T[])(new Object[capacity]); elementsLength = 0; }
public void clear() { elementsLength = 0; }
public boolean isEmpty() { return elementsLength==0; }
public int length() { return elementsLength; }
public int size() { return elements.length; }
public T get(int index) { return elements[index]; }
public void insert(T t) { elements[elementsLength++] = t; if (elementsLength >= elements.length/2) { expansion(); } }
public void insert(T t, int index) { for (int i = elementsLength-1; i >= index; i--) { elements[i+1] = elements[i]; } elements[index] = t; elementsLength++; if (elementsLength >= elements.length/2) { expansion(); } }
public T remove(int index) { T t = elements[index]; for (int i = index; i < elementsLength-1; i++) { elements[i] = elements[i+1]; } elementsLength--; if (elementsLength <= elements.length/4) { shrink(); } return t; }
public int indexOf(T t) { for (int i = 0; i < elementsLength; i ++) { if (elements[i].equals(t)) { return i; } } return -1; }
public void expansion() { T[] elementsNew = (T[])(new Object[elementsLength*2]); for (int i = 0; i < elementsLength; i ++) { elementsNew[i] = elements[i]; } elements = elementsNew; }
public void shrink() { T[] elementsNew = (T[])(new Object[elementsLength/2]); for (int i = 0; i < elementsLength; i++) { elementsNew[i] = elements[i]; } elements = elementsNew; }
public String toString() { String str = ""; for (int i = 0; i < elementsLength; i ++) { str += elements[i]; if (i!=elementsLength-1) { str += " "; } } return str; }
}
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