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Java数据结构源码究竟包含哪些核心组件?
- 行业动态
- 2024-10-08
- 2
Java数据结构源码可以在GitHub上找到,例如ArrayList、LinkedList等。
Java中的数据结构源码非常复杂,涉及到许多类和方法,这里我将为您提供一个简单的示例,即ArrayList的源码解析。
import java.util.Arrays; public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable { private static final int DEFAULT_CAPACITY = 10; private static final Object[] EMPTY_ELEMENTDATA = {}; private static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {}; transient Object[] elementData; // nonprivate to simplify nested class access private int size; public ArrayList() { this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA; } public ArrayList(int initialCapacity) { if (initialCapacity > 0) { this.elementData = new Object[initialCapacity]; } else if (initialCapacity == 0) { this.elementData = EMPTY_ELEMENTDATA; } else { throw new IllegalArgumentException("Illegal Capacity: " + initialCapacity); } } public boolean add(E e) { ensureExplicitCapacity(size + 1); elementData[size++] = e; return true; } public E get(int index) { rangeCheck(index); return elementData(index); } public E set(int index, E element) { rangeCheck(index); E oldValue = elementData(index); elementData[index] = element; return oldValue; } public void ensureExplicitCapacity(int minCapacity) { modCount++; if (minCapacity elementData.length > 0) grow(minCapacity); } private void grow(int minCapacity) { // overflowconscious code int oldCapacity = elementData.length; int newCapacity = oldCapacity + (oldCapacity >> 1); if (newCapacity minCapacity < 0) newCapacity = minCapacity; if (newCapacity MAX_ARRAY_SIZE > 0) newCapacity = hugeCapacity(minCapacity); // minCapacity is usually close to size, so this is a win: elementData = Arrays.copyOf(elementData, newCapacity); } private static int hugeCapacity(int minCapacity) { if (minCapacity < 0) // overflow throw new OutOfMemoryError(); return (minCapacity > MAX_ARRAY_SIZE) ? Integer.MAX_VALUE : MAX_ARRAY_SIZE; } private void rangeCheck(int index) { if (index >= size || index < 0) throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size); } }
这是一个简化版的ArrayList实现,仅包含了部分方法,完整的ArrayList实现还包括其他方法,如remove、clear等,还有许多其他的Java数据结构,如LinkedList、HashSet、HashMap等,它们的源码同样非常复杂,如果您需要详细了解某个具体的数据结构的源码,请告诉我,我会为您提供相应的代码片段。
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