java.util.HashMap.init()方法的使用及代码示例
本文整理了Java中java.util.HashMap.init()方法的一些代码示例，展示了HashMap.init()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。HashMap.init()方法的具体详情如下：
包路径：java.util.HashMap
类名称：HashMap
方法名：init
HashMap.init介绍
[英]This method is called from the pseudo-constructors (clone and readObject) prior to invoking constructorPut/constructorPutAll, which invoke the overridden constructorNewEntry method. Normally it is a VERY bad idea to invoke an overridden method from a pseudo-constructor (Effective Java Item 17). In this case it is unavoidable, and the init method provides a workaround.
[中]在调用constructorPut/constructorPutAll（调用重写的constructorNewEntry方法）之前，从伪构造函数（clone和readObject）调用此方法。通常，从伪构造函数调用重写的方法是一个非常糟糕的主意（有效的Java项目17）。在这种情况下，这是不可避免的，init方法提供了一种解决方法。
代码示例
代码示例来源：origin: robovm/robovm
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: robovm/robovm
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: org.apidesign.bck2brwsr/emul
/**
* Constructs an empty <tt>HashMap</tt> with the default initial capacity
* (16) and the default load factor (0.75).
*/
public HashMap() {
this.loadFactor = DEFAULT_LOAD_FACTOR;
threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
table = new Entry[DEFAULT_INITIAL_CAPACITY];
init();
}代码示例来源：origin: jtulach/bck2brwsr
/**
* Constructs an empty <tt>HashMap</tt> with the default initial capacity
* (16) and the default load factor (0.75).
*/
public HashMap() {
this.loadFactor = DEFAULT_LOAD_FACTOR;
threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
table = new Entry[DEFAULT_INITIAL_CAPACITY];
init();
}代码示例来源：origin: jtulach/bck2brwsr
/**
* Constructs an empty <tt>HashMap</tt> with the specified initial
* capacity and load factor.
*
* @param initialCapacity the initial capacity
* @param loadFactor the load factor
* @throws IllegalArgumentException if the initial capacity is negative
* or the load factor is nonpositive
*/
public HashMap(int initialCapacity, float loadFactor) {
if (initialCapacity < 0)
throw new IllegalArgumentException("Illegal initial capacity: " +
initialCapacity);
if (initialCapacity > MAXIMUM_CAPACITY)
initialCapacity = MAXIMUM_CAPACITY;
if (loadFactor <= 0 || Float.isNaN(loadFactor))
throw new IllegalArgumentException("Illegal load factor: " +
loadFactor);
// Find a power of 2 >= initialCapacity
int capacity = 1;
while (capacity < initialCapacity)
capacity <<= 1;
this.loadFactor = loadFactor;
threshold = (int)(capacity * loadFactor);
table = new Entry[capacity];
init();
}代码示例来源：origin: org.apidesign.bck2brwsr/emul
/**
* Constructs an empty <tt>HashMap</tt> with the specified initial
* capacity and load factor.
*
* @param initialCapacity the initial capacity
* @param loadFactor the load factor
* @throws IllegalArgumentException if the initial capacity is negative
* or the load factor is nonpositive
*/
public HashMap(int initialCapacity, float loadFactor) {
if (initialCapacity < 0)
throw new IllegalArgumentException("Illegal initial capacity: " +
initialCapacity);
if (initialCapacity > MAXIMUM_CAPACITY)
initialCapacity = MAXIMUM_CAPACITY;
if (loadFactor <= 0 || Float.isNaN(loadFactor))
throw new IllegalArgumentException("Illegal load factor: " +
loadFactor);
// Find a power of 2 >= initialCapacity
int capacity = 1;
while (capacity < initialCapacity)
capacity <<= 1;
this.loadFactor = loadFactor;
threshold = (int)(capacity * loadFactor);
table = new Entry[capacity];
init();
}代码示例来源：origin: com.mobidevelop.robovm/robovm-rt
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: MobiVM/robovm
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: ibinti/bugvm
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: com.gluonhq/robovm-rt
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: FlexoVM/flexovm
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: com.bugvm/bugvm-rt
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
int capacity = stream.readInt();
if (capacity < 0) {
throw new InvalidObjectException("Capacity: " + capacity);
}
if (capacity < MINIMUM_CAPACITY) {
capacity = MINIMUM_CAPACITY;
} else if (capacity > MAXIMUM_CAPACITY) {
capacity = MAXIMUM_CAPACITY;
} else {
capacity = Collections.roundUpToPowerOfTwo(capacity);
}
makeTable(capacity);
int size = stream.readInt();
if (size < 0) {
throw new InvalidObjectException("Size: " + size);
}
init(); // Give subclass (LinkedHashMap) a chance to initialize itself
for (int i = 0; i < size; i++) {
@SuppressWarnings("unchecked") K key = (K) stream.readObject();
@SuppressWarnings("unchecked") V val = (V) stream.readObject();
constructorPut(key, val);
}
}
}代码示例来源：origin: org.apidesign.bck2brwsr/emul
/**
* Returns a shallow copy of this <tt>HashMap</tt> instance: the keys and
* values themselves are not cloned.
*
* @return a shallow copy of this map
*/
public Object clone() {
HashMap<K,V> result = null;
try {
result = (HashMap<K,V>)super.clone();
} catch (CloneNotSupportedException e) {
// assert false;
}
result.table = new Entry[table.length];
result.entrySet = null;
result.modCount = 0;
result.size = 0;
result.init();
result.putAllForCreate(this);
return result;
}代码示例来源：origin: jtulach/bck2brwsr
/**
* Returns a shallow copy of this <tt>HashMap</tt> instance: the keys and
* values themselves are not cloned.
*
* @return a shallow copy of this map
*/
public Object clone() {
HashMap<K,V> result = null;
try {
result = (HashMap<K,V>)super.clone();
} catch (CloneNotSupportedException e) {
// assert false;
}
result.table = new Entry[table.length];
result.entrySet = null;
result.modCount = 0;
result.size = 0;
result.init();
result.putAllForCreate(this);
return result;
}代码示例来源：origin: ibinti/bugvm
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: MobiVM/robovm
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: com.bugvm/bugvm-rt
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: com.mobidevelop.robovm/robovm-rt
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: com.gluonhq/robovm-rt
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}代码示例来源：origin: FlexoVM/flexovm
/**
* Returns a shallow copy of this map.
*
* @return a shallow copy of this map.
*/
@SuppressWarnings("unchecked")
@Override public Object clone() {
/*
* This could be made more efficient. It unnecessarily hashes all of
* the elements in the map.
*/
HashMap<K, V> result;
try {
result = (HashMap<K, V>) super.clone();
} catch (CloneNotSupportedException e) {
throw new AssertionError(e);
}
// Restore clone to empty state, retaining our capacity and threshold
result.makeTable(table.length);
result.entryForNullKey = null;
result.size = 0;
result.keySet = null;
result.entrySet = null;
result.values = null;
result.init(); // Give subclass a chance to initialize itself
result.constructorPutAll(this); // Calls method overridden in subclass!!
return result;
}内容来源于网络，如有侵权，请联系作者删除！
