public class CopyOutput { private final java.util.Date date; ... public java.util.Date getDate() { return (java.util.Date)date.clone(); } } 1. 这里大家还要注意深拷贝和浅拷贝的问题。 为mutable类创建copy方法 既然要为mutable对象创建拷贝,那么相应的mutable类也需要提供一个copy方法来协助拷贝。
publicinterfaceMutableList<E> :List<E>,MutableCollection<E>{// Modification Operationsoverridefunadd(element:E):Booleanoverridefunremove(element:E):Boolean// Bulk Modification OperationsoverridefunaddAll(elements:Collection<E>):Boolean/** * Inserts all of the elements in the specified collection [eleme...
例如,在Java中,描述一个点的类型Point是mutable的,更改一个Point类型的对象P时,会直接更改当前对象在内存中的内容,如下图所示。 二、Immutable类型 Immutable类型表示不能够改变其值的类型。这里不能够改变其值指的是不能直接修改一个Immutable对象在内存中的内容,如果想要对这个对象中的属性值进行更改,会利用新的属性...
The following program removes the element5from themutablesetand print the remaining elements. Set<Integer>immutableSet=Set.of(1,2,3,4,5,6,7,8,9,10);// Immutable SetSet<Integer>mutableset=newHashSet<>(immutableSet);// Mutable SetIterator<Integer>iterator=mutableset.iterator();intnum;while...
// Create an immutable list of strings ImmutableList<string> colors = ImmutableList.Create("Red", "Green", "Blue"); // Iterate over all items in the list and print them foreach (string s in colors) { Console.WriteLine(s); } /* Example output: Red Green Blue */ Cet...
Exceptioninthread"main"java.lang.UnsupportedOperationException at java.base/java.util.AbstractList.add(AbstractList.java:153) at java.base/java.util.AbstractList.add(AbstractList.java:111)Copy Solution If we want to create a mutable list, that allows us to modify it, create anArrayList. ...
package test object listDemo { def main(args: Array[String]): Unit = { val list: List[String] = List("a", "b" ,"a") //为列表预添加元素 println("A" ...
Type in expressions for evaluation. Or try :help. scala> val set=Set[Int](1,2,3,4 用户1483438 2022/04/20 3570 scala 容器详细解释 容器javajavascript编程算法 scala 中的所有集合类位于 scala.collection 或 scala.collection.mutable,scala.collection.immutable,scala.collection.generic 中 Tim在路上 ...
// `addAll()` adds each element of mutable list to the `ImmutableList` // `build()` returns a newly created `ImmutableList` ImmutableList<String>immutableList=builder.addAll(mutableList) .add("Java") .build(); try{ // any attempt to modify the list will result in `UnsupportedOperation...
This article will discuss different ways to create a mutable, unmodifiable, immutable, and fixed-length empty list in Java. Mutable lists supports modification operations such as add, remove, and clear on it.Unmodifiable listsare “read-only” wrappers over other lists. They do not support add,...