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。
// `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...
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...
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" ...
// 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...
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...
List data events occur when the contents of a mutablelistchange. Since the model — not the component — fires these events, you have to register a list data listener with the list model. If you have not explicitly created a list with a mutable list model, then your list is immutable, ...
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. ...
As the list is immutable when adding a new element to it, we willappend an element to a new list. Done using the following operators, Prepending operator (::) Appending operator+: Example objectMyClass{defmain(args:Array[String]){varprogLang=List("Java","Scala")println("Programming languag...