The JDK providesCollections.unmodifiableXXXmethods, but in our opinion, these can be unwieldy and verbose; unpleasant to use everywhere you want to make defensive copies unsafe: the returned collections are only truly immutable if nobody holds a reference to the original collection inefficient: the ...
3. 对于空间使用的节省,后面builder源码分析时候,会说到 ImmutableCollections类中将所有write方法都置为throw new UnsupportedOperationException()操作,这里需要说明的是抽象类ImmutableCollection.Builder Guava提供了构造器方式的构造不可变集合,如下代码所示: publicvoidtestBuilder() {ImmutableList.Builder<Integer> builder ...
Defining Immutable CollectionsBefore I discuss the internals of immutable collections, I have to define what they are. An immutable collection is a collection of instances that preserves its structure all the time and disallows element-level assignments, while still offering APIs to perform mutations....
对ToImmutable 命名空间中的不可变集合不必要地调用了 System.Collections.Immutable 方法。 规则说明 System.Collections.Immutable 命名空间包含用于定义不可变集合的类型。 此规则分析以下不可变集合类型: System.Collections.Immutable.ImmutableArray<T> System.Collections.Immutable.ImmutableList<T> System.Collections.Immu...
Java provides several ways to create immutable collections. One way is to use theCollections.unmodifiableXXX()methods, which wrap an existing collection and return an unmodifiable view of it. For example, theCollections.unmodifiableList()method returns an unmodifiable view of a list. Here’s an exa...
Guava学习总结之 - 6 - Collections - Immutable collections 不可变集合应该在一切能后使用的场合使用,因为 如果程序内使用了非安全的库,那么我们能够保证传入的集合不会被修改。 线程安全 内存使用更加高效。 可以作为一个常量,被任何地方直接引用 Guava给自己特有和JAVA本地的一些集合实提供了对应的不可变版本如下:...
When developing my immutable collections library, I spent a lot of time on usability. After all, if a library is not useful then what’s the point?A big portion of usability is being able to work with existing frameworks and technologies. For .Net and collections that means items l...
对System.Collections.Immutable 命名空间中的不可变集合不必要地调用了 ToImmutable 方法。 规则说明 System.Collections.Immutable 命名空间包含用于定义不可变集合的类型。 此规则分析以下不可变集合类型: System.Collections.Immutable.ImmutableArray<T> System.Collections.Immutable.ImmutableList<T> ...
Immutable Collections Example publicstaticfinalImmutableSet<String>COLOR_NAMES=ImmutableSet.of("red","orange","yellow","green","blue","purple");classFoo{finalImmutableSet<Bar>bars;Foo(Set<Bar>bars) {this.bars=ImmutableSet.copyOf(bars);// defensive copy!} } ...
Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects. JSON, Jackson, Gson, JAX-RS integrations included javabuildergsonguavaannotation-processorjacksonimmutablesimmutable-objectsimmutable-datastructuresimmutable-collections ...