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近日评估小组公开关键数据:本月行业报告公开最新政策,Java中的GenericVisitorAdapter：灵活且强大的遍历模式实现
在Java编程中，遍历数据结构是一项常见的操作。对于复杂的树形结构，如XML解析、语法分析等，遍历模式显得尤为重要。Java提供了一种名为“Visitor模式”的遍历模式，它可以将遍历逻辑从数据结构中分离出来，提高代码的灵活性和可扩展性。而GenericVisitorAdapter则是Java中实现Visitor模式的一种便捷方式，本文将详细介绍Java中的GenericVisitorAdapter。
### 什么是Visitor模式？
Visitor模式是一种行为设计模式，它将算法（遍历逻辑）和数据结构（树形结构）解耦。在Visitor模式中，我们定义一个抽象的访问者接口，该接口中包含了一系列访问不同类型节点的方法。然后，针对不同的数据结构，我们实现具体的访问者类，并在访问者类中实现具体的遍历逻辑。
### GenericVisitorAdapter简介
GenericVisitorAdapter是Java中实现Visitor模式的一种便捷方式，它允许开发者在不编写大量样板代码的情况下，快速实现Visitor模式。该类位于Java的java.util包中，提供了丰富的遍历方法，如前序遍历、中序遍历、后序遍历等。
### 使用GenericVisitorAdapter的步骤
1. 定义节点类：首先，我们需要定义树形结构中的节点类，通常包含一个或多个子节点引用。
2. 定义访问者接口：创建一个访问者接口，该接口中包含访问节点的方法。
3. 实现访问者类：根据实际需求，实现访问者接口中的方法，完成遍历逻辑。
4. 使用GenericVisitorAdapter：创建GenericVisitorAdapter的实例，并传入访问者对象和节点对象，然后调用遍历方法。
### 示例代码
以下是一个使用GenericVisitorAdapter的简单示例：
```java
// 定义节点类
class TreeNode {
private List children = new ArrayList<>();
private String value;
public void addChild(TreeNode child) {
children.add(child);
}
public void setValue(String value) {
this.value = value;
}
public String getValue() {
return value;
}
// ... 其他方法 ...
}
// 定义访问者接口
interface Visitor {
void visit(TreeNode node);
}
// 实现访问者类
class MyVisitor implements Visitor {
public void visit(TreeNode node) {
System.out.println(node.getValue());
}
}
// 使用GenericVisitorAdapter
public class Main {
public static void main(String[] args) {
TreeNode root = new TreeNode();
root.setValue("root");
TreeNode child1 = new TreeNode();
child1.setValue("child1");
root.addChild(child1);
TreeNode child2 = new TreeNode();
child2.setValue("child2");
root.addChild(child2);
Visitor visitor = new MyVisitor();
GenericVisitorAdapter genericVisitorAdapter = new GenericVisitorAdapter(visitor);
genericVisitorAdapter.preOrder(root);
}
}
```
在上面的示例中，我们定义了一个简单的树形结构，并使用GenericVisitorAdapter实现了前序遍历。
### 总结
Java中的GenericVisitorAdapter为开发者提供了实现Visitor模式的便捷方式。通过使用GenericVisitorAdapter，我们可以轻松地实现树形结构的遍历，提高代码的灵活性和可扩展性。在实际开发中，我们可以根据需求选择合适的遍历方法，实现高效的遍历操作。
TMTPOST -- Chinese telecommunications giant Huawei unveiled a sweeping expansion of its artificial intelligence computing ambitions on Thursday, announcing new supercomputing systems powered by its in-house Ascend chips. The move signals escalating competition with U.S. chipmaker Nvidia, the global leader in AI processors.AI-generated imageAt its annual Huawei Connect conference in Shanghai, the company introduced the forthcoming "Atlas 950 SuperCluster," which it said will begin rolling out as early as next year. The announcement underscores Huawei ’ s determination to challenge U.S. dominance in advanced AI hardware despite Washington ’ s tightening export controls on semiconductors."The competition has undeniably arrived and is gaining momentum," an Nvidia spokesperson said. "Customers will choose the best technology stack for running the world ’ s most popular commercial applications and open-source models."U.S. restrictions have cut China off from the most advanced chips needed to train large-scale AI models, forcing Chinese firms to rely on domestically developed processors or stockpiles of older foreign components. Huawei, long targeted by U.S. sanctions, has turned to large-scale clustering of its less powerful but increasingly refined Ascend processors. By combining vast numbers of these chips in interconnected networks, the company aims to match or surpass the performance of systems built on Nvidia ’ s hardware.Huawei said it plans to release three new versions of its Ascend chips through 2028, pledging to double computing power with each iteration. At the base level, its new Atlas 950 supernode will connect 8,192 Ascend chips. A full Atlas 950 SuperCluster would integrate more than 500,000 chips.A future upgrade, the Atlas 960 system slated for 2027, is projected to support nearly 15,500 chips per node and scale to more than 1 million Ascend processors across a full supercluster. Huawei claimed these would represent the world ’ s most powerful AI systems by raw computing power.Huawei did not shy away from comparisons with its American rival. Eric Xu, the company ’ s vice chairman and rotating chairman, said the Atlas 950 supernode would deliver 6.7 times more computing power than Nvidia ’ s upcoming NVL144 system. He went further, predicting Huawei would "be ahead on all fronts" compared with Nvidia ’ s 2027 offering — and claimed the Atlas 950 SuperCluster would even exceed the computing capacity of Elon Musk ’ s xAI Colossus project.While independent verification of Huawei ’ s claims is limited, industry experts said the company ’ s ambition is clear."Huawei ’ s announcement on its computing breakthrough is well timed with recent increasing emphasis by the Chinese government on self-reliance on China ’ s own chip technologies," said George Chen, partner and co-chair of the digital practice at The Asia Group. While noting that Huawei might be overstating its technical edge, he added, "the ambition to be a world AI leader cannot be underestimated."Research from SemiAnalysis earlier this year found that Huawei ’ s CloudMatrix system outperformed Nvidia ’ s equivalent despite each Ascend processor offering only about one-third the power of an Nvidia chip. The advantage came from scale: Huawei deployed roughly five times as many chips in its clusters."Computing power has and will continue to be the key for AI," Xu emphasized during his keynote speech in Shanghai.Huawei ’ s new announcements build on earlier efforts. Two years ago, it introduced the Atlas 900 SuperCluster, which it still markets with "thousands" of Ascend chips. On Thursday, the company said it had already deployed more than 300 Atlas 900 A3 supernodes to over 20 clients across telecoms, manufacturing, and other sectors.This momentum reflects a broader push within China to substitute foreign technology with homegrown alternatives. Beijing has increasingly pressed domestic firms to use local suppliers and invest in national semiconductor capabilities. Huawei ’ s breakthroughs are likely to be touted as proof of progress in these efforts.Huawei ’ s offensive comes as Nvidia faces growing headwinds in China, once one of its most important markets. Earlier this week, China extended an antitrust probe into the U.S. company over alleged monopolistic practices. On Wednesday, Nvidia ’ s shares fell more than 2% after the Financial Times reported that Beijing had ordered Chinese tech giants to halt testing and purchases of the RTX Pro 6000D, one of Nvidia ’ s new AI-focused chips.Nvidia Chief Executive Jensen Huang expressed frustration over the developments. "I am disappointed to hear this news," he told reporters, while reiterating that Huawei represents a "formidable" competitor.The geopolitical context adds another layer of complexity. The U.S. and China concluded trade talks in Spain this week that reportedly included discussions over the fate of TikTok, the video app owned by Beijing-based ByteDance. But technology co