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Java

Name: Java
Author: ivangdavila

作者 Iván · GitHub ↗ · v1.0.1

linuxdarwinwin32 ✓ 安全检测通过

2452

总下载

当前安装

版本数

在 OpenClaw 中安装

/install java

功能描述

Write robust Java avoiding null traps, equality bugs, and concurrency pitfalls.

使用说明 (SKILL.md)

Quick Reference

Topic	File
Nulls, Optional, autoboxing	`nulls.md`
Collections and iteration traps	`collections.md`
Generics and type erasure	`generics.md`
Concurrency and synchronization	`concurrency.md`
Classes, inheritance, memory	`classes.md`
Streams and CompletableFuture	`streams.md`
Testing (JUnit, Mockito)	`testing.md`
JVM, GC, modules	`jvm.md`

Critical Rules

== compares references, not content — always use .equals() for strings
Override equals() must also override hashCode() — HashMap/HashSet break otherwise
Optional.get() throws if empty — use orElse(), orElseGet(), or ifPresent()
Modifying while iterating throws ConcurrentModificationException — use Iterator.remove()
Type erasure: generic type info gone at runtime — can't do new T() or instanceof List\x3CString>
volatile ensures visibility, not atomicity — count++ still needs synchronization
Unboxing null throws NPE — Integer i = null; int x = i; crashes
Integer == Integer uses reference for values outside -128 to 127 — use .equals()
Try-with-resources auto-closes — implement AutoCloseable, Java 7+
Inner classes hold reference to outer — use static nested class if not needed
Streams are single-use — can't reuse after terminal operation
thenApply vs thenCompose — compose for chaining CompletableFutures
Records are implicitly final — can't extend, components are final
serialVersionUID mismatch breaks deserialization — always declare explicitly

安全使用建议

This skill is a read-only collection of Java best-practice notes and appears low-risk. Before installing, verify you trust the skill source if that matters for governance; ensure your agent environment has legitimate java/javac binaries if the platform will validate those. Because the skill is allowed to be invoked autonomously by default, be aware an agent could use the guidance to write or suggest code during automated runs — but the skill itself does not request credentials, perform network calls, or install software.

功能分析

Type: OpenClaw Skill Name: java Version: 1.0.1 The skill bundle is benign. It consists entirely of documentation and best practices for Java programming, spread across several markdown files. The `SKILL.md` file, which serves as instructions for the AI agent, is purely informational and educational, providing a quick reference and critical rules for Java. It correctly declares `java` and `javac` as required binaries, which is appropriate for a Java-focused skill. There is no evidence of prompt injection attempts, malicious execution, data exfiltration, persistence mechanisms, or obfuscation across any of the files.

能力评估

✓ Purpose & Capability

Name/description match the content: Java guidance on nulls, equality, concurrency, etc. Declared binary requirements (java, javac) are reasonable and proportional for a Java-focused skill (they are only required/checked, not used to access unrelated services). No unrelated environment variables or credentials are requested.

✓ Instruction Scope

SKILL.md and the included markdown files are purely documentation and coding guidance. They do not instruct the agent to read system files, access credentials, call external endpoints, or perform actions outside producing or validating Java code.

✓ Install Mechanism

No install spec (instruction-only). Nothing is downloaded or written to disk by the skill package itself, minimizing install-time risk.

✓ Credentials

The skill requires no environment variables or credentials. The lack of secrets or config-path requirements is proportional to a documentation/reference skill.

✓ Persistence & Privilege

Skill is not marked always:true and does not request persistent system changes. It is user-invocable and can be invoked autonomously per platform defaults—appropriate for a reference skill. There is no evidence it modifies other skills or system-wide settings.

如何使用

确保已安装 OpenClaw（本地或 Docker 部署）
在对话框中输入安装命令：/install java
安装完成后，直接呼叫该 Skill 的名称或使用 /java 触发
根据 Skill 的参数说明提供必要输入，即可获得结构化输出

版本历史

v1.0.1

Initial release

v1.0.0

Initial release

元数据

Slug java

版本 1.0.1

许可证 —

累计安装 15

当前安装数 15

历史版本数 2

常见问题

Java 是什么？

Write robust Java avoiding null traps, equality bugs, and concurrency pitfalls. 它是一个面向 Claude Code / OpenClaw 的 AI Agent Skill 插件，目前累计下载 2452 次。

如何安装 Java？

在 OpenClaw 或 Claude Code 对话框中运行命令「/install java」即可一键安装，无需额外配置。

Java 是免费的吗？

是的，Java 完全免费（开源免费），可自由下载、安装和使用。

Java 支持哪些平台？

Java 跨平台运行，可在任意部署了 OpenClaw / Claude Code 的环境中使用（linux, darwin, win32）。

谁开发了 Java？

由 Iván（@ivangdavila）开发并维护，当前版本 v1.0.1。