调用多线程的start方法时报错：start未定义 The method start() is undefined for the type SpeakElephant...

最新推荐文章于 2024-02-16 21:51:29 发布
转载 最新推荐文章于 2024-02-16 21:51:29 发布 · 761 阅读 · 1 ·
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原文链接：http://www.cnblogs.com/Tristan-Adams/p/9996428.html
文章标签：

#java

本文探讨了在Java中创建多线程时遇到的问题：由于主类和线程类命名相同导致的start方法未定义错误。详细分析了命名冲突的原因，并提出了避免此类问题的建议，强调了类命名的重要性。

1.问题：调用多线程的start方法时报错：start未定义
原因：主类的名字Thread和线程名Thread冲突，导致无法识别对多线程Thread方法的继承，故无法调用线程Thread的方法start()
亦即public class Thread 的类名和后面public class SpeakCar extends Thread中的线程方法名Thread冲突；
反思：下次给每个类起名时既要保证不和Java关键字重名，又要保证不能和用到的继承对象或调用对象重名

转载于:https://www.cnblogs.com/Tristan-Adams/p/9996428.html

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Consider exposing JMeter plugins via META-INF/services, and add JMeter-Skip-Class-Scanning=true manifest attribute so JMeter can skip classfile scanning 2025-09-25 13:11:33,070 INFO o.a.j.r.ClassFinder: Will scan jar D:\验收\apache-jmeter-5.6.2\lib\ext\jmeter-plugins-manager-1.10.jar with filter ExtendsClassFilter [parents=[interface org.apache.jmeter.functions.Function], inner=false, contains=null, notContains=null]. Consider exposing JMeter plugins via META-INF/services, and add JMeter-Skip-Class-Scanning=true manifest attribute so JMeter can skip classfile scanning 2025-09-25 13:11:33,072 INFO o.a.j.r.ClassFinder: Will scan jar D:\验收\apache-jmeter-5.6.2\lib\ext\jmeter-plugins-random-csv-data-set-0.8.jar with filter ExtendsClassFilter [parents=[interface org.apache.jmeter.functions.Function], inner=false, contains=null, notContains=null]. Consider exposing JMeter plugins via META-INF/services, and add JMeter-Skip-Class-Scanning=true manifest attribute so JMeter can skip classfile scanning 2025-09-25 13:11:33,073 INFO o.a.j.r.ClassFinder: Will scan jar D:\验收\apache-jmeter-5.6.2\lib\ext\CMAEnDeUtil-1.0-SNAPSHOT.jar with filter ExtendsClassFilter [parents=[interface org.apache.jmeter.functions.Function], inner=false, contains=null, notContains=null]. Consider exposing JMeter plugins via META-INF/services, and add JMeter-Skip-Class-Scanning=true manifest attribute so JMeter can skip classfile scanning 2025-09-25 13:11:33,074 INFO o.a.j.r.ClassFinder: Will scan jar D:\验收\apache-jmeter-5.6.2\lib\ext\jmeter-plugins-casutg-3.1.1.jar with filter ExtendsClassFilter [parents=[interface org.apache.jmeter.functions.Function], inner=false, contains=null, notContains=null]. Consider exposing JMeter plugins via META-INF/services, and add JMeter-Skip-Class-Scanning=true manifest attribute so JMeter can skip classfile scanning 2025-09-25 13:11:33,079 INFO o.a.j.t.TestPlan: added D:\验收\apache-jmeter-5.6.2\lib\ext\jmeter-custom-lib-1.0.0.jar to classpath 2025-09-25 13:11:33,082 INFO o.a.j.g.u.JMeterMenuBar: setRunning(true, *local*) 2025-09-25 13:11:33,083 INFO o.a.j.e.StandardJMeterEngine: Starting setUp thread groups 2025-09-25 13:11:33,083 INFO o.a.j.e.StandardJMeterEngine: Starting setUp ThreadGroup: 1 : setUp Thread Group 2025-09-25 13:11:33,083 INFO o.a.j.e.StandardJMeterEngine: Starting 1 threads for group setUp Thread Group. 2025-09-25 13:11:33,083 INFO o.a.j.e.StandardJMeterEngine: Thread will continue on error 2025-09-25 13:11:33,083 INFO o.a.j.t.ThreadGroup: Starting thread group... number=1 threads=1 ramp-up=1 delayedStart=false 2025-09-25 13:11:33,094 INFO o.a.j.t.ThreadGroup: Started thread group number 1 2025-09-25 13:11:33,095 INFO o.a.j.e.StandardJMeterEngine: Waiting for all setup thread groups to exit 2025-09-25 13:11:33,099 INFO o.a.j.t.JMeterThread: Thread started: setUp Thread Group 1-1 2025-09-25 13:11:33,100 INFO o.a.j.s.FileServer: Stored: D:/验收/测试执行/项目材料/2025/9月/应急救援/csv/custmer.csv 2025-09-25 13:11:33,126 ERROR o.a.j.u.BeanShellInterpreter: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,127 WARN o.a.j.m.BeanShellPreProcessor: Problem in BeanShell script. org.apache.jorphan.util.JMeterException: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,133 INFO o.a.j.p.h.s.HTTPHCAbstractImpl: Local host = LAPTOP-5AL5IVVO 2025-09-25 13:11:33,136 INFO o.a.j.p.h.s.HTTPHC4Impl: HTTP request retry count = 0 2025-09-25 13:11:33,291 INFO o.a.j.p.h.s.h.LazyLayeredConnectionSocketFactory: Setting up HTTPS TrustAll Socket Factory 2025-09-25 13:11:33,292 INFO o.a.j.u.JsseSSLManager: Using default SSL protocol: TLS 2025-09-25 13:11:33,292 INFO o.a.j.u.JsseSSLManager: SSL session context: per-thread 2025-09-25 13:11:33,300 INFO o.a.j.u.SSLManager: JmeterKeyStore Location: type JKS 2025-09-25 13:11:33,301 INFO o.a.j.u.SSLManager: KeyStore created OK 2025-09-25 13:11:33,301 WARN o.a.j.u.SSLManager: Keystore file not found, loading empty keystore 2025-09-25 13:11:33,426 ERROR o.a.j.u.BeanShellInterpreter: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,426 WARN o.a.j.m.BeanShellPreProcessor: Problem in BeanShell script. org.apache.jorphan.util.JMeterException: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,526 ERROR o.a.j.u.BeanShellInterpreter: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,526 WARN o.a.j.m.BeanShellPreProcessor: Problem in BeanShell script. org.apache.jorphan.util.JMeterException: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import com.ye.Sm2Util; import org.apache.commons.codec.digest.DigestUtils; impor . . . '' : Attempt to resolve method: prepareLoginData() on undefined variable or class name: LoginRequest 2025-09-25 13:11:33,700 INFO o.a.j.t.JMeterThread: Thread is done: setUp Thread Group 1-1 2025-09-25 13:11:33,700 INFO o.a.j.t.JMeterThread: Thread finished: setUp Thread Group 1-1 2025-09-25 13:11:33,701 INFO o.a.j.e.StandardJMeterEngine: All Setup Threads have ended 2025-09-25 13:11:33,808 INFO o.a.j.e.StandardJMeterEngine: No enabled thread groups found 2025-09-25 13:11:33,808 INFO o.a.j.e.StandardJMeterEngine: Notifying test listeners of end of test 2025-09-25 13:11:33,808 INFO o.a.j.s.FileServer: Close: D:/验收/测试执行/项目材料/2025/9月/应急救援/csv/custmer.csv 2025-09-25 13:11:33,814 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, *local*)
最新发布
09-26
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qq 117791303
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报错 the method isEmpty is undefined for the type java.lang.String
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<think>嗯，用户现在遇到了另一个Java编译错误：“the method isEmpty() is undefined for the type java.lang.String”。这个错误看起来和之前的问题不同，但可能同样涉及版本或语法的问题。我需要先确定isEmpty()方法在Java中的版本支持情况。 首先，我记得isEmpty()是String类的一个方法，用于检查字符串是否为空。这个方法是在Java 6中被引入的。如果用户的JDK版本低于1.6，那么确实无法使用这个方法，因为旧版本中没有这个方法的定义。这时候，用户需要升级JDK或者改用其他方式，比如检查字符串长度是否为0。 接下来，用户可能误用了方法名。比如，是否拼写错误，比如写成了isEmptyy()或者其他形式。或者是否在调用的时候没有正确使用括号，比如isEmpty而不是isEmpty()，但这种情况应该会导致不同的错误提示，比如方法未找到，但错误信息明确指出是isEmpty未定义，所以更可能的是版本问题或者作用对象错误。 另外，用户可能在非String类型的对象上调用了isEmpty()，比如可能将其他类型的对象强制转型为String，但实际上并不是String类型。例如，如果变量被声明为Object类型，即使实际是String，也需要显式转型才能调用String的方法，否则编译器会报错。 还有一种可能性是用户的代码中导入了错误的String类，比如自定义的String类，导致编译器找不到正确的方法。不过这种情况比较少见，但需要确认用户的类路径和导入语句是否正确。 总结起来，可能的原因包括： 1. JDK版本过低，不支持isEmpty()方法。 2. 方法名拼写错误。 3. 在非String类型的对象上调用isEmpty()。 4. 导入了错误的String类。 用户需要检查他们的JDK版本，确保至少是1.6或更高。然后检查代码中的方法拼写和调用对象类型是否正确。如果JDK版本无法升级，建议改用length() == 0的方式替代isEmpty()。 此外，用户可能是在处理其他库或框架中的字符串对象，比如某些库可能返回自定义的字符串类型，这时候也需要确认对象的实际类型。 最后，确保没有使用任何覆盖或隐藏String类的方法的自定义类，这可能导致编译器找不到正确的方法定义。</think>你在使用 Java 时遇到的错误 `the method isEmpty() is undefined for the type java.lang.String`，通常是因为 **JDK 版本过低** 或 **方法调用对象类型不匹配** 导致的。以下是详细解释和解决方法： --- ### **问题原因** 1. **JDK 版本过低** `String.isEmpty()` 方法是 **Java 6（JDK 1.6）** 引入的。如果你的项目使用的是 JDK 1.5 或更低版本，`isEmpty()` 方法在 `String` 类中不存在，因此会报错。 2. **方法名拼写错误** 例如将 `isEmpty()` 错误拼写为 `isempty()`、`isEmptyy()` 等（Java 区分大小写）。 3. **对象类型非 String** 如果你尝试在非 `String` 类型的对象（如 `Object`、`CharSequence` 或自定义类）上调用 `isEmpty()`，而该类型未定义此方法，也会报错。 --- ### **解决方法** #### 1. 检查并升级 JDK 版本 - **验证当前 JDK 版本**： 在命令行输入 `java -version`，确认版本是否低于 1.6。 - 如果版本过低，需升级到 **JDK 1.6 或更高**。 - 在 IntelliJ IDEA 中修改项目 JDK： `File > Project Structure > Project SDK` → 选择更高版本（如 JDK 8/11/17）。 - **兼容性处理**： 如果无法升级 JDK，改用 `length() == 0` 替代 `isEmpty()`： ```java String str = "test"; boolean isEmpty = str.length() == 0; // 兼容 JDK 1.5 及以下 ``` #### 2. 检查方法名拼写 确保方法名完全匹配 `isEmpty()`： ```java String str = "hello"; boolean isEmpty = str.isEmpty(); // 正确 // boolean isEmpty = str.isempty(); // 错误（大小写敏感） ``` #### 3. 确保对象类型为 String - **避免类型混淆**： 如果变量声明为 `Object` 或父类类型（如 `CharSequence`），需强制转型为 `String` 后再调用： ```java Object obj = "test"; boolean isEmpty = ((String) obj).isEmpty(); // 强制转型为 String ``` - **检查泛型或集合类型**： 例如，从 `List<String>` 获取元素时，确保实际类型是 `String`： ```java List<String> list = new ArrayList<>(); String element = list.get(0); boolean isEmpty = element.isEmpty(); ``` #### 4. 检查依赖冲突（罕见情况） 如果项目中引入了自定义的 `String` 类或第三方库覆盖了 JDK 的 `String` 类，可能导致方法缺失。需检查依赖关系，移除冲突的库。 --- ### **示例代码** ```java public class Main { public static void main(String[] args) { String str1 = ""; String str2 = "hello"; // 正确用法（JDK 1.6+） System.out.println(str1.isEmpty()); // 输出 true System.out.println(str2.isEmpty()); // 输出 false // 兼容低版本 JDK 的写法 System.out.println(str1.length() == 0); // 输出 true } } ``` --- ### **总结** | 问题场景 | 解决方法 | |---------------------------|------------------------------------------| | JDK 版本 < 1.6 | 升级 JDK 或改用 `str.length() == 0` | | 方法名拼写错误 | 修正为 `isEmpty()` | | 对象类型非 String | 强制转型为 `String` 或修正变量声明类型 | | 依赖冲突 | 检查并修复类路径或依赖配置 | 如果问题仍未解决，请检查： - 项目是否错误地覆盖了 `java.lang.String` 类。 - IDE 是否缓存了旧版本代码（尝试 `Build > Clean Project`）。
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