英文:
Java Eclipse LocalDate cannot be resolved to a type?
问题
以下是翻译好的代码部分：
package com.journaldev.java8.time;
import java.time.LocalDate;
import java.time.Month;
import java.time.ZoneId;
public class calendartest {
public static void main(String[] args) {
// 当前日期
LocalDate today = LocalDate.now();
System.out.println("当前日期=" + today);
}
}
你确定你的 Java 版本是8，因为我通过命令行检查了一下，这是结果：
但不幸的是，当我运行我的代码时，结果是：
Exception in thread "main" java.lang.Error: 无法解析的编译问题：
LocalDate 无法解析为一种类型
LocalDate 无法解析
你能否给我一些建议？非常感谢！
英文:
I am working with Java and trying to write a very simple test code like this to test LocalDate
package com.journaldev.java8.time;
import java.time.LocalDate;
import java.time.Month;
import java.time.ZoneId;
public class calendartest {
public static void main(String[] args) {
// Current Date
LocalDate today = LocalDate.now();
System.out.println("Current Date=" + today);
}
}
I am sure that my java version is 8 because I checked by cmd and here is the result
But unfortunately, when I ran my code, the result is
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
LocalDate cannot be resolved to a type
LocalDate cannot be resolved
Could you please give me some comments ? Thank you very much!
答案1
得分: 1
我无法在您上传的图像上看到那个，但请确保源代码文件放在src/default包下。不应放在项目的根目录下。
要更改项目的Java版本，您可以按照此链接上的说明进行操作：https://www.baeldung.com/eclipse-change-java-version。
顺便说一下，我看到您已经选中了**“使用默认编译设置”**复选框，这就是您的更改未生效的原因。取消该选项，然后再试一次。
英文:
I can't see that on the image you uploaded, but be sure that source code file goes under src/default package. It should not be in the project's root directory.
To change the Java Version of project you can follow instructions given on this link : https://www.baeldung.com/eclipse-change-java-version.
By the way, I see that you checked "Use default compilance setting" checkbox, that is why your change is not applied. Uncheck that option and try again.
答案2
得分: 1
谢谢大家的评论。在经过4个小时后，我对自己的问题有了答案。最终我发现，我使用的是 Eclipse Helios 2010，所以我无法从 Jdk 1.7 升级到 Jdk 1.8。当我将 Eclipse Helios 更改为 Eclipse Luna 时，我所有的问题都解决了。顺便说一句，感谢大家的评论，祝你们一切顺利。
英文:
Thanks all for your comments. Here is my answer for my problem after 4 hours, finally I found that, I used Eclipse Helios 2010, so that I can not upgrade from Jdk 1.7 to Jdk 1.8. When I changed FROM Eclipse Helios to Eclipse Luna, ALL my problems have been gone. By the way thanks for your comments and wish you all the best.
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