我正在使用 Android Studio 1.4.1,我刚刚创建了一个 Hashmap,并且正在学习如何填充和操作它的教程(关于 java).但是,我收到无法解析符号放置"错误,并且放置"命令为红色.我添加的图像显示了自动完成快照,尽管导入了 java.util.HashMap,但自动完成中没有可用的put"命令.可用的命令也以红色显示.我尝试使用它们而不是put"命令.我一直有这种类型的问题.任何人都可以帮忙吗?提前谢谢你...
I am working with Android Studio 1.4.1 and I had just created a Hashmap and was following a tutorial (on java) on how to populate and manipulate it. However I get a 'cannot resolve symbol put' error and the "put" command is in red. The image I added shows the auto complete snapshot and although java.util.HashMap is imported there is no "put" command that is available in autocomplete. The available commands also are showing in red. I tried to use them instead of the "put" command. I keep having this type of problem all along. Can anyone help? Thank you in advance...
import java.util.HashMap;
HashMap<String, String> pozisyon = new HashMap<String, String>();
pozisyon.put("SKale", "a8");
您不能在方法之外的 HashMap 字段中添加元素.这样的事情是行不通的:
You cannot add elements in HashMap fields outside of methods. Things like this wont work:
public class Class {
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("one", "two");
}
如果你想实现它,把它放在构造函数中,像这样:
If you want to achieve that, put it in the constructors, like so:
public class Class {
HashMap<String, String> hashMap = new HashMap<String, String>();
public Class() {
hashMap.put("one", "two");
}
}
您可以使用 static
块来执行此操作.
Other way you can do it is in a static
block.
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