从另一个视觉设计切换到视觉设计 [英] Switch to a Visual Design from another Visual Design

问题描述

我正在用Java工作.我创建了两个视觉设计，First.java和Second.java，它们都包含表单可显示内容.

I'm working in java me. I created two visual designs, First.java and Second.java both of which contains form displayables.

我在First.Java中的表单中添加了一个Ok命令，希望用户在Second.java中切换到SecondForm，但是出现此错误non-static method getSecondForm() cannot be referenced from a static context.

I added an Ok command to a form in First.Java and the user is expected to switch to SecondForm in Second.java but I get this error non-static method getSecondForm() cannot be referenced from a static context.

我该如何解决?

两个文件都在同一个程序包中.这是源代码

Both files are in the same package. Here's the source code

 public void commandAction (Command command, Displayable displayable) {

    if (displayable == firstForm) {

        if (command == exitCommand) {
            exitMIDlet();

        } else if (command == okCommand) {

            switchDisplayable(null, Second.getSecondForm());
        }
    }
 }

推荐答案

您需要在Second.java中更改方法getSecondForm的声明以使其静态.

You need to change declaration of the method getSecondForm in Second.java to make it static.

如果当前看起来像

Displayable getSecondForm() //... whatever code is there

然后在更改后它应该看起来像

then after change it should look like

static Displayable getSecondForm() //... whatever code is there

请注意，上述更改将解决您提到的non-static method getSecondForm...错误，但有可能会导致文件Second.java中出现新的编译错误.您将需要修复这些新错误，最有可能的是在此处和此处添加几个static关键字，类似于上面的显示方式.

Note above change will fix the non-static method getSecondForm... error you mentioned but there is a chance that it will cause new compilation errors in file Second.java. You will need to fix these new errors, most likely by adding couple static keywords here and there, similar to how it is shown above.

_{请注意，这是java 语言基本的东西；如果您无法解决此问题，请考虑休息一下，为初学者学习一些教程.}

_{Note this is java language basic stuff; if you get stuck fixing this, consider taking a break to study some tutorial for beginners.}

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