如何注入方法的返回值？

发布于 2024-12-18 06:57:18 字数 1228 浏览 2 评论 0原文

我什至不确定这是否可能，但由于这个问题，我提出了这个想法：使用 Java 反射更改私有静态最终字段

所以这是场景：

public static String test() {
  return "test test test";
}

我想要做的就是让 test() 方法返回“worked”而不是“test test test”。有谁知道如何实现这一点？

编辑：
我下载了 powermock 并尝试了这个：

package test;

导入 org.powermock.api.easymock.PowerMock;

公共类 InjectorTest {

public static void main(final String[] args) {
    System.out.println("Before the injection:");
    System.out.println(test());

    PowerMock.mockStatic(InjectorTest.class);
    PowerMock.doReturn("worked").when(InjectorTest.class, "test");

    System.out.println("After the injection:");
    System.out.println(test());
}

public static String test() {
    return "did not work :(";
}


 }

但是 Eclipse 给出了这个错误： The method doReturn(String) is undefined for the type PowerMock
我是否下载了错误的代码，或者是一个错误的示例代码？

因为我不想获得更多投票，为什么我要这样做？
我想以不使用 user.home 而是相对 URI 的方式注入 Minecraft。
通过这种方式，我可以为学校制作一个预装的便携式 Minecraft（我的世界），用于 U 盘：D

原文

I am not even sure if this is possible, but I came up with this idea because of this question: Change private static final field using Java reflection

So this is the scenario:

public static String test() {
  return "test test test";
}

What I want to do this let the test() method return "worked" instead of "test test test".
Does anybody have an idea how to accomplish this?

EDIT:
I downloaded powermock and tried this:

package test;

import org.powermock.api.easymock.PowerMock;

public class InjectorTest {

public static void main(final String[] args) {
    System.out.println("Before the injection:");
    System.out.println(test());

    PowerMock.mockStatic(InjectorTest.class);
    PowerMock.doReturn("worked").when(InjectorTest.class, "test");

    System.out.println("After the injection:");
    System.out.println(test());
}

public static String test() {
    return "did not work :(";
}

}
But eclipse gives this error: The method doReturn(String) is undefined for the type PowerMock

Did I download the wrong one or was that a bad sample code?
Because I don't want more votedowns, WHY I want to do this?

I want to inject Minecraft in that way that it doesn't uses the user.home but a relative URI.

In this way I can make a pre-installed portable Minecraft for an USB stick for school :D

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溇涏 2024-12-25 06:57:18

我认为 PowerMock 可以做到这一点。（Java 反射在幕后）

使用 PowerMock，您的代码将如下所示：

public static void main(String[] args) {
    PowerMock.mockStatic(Foo.class); 
    PowerMock.doReturn("worked").when(Foo.class, "test");
    System.out.println(Foo.test());
}

上面的代码归功于 @RC

I think PowerMock can do this. (Java reflection under the hood)

With PowerMock, your code would look like this:

public static void main(String[] args) {
    PowerMock.mockStatic(Foo.class); 
    PowerMock.doReturn("worked").when(Foo.class, "test");
    System.out.println(Foo.test());
}

Credits to @RC for code above

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