Question

我正在编写一个java模板来测试我的类的方法。要测试的类具有私有构造函数和静态方法：

public class ProdClass {
  private ProdClass() {
  }

  public static EnumType myMethod() {
    // do something
  }
}

在我的测试模板类中，我使用java反射编写此代码：

String className = "com.myproject.mypackage.ProdClass";
String testMethodName = "myMethod";
Object[] obj = {};

... OTHER CODE FOR RENDERING ...

Class<?> params[] = new Class[obj.length];
for (int i = 0; i < obj.length; i++) {
    if (obj[i] instanceof Integer) {
        params[i] = Integer.TYPE;
    } else if (obj[i] instanceof String) {
        params[i] = String.class;
    } else if (obj[i] instanceof EnumType) {
        params[i] = EnumType.class;
    }
}

Class<?> cls = null;
Method testMethod = null;

try {
    cls = Class.forName(className);
    testMethod = cls.getDeclaredMethod(testMethodName, params);
} catch (NoSuchMethodException e1) {
     e1.printStackTrace();
 } catch (SecurityException e1) {
    e1.printStackTrace();
 } catch (ClassNotFoundException e1) {
     e1.printStackTrace();
}

Object resultTest = null;
try {
        resultTest = testMethod.invoke(cls.newInstance(),obj);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | InstantiationException e) {
    e.printStackTrace();
}

if (resultTest != null) {
    System.out.println(" Result: " + resultTest.toString());
}

但是我收到以下错误：

java.lang.IllegalAccessException: Class com.myproject.testpackage.TestTemplate$1$1 can not access a member of class com.myproject.mypackage.ProdClass with modifiers "private"
at sun.reflect.Reflection.ensureMemberAccess(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.myproject.testpackage.TestTemplate$1$1.run(TestTemplate.java:264)
at java.lang.Thread.run(Unknown Source)

因为我有一个私人构造函数。有人会知道如何在不成为公共构造函数的情况下解决问题。

非常感谢。

Answer 1

尝试替换

        resultTest = testMethod.invoke(cls.newInstance(),obj);

与

        Constructor constructor = constructor.getConstructor();
        constructor.setAccessible(true);
        resultTest = testMethod.invoke(constructor.newInstance(),obj);

Answer 2

尝试：

Constructor constructor = cls.getConstructor();
constructor.setAccessible(true);
constructor.newInstance();

Java反射 - 调用具有私有构造函数的泛型类的静态方法

2 个答案: