[英]Verifying the calling of a non-static method of a private static nested class of a static outer class
[英]calling method from private static nested class
我有一个不太好的旧代码,涉及使用私有静态类的方法,我想知道是否可以调用此类中的方法。 我正在为此编写测试。 我知道,如果这是一种方法,则可以通过反射来完成,但事实并非如此。
public class FiscalReport implements Report
{
private void readProductValueClass()
{
Connection dbc = null;
Statement st = null;
ResultSet rs = null;
String q = null;
try
{
dbc = db.getConnection();
dbc.setAutoCommit(false);
st = dbc.createStatement();
routerClassMap = new HashMap();
q = "SELECT * FROM sales_report";
rs = st.executeQuery(q);
while(rs.next())
{
ProductValueClassrc = new ProductValueClass(); // <---this new class
// is where it gets called...
.....
}
private static class ProductValueClass
{
public String name;
public String emp;
public String sale;
public String option;
public String value;
public Query q;
public Query qr
public Query sql;
public String toString()
{
return
"[" +
name + ", " +
emp + ", " +
sale + ", " +
option + ", " +
values +
"]";
}
public Query query()
{
return q.add(q(notEqual(qr)? null: sql));
}
}
}
我相信您正在寻找创建私有内部类的实例吗? 如果是这种情况,此链接已经为您提供了一个解决方案: 使用Java反射实例化私有内部类
您可以像这样访问ProductValueClass的方法:
try {
//creating parent object
Object parent=new FiscalReport();
//creating inner class object
Class<?> innerClass=Class.forName("FiscalReport$ProductValueClass");
//inner object must know type of outer class
Constructor<?> constructor=innerClass.getDeclaredConstructor(FiscalReport.class);
//private inner class has private default constructor
constructor.setAccessible(true);
//inner object must know about its outer object
Object child = constructor.newInstance(parent);
//invoking method on inner class object
Method method = innerClass.getDeclaredMethod("wantedMethod",new Class<?>[]{});
method.setAccessible(true);//in case of unaccessible method
method.invoke(child,new Object[]{});
} catch (ClassNotFoundException | NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
由于您的内部类是静态的,请尝试以下操作:
Class<?> clazz = Class.forName("FiscalReport$ProductValueClass");
Object c = clazz.newInstance();
Class<?> productValueClass = c.getClass();
Method toStringMethod = productValueClass.getMethod("toString", new Class<?>[] {});
toStringMethod.setAccessible(true);
System.out.println(toStringMethod.invoke(c));
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