Question

我正在尝试重用作用于一个类对象上的代码部分，我有多个类，这些类大多数具有90％相同的方法名，现在我有一堆if else语句，其中第一行是唯一，其余的都一样，有没有办法让我传递对象并使用其方法？

ive尝试仅将重复的代码放入活动中的方法中，但是无论我如何重新初始化对象，方法名称都永远不会被识别例如，我将创建一个名为lookupclass（Object lookupObject）的方法，并将非特定代码粘贴到其中，就在该代码我尝试通过传递的对象创建对象的各种尝试之前，大多数都会在代码中识别出新对象，但是所有方法（例如lookup.loadClass(fileToLookup))都显示为无法识别

if (databaseFolder.equals(CustomerFolder)) {
            CustomerClass lookup = new CustomerClass();
            //region nonspecific code on object
            lookup.loadClass(fileToLookup);
            String[] tempString = new String[lookup.positionIds.length * 2];
            String[] tempExpandString = new String[lookup.positionIds.length];
            String[] classData = lookup.getClassData();
            String[] positionNames = lookup.positionNames;

            for (int i = 0; i < lookup.positionIds.length; i++) {
                tempString[i * 2] = positionNames[i];
                if (lookup.positionExpandableToMultipleBoolean[i] && classData[i] != null && classData[i].contains(",")) {
                    tempString[i * 2 + 1] = "Multiple- Click to Expand";
                    tempExpandString[i] = classData[i];
                } else if (lookup.positionExpandableToMultipleBoolean[i]) {
                    tempString[i * 2 + 1] = lookup.expandablePositionIdToName(i, classData[i]);
                    tempExpandString[i] = classData[i];

                } else if(classData[i] == null){
                    tempString[i * 2 + 1] = "   ";
                } else
                    tempString[i * 2 + 1] = classData[i];
            }
            list = tempString;
            filesToExpand = tempExpandString;
            //endregion

        } else if (databaseFolder.equals(AddressFolder)) {
            AddressClass lookup = new AddressClass();
            //region nonspecific code on object
            lookup.loadClass(fileToLookup);
            String[] tempString = new String[lookup.positionIds.length * 2];
            String[] tempExpandString = new String[lookup.positionIds.length];
            String[] classData = lookup.getClassData();
            String[] positionNames = lookup.positionNames;

            for (int i = 0; i < lookup.positionIds.length; i++) {
                tempString[i * 2] = positionNames[i];
                if (lookup.positionExpandableToMultipleBoolean[i] && classData[i] != null && classData[i].contains(",")) {
                    tempString[i * 2 + 1] = "Multiple- Click to Expand";
                    tempExpandString[i] = classData[i];
                } else if (lookup.positionExpandableToMultipleBoolean[i]) {
                    tempString[i * 2 + 1] = lookup.expandablePositionIdToName(i, classData[i]);
                    tempExpandString[i] = classData[i];

                } else if(classData[i] == null){
                    tempString[i * 2 + 1] = "   ";
                } else
                    tempString[i * 2 + 1] = classData[i];
            }
            list = tempString;
            filesToExpand = tempExpandString;
            //endregion

        }

Answer 1

执行此操作的好方法是通过接口。您可以定义一个名为Lookup的接口，该接口具有定义的通用方法签名。然后让您的CustomerClass，AddressClass等实现该接口。这将使您可以执行以下操作：

Lookup lookup = null;
if (databaseFolder.equals(CustomerFolder)) {
    lookup = new CustomerClass();
} else {
    lookup = new AddressClass();
}
lookup.loadClass(fileToLookup);
//Rest of common code

Answer 2

安德鲁·阿里亚斯（Andrew Arias），谢谢你，这对我来说很好，我使所有类似的类都实现了我需要的所有方法的接口，而不仅仅是将通用代码保留在其下面，我能够将其发送给具有下面代码的方法，一些尝试和错误认识到，一旦我有了接口设置，我就可以将对象转换为方法中的新对象，这在我不断地修改几个代码块的过程中非常有用，因为我可以解决某些情况下可能产生的错误

//主代码

        if (databaseFolder.equals(CustomerFolder)) {
            CustomerClass lookup = new CustomerClass();
            try {
                lookupClass(lookup);
            } catch (ClassNotFoundException e) {Log.d(AppName,e.toString()); }catch (IllegalAccessException e) {Log.d(AppName,e.toString()); } catch (java.lang.InstantiationException e) { Log.d(AppName,e.toString()); }

//方法

public void lookupClass(Object test) throws ClassNotFoundException, IllegalAccessException, java.lang.InstantiationException {
    ClassInterface lookup = (ClassInterface) test;
//region nonspecific code on object
    lookup.loadClass(fileToLookup);
    String[] tempString = new String[lookup.positionIds.length * 2];
    String[] tempExpandString = new String[lookup.positionIds.length];
    String[] classData = lookup.getClassData();
    String[] positionNames = lookup.positionNames;
    for (int i = 0; i < lookup.positionIds.length; i++) {
        tempString[i * 2] = positionNames[i];
        if (lookup.positionExpandableToMultipleBoolean[i] && classData[i] != null && classData[i].contains(",")) {
            tempString[i * 2 + 1] = "Multiple- Click to Expand";
            tempExpandString[i] = classData[i];
        } else if (lookup.positionExpandableToMultipleBoolean[i]) {
            tempString[i * 2 + 1] = lookup.expandablePositionIdToName(i, classData[i]);
            tempExpandString[i] = classData[i];
        } else if(classData[i] == null){
            tempString[i * 2 + 1] = "   ";
        } else
            tempString[i * 2 + 1] = classData[i];
    }
    list = tempString;
    filesToExpand = tempExpandString;
    //endregion
}

有没有办法使用传递的类对象的方法？

2 个答案: