为什么 ArrayList<>.add() 不起作用? [英] Why isn't ArrayList<>.add() working?

问题描述

我是 Java 新手，目前正在使用 Android Studio.我只是不明白为什么 .add 不起作用.主题和作业只是自定义类.问题是弹出消息无法解析符号'添加'"并且整个过程失败.我已经导入了 java.util.ArrayList.

I'm new to Java and I'm currently using Android Studio. I just can't understand why .add isn't working. Subject and Assignments are just custom classes. The issue is that the message "Cannot resolve symbol 'add'" pops up and the whole thing fails. I have imported java.util.ArrayList.

ArrayList<Subject> mSubjects = new ArrayList<Subject>();
Subject cheese = new Subject("Cheese",new Assignment[]{new Assignment("Test 1",1.0f,1.0f,1.0f),new Assignment("Test 2",100f,100f,1.0f)},100f,4.0f);
mSubjects.add(cheese);

推荐答案

mSubjects.add(cheese);

将此方法放入您的 onCreate 方法中.

put this method in your onCreate method.

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