The four FRQ types

Java for AP CS A Lesson 19 1:47 English narration · English + 中文 subtitles burned in

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The free-response section is four questions, and every year they are the same four shapes. 自由回答部分是四道题，而每一年它们都是同样的四种形状。

Question one asks you to write a method from a description — that is lessons three, four and five. 第一题让你照着一段描述写一个方法—— 那是第 3、4、5 课。

Question two asks for a whole class from a specification, which is lessons six and seven. 第二题要你照着规范写一整个类，那是第 6、7 课。

Question three works on an array or an ArrayList, lessons eight to eleven. 第三题在数组或 ArrayList 上做文章，第 8 到 11 课。

And question four works on a grid, which is lesson twelve. 而第四题在一张网格上做文章，那是第 12 课。

Whichever type it is, start the same way: read the method signature before you write a line. 不管是哪一种类型，开头的做法都一样：在动笔之前，先把方法签名读一遍。

It returns an int, so you must return a number. 它返回 int，所以你必须返回一个数字。

It takes an array, so you will traverse it. 它接收一个数组，所以你要遍历它。

It takes a limit, so there is an if inside that loop. 它接收一个上限，所以那个循环里面得有一个 if。

And check whether it is static, because writing the wrong header costs a mark before you have done anything. 还要看清它是不是 static，因为方法头写错，你还什么都没做就先丢了一分。

And the most useful thing to know about this paper: marks are given part by part, and each piece earns its own. 而关于这张卷子，最有用的一点是：分是一块一块给的，每一块自己挣自己的分。

A correct header. 一个正确的方法头。

A loop over the array. 一个遍历数组的循环。

The right condition inside it. 循环里面那个正确的条件。

Returning the counter. 把计数器返回出去。

A method that is half right still scores, and a blank one never does. 一个只写对一半的方法照样得分，而空着的那个永远不得分。

So write something for every part, even when you cannot finish it. 所以每一问都写点东西，哪怕你写不完。

Four things to close the course. 用四点给这门课收尾。

One: the four FRQ types are the same every year. 第一：四种自由回答题型每年都一样。

Two: read the method signature before you write. 第二：动笔之前先读方法签名。

Three: marks are given part by part, so never leave a blank. 第三：分是一块一块给的，所以永远不要留空白。

Four: name the type, and you know which lesson to revise. 第四：说得出题型，你就知道该去复习哪一课。

That is all nineteen lessons — well done, and good luck. 十九课到此全部走完——做得好，祝你顺利。