AP CSA FRQ Q2 Past Paper 五年真题汇总 2023-2019

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2023 FRQ Q2 Sign

This question involves methods that distribute text across lines of an electronic sign. The electronic sign and the text to be displayed on it are represented by the Sign class. You will write the complete Sign class, which contains a constructor and two methods.

The Sign class constructor has two parameters. The first parameter is a String that contains the message to be displayed on the sign. The second parameter is an int that contains the $width$ of each line of the sign. The width is the positive maximum number of characters that can be displayed on a single line of the sign.
A sign contains as many lines as are necessary to display the entire message. The message is split among the lines of the sign without regard to spaces or punctuation. Only the last line of the sign may contain fewer characters than the width indicated by the constructor parameter
The following are examples of a message displayed on signs of different widths. Assume that in each example, the sign is declared with the width specified in the first column of the table and with the message "Everything on sale,please come in", which contains 34 characters.

In addition to the constructor, the Sign class contains two methods.
The numberOfLines method returns an int representing the number of lines needed to display the text on the sign. In the previous examples, numberOfLines would return 3, 2, and 1, respectively for the sign widths shown in the table.

The getLines method returns a String containing the message broken into lines separated by semicolons (😉 or returns null if the message is the empty string. The constructor parameter that contains the message to be displayed will not include any semicolons. As an example, in the first row of the preceding table, getLines would return "Everything on s;ale, please com;e in".No semicolon should appear at the end of the String returned by getLines.

The following table contains a sample code execution sequence and the corresponding results. The code execution sequence appears in a class other than Sign.

Statement	Method Call Return Value (blank if none)	Explanation
String str;
int x;
Sign sign1 = new Sign("ABC222DE", 3);		The message for sign1 contains 8 characters, and the sign has lines of width 3.
x = sign1.numberOfLines();	3	The sign needs three lines to display the 8-character message on a sign with lines of width 3.
str = sign1.getLines();	"ABC;222;DE"	Semicolons separate the text displayed on the first, second, and third lines of the sign.
str = sign1.getLines();	"ABC;222;DE"	Successive calls to getLines return the same value.
Sign sign2 = new Sign("ABCD", 10);		The message for sign2 contains 4 characters, and the sign has lines of width 10.
x = sign2.numberOfLines();	1	The sign needs one line to display the 4-character message on a sign with lines of width 10.
str = sign2.getLines();	"ABCD"	No semicolon appears, since the text to be displayed fits on the first line of the sign.
Sign sign3 = new Sign("ABCDEF", 6);		The message for sign3 contains 6 characters, and the sign has lines of width 6.
x = sign3.numberOfLines();	1	The sign needs one line to display the 6-character message on a sign with lines of width 6.
str = sign3.getLines();	"ABCDEF"	No semicolon appears, since the text to be displayed fits on the first line of the sign.
Sign sign4 = new Sign("", 4);