Question

关于Java的Math.random()怎么使用？

有一道题，希望大家帮我做一下~谢谢了！
The program should simulate the following conversation：

User: Knock Knock! Who’s There?
Computer: Dewey
User: Dewey who?
Computer: Dewey has to listen to all this knocking?

When the user asks the first question, the first response will be generated randomly by the compute. The second response for the second question will be based on the first response. The responses will be based on the table below:

Response to Who’s There? Next Response
Dewey Dewey has to listen all this knocking?
General Lee Generally I do not tell jokes, okay?
Ken Ken we not have some better jokes?
Wanda Wanda where I put my keys!
这道题就是我问问题，然后电脑随机回复。

Answer 1

幸亏有点英语水平
意思就是如果第一个问题的回答是General Lee 第二个就必须是Generally I do not tell jokes, okay?其他一样 但是第一个问题的回答是随机的

public class Computer {

private static final String[] names = {"Dewey", "General Lee", "Ken", "Wanda"};
private static final String[] answers = {
"Dewey has to listen all this knocking?",
"Generally I do not tell jokes, okay?",
"Ken we not have some better jokes?",
"Wanda where I put my keys!"};

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (true) {
System.out.print("User:");
String str = in.next();
if (str.equals("quit")) {
System.out.println("Bye!");
System.exit(0);
}
System.out.print("Computer:");
int number = (int) (Math.random() * 4);
System.out.println(names[number]);
System.out.print("User:");
str = in.next();
if (str.equals("quit")) {
System.out.println("Bye!");
System.exit(0);
}
System.out.print("Computer:");
System.out.println(answers[number]);
}
}
}

Answer 2

产生一个(0,1]的随机数，直接赋值给变量