java 如何创建具有 3 个条件的 if 语句？(爪哇)
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How can I create an if statement with 3 conditions? (Java)
提问by
I just started learning java a week ago. I am taking a class at my school. I am trying to create a quiz and I can't figure out how to print out the score. The quiz has three possibilities 3/3, 2/3, 1/3. The problem I am having is with the if statements near the end of the program.
我一周前才开始学习java。我正在我的学校上课。我正在尝试创建一个测验，但我不知道如何打印分数。测验有 3/3、2/3、1/3 三种可能性。我遇到的问题是程序末尾的 if 语句。
import java.io.*;
import static java.lang.System.*;
import java.util.Scanner;
class t1_lesson03_template{
public static void main (String str[]) throws IOException {
Scanner scan = new Scanner(System.in);
System.out.println("1. What do you type at the begining of a comment?");
String answer1 = "//";
String userinput1 = scan.nextLine();
if (userinput1.equals(answer1)) {
System.out.println(" Correct!");
}
if (!userinput1.equals(answer1)) {
System.out.println(" Wrong!");
}
String answer2 = ("(int)");
System.out.println("2. What do you type before a double to convert to an int?");
String userinput2 = scan.nextLine();
if (userinput2.equals(answer2)) {
System.out.println(" Correct!");
}
if (!userinput2.equals(answer2)) {
System.out.println(" Wrong!");
}
String answer3 = ("int number = 5;");
System.out.println("3. Create an int called \"number\", and make it equal 5.");
String userinput3 = scan.nextLine();
if (userinput3.equals(answer3)) {
System.out.println(" Correct!");
}
if (!userinput3.equals(answer3)) {
System.out.println(" Wrong!");
}
if (userinput1.equals(answer1) && userinput2.equals(answer2) && userinput3.equals(answer3)) {
System.out.println("3/3 Awesome!");
}
else if (userinput1.equals(answer1) || userinput2.equals(answer2) || userinput3.equals(answer3)) {
System.out.println("2/3 Good job.");
}
else {
System.out.println("1/3 Try again.");
}
}
}
采纳答案by Elliott Frisch
This,
这，
else if (userinput1.equals(answer1) || userinput2.equals(answer2)
|| userinput3.equals(answer3)) {
should be something like
应该是这样的
else if ((userinput1.equals(answer1) && userinput2.equals(answer2)) ||
(userinput1.equals(answer1) && userinput3.equals(answer3)) ||
(userinput2.equals(answer2) && userinput3.equals(answer3))) {
butI would prefer a count. And an array to display your different messages. Something like
但我更喜欢count. 还有一个数组来显示您的不同消息。就像是
int count = 0;
if (userinput1.equals(answer1)) {
count++;
}
if (userinput2.equals(answer2)) {
count++;
}
if (userinput3.equals(answer3)) {
count++;
}
String[] result = { "0/3 None", "1/3 Try Again.", "2/3 Good Job.", "3/3 Awesome!" };
System.out.println(result[count]);
回答by user8967241
Just add braces before each condition in if class and else if such as
只需在 if 类和 else if 中的每个条件之前添加大括号，例如
if ((userinput1.equals(answer1)) && (userinput2.equals(answer2)) && (userinput3.equals(answer3))) {
System.out.println("3/3 Awesome!");
}
else if ((userinput1.equals(answer1)) || (userinput2.equals(answer2)) || (userinput3.equals(answer3))) {
System.out.println("2/3 Good job.");
}
