Question

所以我试图制作一个程序，为学校提出两个问题。我遇到的问题是当我只想要一个时，java会不断打印多条消息。 any是否可以告诉我该怎么做？这是代码：

  if (answer1.equals("inside") ||
     answer1.equals("outside") ||
     answer1.equals("both") ) 
     System.out.println("Question 2) Is it a living thing?(yes/no)");
     answer2 = keyboard.next();

  if (answer2.equals("yes") ) 
     System.out.println("Then what else could you be thinking of besides a houseplant?!");

  if (answer2.equals("no") ) 
     System.out.println("Then what else could you be thinking of besides a shower curtain?!");

  if (answer2.equals("yes") ) 
     System.out.println("Then what else could you be thinking of besides a bison?!");

  if (answer2.equals("no") ) 
     System.out.println("Then what else could you be thinking of besides a billboard?!");

  if (answer2.equals("yes") ) 
     System.out.println("Then what else could you be thinking of besides a dog?!");

  if (answer2.equals("no") ) 
     System.out.println("Then what else could you be thinking of besides a cell phone?!");
  }

}

Answer 1

您可以使用switch语句来完成此操作，而无需使用if / else语句。但是，如果没有像在问题中那样打印出多条消息，则无法在多个if语句中检查“是”和“否”。

创建一个参数设置为answer2.toUpperCase（）的开关，这样每个答案都可以正常工作，忽略大小写。

如果大小写等于参数，开关将执行案例中的所有内容。结束每个案例添加“休息”;最后。

switch(answer2.toUpperCase()) {

case "YES":

System.out.println("What else could you be thinking of besides a houseplant?!");

break;

case "NO":

System.out.println("Then what else could you be thinking of besides a shower curtain?!");

break;

//And add the rest here

}

Answer 2

仅使用if语句来检查某些内容。

逻辑（注意：不是确切的代码，只有逻辑）：

//may use a while loop asking the question until a desired answer
System.out.println("(Question 1) Is it a living thing?(yes/no)");
String answerOne = //get user input;
System.out.println("(Question 2) Is it a dead thing?(yes/no)");
String answerTwo = //get user input;

if (answerOne.equals("yes") && answerTwo.equals("no") ) {
    System.out.println("it is a living thing!");
}
if (answerOne.equals("no") && answerTwo.equals("yes") ) {
    System.out.println("its DEAD!");
}

如何使java只用if语句打印一条消息

2 个答案: