如何让java只用if语句打印一条消息

Question

所以即时尝试制作一个为学校提出两个问题的程序。我所拥有的问题是，当我只想要一个时，java会一直打印多条消息。是any一个能够告诉我如何做到这一点的权利？下面是代码：

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语句来完成这项不使用if/else语句。但是，您不能像在问题中一样检查多个if语句中的“是”和“否”，而不打印多条消息。

创建参数设置为answer2.toUpperCase（）的开关，以便每个答案都能正常工作而忽略大小写。

如果情况等于参数，交换机将执行一个案例中的所有内容。要结束每个案例，请添加“break”。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!"); 
}