如何讓java只用if語句打印一條消息

Question

所以即時嘗試製作一個爲學校提出兩個問題的程序。我所擁有的問題是，當我只想要一個時，java會一直打印多條消息。是any一個能夠告訴我如何做到這一點的權利？下面是代碼：

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語句來完成這項不使用if/else語句。但是，您不能像在問題中一樣檢查多個if語句中的「是」和「否」，而不打印多條消息。

創建參數設置爲answer2.toUpperCase（）的開關，以便每個答案都能正常工作而忽略大小寫。

如果情況等於參數，交換機將執行一個案例中的所有內容。要結束每個案例，請添加「break」。最後。

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

僅使用if語句來檢查某些內容。

邏輯（注意：不是確切的代碼，只有邏輯）：

//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!"); 
}