Java while循环哨兵问题

Question

我的while循环运行良好，并且sentinel（String End）值结束循环...问题是当输入sentinel时，会发生else println语句。

我希望sentinel值结束循环，而不是发生最后的else语句

while (!nameSearch.equalsIgnoreCase(sentinel)) {

      showMenu();
      nameSearch = keyboard.nextLine();

      if (girlList.contains(nameSearch.toLowerCase()) && 
         boyList.contains(nameSearch.toLowerCase())) {
         System.out.println("Name found in both boy and girl names\n");
       } else if (boyList.contains(nameSearch.toLowerCase())) {
            System.out.println("Boy name found");
       } else if (girlList.contains(nameSearch.toLowerCase())) {
             System.out.println("Girl name found");
       } else {
             System.out.println("Name not found");
       }
}

System.out.println("program end");

Answer 1

有几种方法可以达到你想要的效果。一种方法是检查是否输入了标记值，如果是，则立即退出循环：

if ((nameSearch = keyboard.nextLine()).equalsIgnoreCase(sentinel)) {
    break;
}

Answer 2

一旦值等于标记值

就断开循环

showMenu();
      nameSearch = keyboard.nextLine();
      if(namesearch.equals("sentinelvalue"))//replace your sentinel value
          break;

如果哨兵价值无关紧要，可以使用

if(namesearch.equalsIgnoreCase("sentinelvalue"))//replace your sentinel value
              break;