Java 为什么我的else语句不起作用？

我正在尝试为我的编程课创建一个BART票价程序。然而，无论输入如何，我的结果总是-1。为什么我的程序不遵循else-if语句

public static void main(String[] args)
{
    Scanner input = new Scanner(System.in);

    System.out.println("Please enter the ticket type: ");
    String type = input.nextLine();

    System.out.println("Please enter the zone number: ");
    int zone = input.nextInt();

    if ((zone <= 2) && (type == "adult")){
        System.out.println("The fare is 20.");
    }   else if ((zone <= 2) && (type == "child")){
        System.out.println("The fare is 10.5.");
    }   else if ((zone == 3) && (type == "adult")){
        System.out.println("The fare is 30.5.");
    }   else if ((zone == 3) && (type == "child")){
        System.out.println("The fare is 20.");
    }   else if ((zone == 4) && (type == "child")){
        System.out.println("The fare is 20.");
    }   else if ((zone == 4) && (type == "adult")){
        System.out.println("The fare is 43.");
    }   else if ((zone > 4) || (type != "adult") || (type != "child"))
        System.out.println("-1");
    }

}

首先，你的最后一个if缺少一个{

另一个问题是比较两个字符串的方式。请改用.equals

下面是一个例子，以第一个if语句为例

你有：

if ((zone <= 2) && (type == "adult")){
        System.out.println("The fare is 20.");
    }

尝试：

此比较比较比较字符串值。在其余比较中执行此操作，您将看到所需的结果

if ((zone <= 2) && (type.equals("adult"))){
        System.out.println("The fare is 20.");
    }