Java - 无法执行一系列 1-7 中的最后一个 if 语句

Question

“选择”变量用于调用不同的方法并执行不同的代码块。一切工作正常，除了当我想退出程序时(即当选择== 7时)。有谁知道这是为什么吗？

public class HW5Main {

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    boolean breakRequest = false;

    while(breakRequest == false){
    System.out.println("\nWelcome to JVHS, what would you like to do?");
    System.out.println("1. Admit a new dog (description unknown)");
    System.out.println("2. Admit a new dog (description known)");
    System.out.println("3. Display information about a particular dog");
    System.out.println("4. Adopt a dog");
    System.out.println("5. Euthanize a dog");
    System.out.println("6. Display information about the JVHS");
    System.out.println("7. Exit");
    int selection = scanner.nextInt();
    System.out.println("\nYour selection is "+ selection);

    HW5Dog dogObject = new HW5Dog();

    if(selection == 1)
        dogObject.addDog();

    if(selection == 2)
        dogObject.addDog2();

    if(selection == 3){
        dogObject.getAllDogs();
        //Ask which Dog you want and get its info
        System.out.println("Please enter the ID number of the dog you wish to display:");
        if(scanner.hasNextInt()){
            int dogID = scanner.nextInt();
            dogObject.getDog(dogID);    
        }
        else
            System.out.println("ERROR - INVALID INPUT: EXPECTING INTERGER, TRY AGAIN");
    }

    if(selection == 4){
        dogObject.getAllDogs();
        //Ask which Dog you want and get its info
        System.out.println("Please enter the ID number of the dog you wish to adopt:");
        if(scanner.hasNextInt()){
            int dogID = scanner.nextInt();
            dogObject.adopt(dogID);
        }
    }

    if(selection == 5){
        dogObject.getAllDogs();
        //Ask which Dog you want and get its info
        System.out.println("Please enter the ID number of the dog you wish to euthanize:");
        if(scanner.hasNextInt()){
            int dogID = scanner.nextInt();
            dogObject.euth(dogID);
    }

    if(selection == 6){
        dogObject.getJVHS();
    }

    if(selection == 7){
        System.out.println("Goodbye");
        scanner.close();
        breakRequest = true;
    }

    }
        }
    }
}

Answer 1

问题出在上面的选择 block 中:

if(selection == 5){
    dogObject.getAllDogs();
    //Ask which Dog you want and get its info
    System.out.println("Please enter the ID number of the dog you wish to euthanize:");
    if(scanner.hasNextInt()){
        int dogID = scanner.nextInt();
        dogObject.euth(dogID);
}

您没有关闭第二个 if 语句中的大括号。它应该是这样的:

if(selection == 5){
    dogObject.getAllDogs();
    //Ask which Dog you want and get its info
    System.out.println("Please enter the ID number of the dog you wish to euthanize:");
    if(scanner.hasNextInt()) {
        int dogID = scanner.nextInt();
        dogObject.euth(dogID);
    }
}

正如一些评论中提到的，您应该坚持使用清晰一致的缩进样式，以便将来更容易发现此问题。