Java - If-Else - 不可访问的内部对象声明

Question

public class RunProg {
    static int input1; //for creating new human;
    static boolean Married; //for knowing if married or not
    static String isMarried; //for the YES or No of Married Boolean

public static void main(String[] args) {


    Scanner input = new Scanner(System.in);


    System.out.print("What would you like to do? \n 1-Create new Human?\n");
    input1 = input.nextInt();
    input.nextLine();

    //Inputs for The NEW HUMAN
    if (input1 == 1) {
        System.out.println("Enter name:");
        String Name = input.nextLine();

        System.out.println("Good! Now enter the age of " + Name + ": ");
        int Age = input.nextInt();
        System.out.println("Well done! Now enter length: ");
        int Length = input.nextInt();
        input.nextLine();

        System.out.println("Finally, is he/she married? ('YES' or 'NO') ");
        isMarried = input.nextLine();


        if (isMarried == "YES") {
            Married = true;
            Human h1 = new Human(Name, Age, Length, Married);
        }

         else if (isMarried == "NO") {
            Married = false;
            Human h1 = new Human(Name, Age, Length);
        }

    }

如何修改此代码以使 h1 在 if-else 内部和外部都可访问 没有在 if-else 之外声明它？ 这是解决对象的可访问性问题，该可访问性严格限定在 if-else 语句的括号之间 我在问是否有办法让括号外的“内部”可访问（我完全理解变量的范围；所以请不要用范围、命名约定和外部声明来打扰我）

Answer 1

if-else 块怎么办？

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


    System.out.print("What would you like to do? \n 1-Create new Human?\n");
    input1 = input.nextInt();
    input.nextLine();

    //Inputs for The NEW HUMAN
    if (input1 == 1) {
        System.out.println("Enter name:");
        String Name = input.nextLine();

        System.out.println("Good! Now enter the age of " + Name + ": ");
        int Age = input.nextInt();
        System.out.println("Well done! Now enter length: ");
        int Length = input.nextInt();
        input.nextLine();

        System.out.println("Finally, is he/she married? ('YES' or 'NO') ");
        isMarried = input.nextLine();

        Human h1 = new Human(Name, Age, Length, "YES".equals(isMarried));
    }
}

Answer 2

您必须将 h1 声明移动到外部范围才能在那里访问它。变量是块作用域的。然后你只需在 if 块中初始化变量。

if (input1 == 1) {
    Human h1;
    ...     

    if ("YES".equals(isMarried)) {
        Married = true;
        h1 = new Human(Name, Age, Length, Married);
    }

     else if ("NO".equals(isMarried)) {
        Married = false;
        h1 = new Human(Name, Age, Length);
    }

}

或重构以删除 If/Else 块：

Human h1 = new Human(Name, Age, Length, "YES".equals(isMarried));

编辑：切换到在“YES”上调用 .equals，因为它不会为空。