在 Java 中找不到主类？ [复制]

Question

由于某种我无法弄清楚的原因，我一直在研究的程序现在没有运行。这是我收到的错误消息：

从它工作到现在我所做的只是添加另一个类，但即使在删除它之后，错误消息仍然存在。 Netbeans 也无济于事，代码中没有任何错误标记为红色。我还是Java的初学者，所以不知道需要多少才能找到错误，所以这里是所有代码：

public class ChooseYourOwn {
static class Character {
    private static int str;
    public Character() {
        int str = 0;
        int spd = 0;
        int agl = 0;
        int def = 0;
        int mag = 0;
        int wil = 0;
        int mp = 0;
        int hp = 0;
    }
    private Character(String name) {
    }
    }

/**
 *
 * @param args
 * @return
 */

public static int main(String[] args) {
    //set up character
    System.out.println("Choose a class:");
    String [] genusOptions;
    genusOptions = new String[] {"\n1-Warrior\n2-Mage\n3-Thief"};
    System.out.println(Arrays.toString(genusOptions));
    Scanner input1 = new Scanner(System.in);
    String genus;
    genus = input1.nextLine();
    System.out.println("Your character's stats are:");
    switch (genus) {
        case "1":
            {
                String[] array = new String[] {"\nStrength-15\nSpeed-5\nAgility-5\nDefense-10\nMagicDamage-5\nMagicDefense-0\nMagicPoints-5\nHitPoints-15\n"};
                System.out.println(Arrays.toString(array));
                int str = 5; 
                int spd = 2;
                int agl = 2;
                int def = 5;
                int mag = 0;
                int wil = 0;
                int mp = 0; 
                int hp = 10;
                break;
            }
        case "2":
            {
                String[] array = new String[] {"\nStrength-5\nSpeed-5\nAgility-5\nDefense-0\nMagicDamage-15\nMagicDefense-10\nMagicPoints-15\nHitPoints-5\n"};
                System.out.println(Arrays.toString(array));
                int str = 5; 
                int spd = 5;
                int agl = 5;
                int def = 0;
                int mag = 10;
                int wil = 10;
                int mp = 15; 
                int hp = 5;
                break;
            }
        case "3":
            {
                String[] array = new String[] {"\nStrength-10\nSpeed-15\nAgility-15\nDefense-10\nMagicDamage-10\nMagicDefense-5\nMagicPoints-10\nHitPoints-10\n"};
                System.out.println(Arrays.toString(array));
                int str = 10; 
                int spd = 15;
                int agl = 15;
                int def = 10;
                int mag = 10;
                int wil = 5;
                int mp = 10;
                int hp = 10;
                break;
            }
    }
    String[] array = new String[] {"\n1-Move\n2-Rest\n3-Attack\n4-Run\n5-Activate lever/button/chest\n6-Inventory\n7-Skills"};
    System.out.println("Choose a number to continue");
    System.out.println(Arrays.toString(array));
    Scanner input2;
    input2 = new Scanner(System.in);
    String action;
    action = input2.nextLine();
    switch (action) {
        case "1":
            {
                System.out.println("");
                //not done yet
                break;
            }
        case "2":
            {
                System.out.println("");
                //Rest, restores some health
                break;
            }
        case "3":
            {
                System.out.println("");
                int max = 100;
                int min = 0;
                Random rand = new Random();
                int randomNum = rand.nextInt((max - min) + 1) + min;
                int damage = 0;
                if (10 > randomNum) {
                    damage = (Character.str/100) * 10;
                } else if (20 > randomNum) {
                    damage = (Character.str/100) * 20;
                } else if (30 > randomNum) {
                    damage = (Character.str/100) * 30;
                } else if (40 > randomNum) {
                    damage = (Character.str/100) * 40;
                } else if (50 > randomNum) {
                    damage = (Character.str/100) * 50;
                } else if (60 > randomNum) {
                    damage = (Character.str/100) * 60;
                } else if (70 > randomNum) {
                    damage = (Character.str/100) * 70;
                } else if (80 > randomNum) {
                    damage = (Character.str/100) * 80;
                } else if (90 > randomNum) {
                    damage = (Character.str/100) * 90;
                } else if (100 > randomNum) {
                    damage = Character.str;
                }
                System.out.println( damage );
                break;
                }
        case "4":
            {
                System.out.println("");
                //not done yet
                break;
            }
        case "5":
            {
                System.out.println("");
                //not done yet
                break;
            }
        case "6":
            {
                System.out.println("");
                //not done yet
                break;
            }
        case "7":
            {
                System.out.println("");
                //not done yet
            }       
    }
    return (0);
}
}

以前这里也有人问过类似的问题，但没有一个有帮助，其他的也不清楚。非常感谢一个好的和连贯的答案，谢谢。

Answer 1

在 Java 中，主要方法签名是 public static void main(String[] args)，但在您的代码中，您使用的是 public static int main(String[] args)。

Answer 2

Java 的主要方法是这样声明的：

public static void main(String[] args) {
...
}

更多信息请访问Can a main method in Java return something?

Answer 3

您不能更改main 的返回类型。这个，

public static int main(String[] args)

必须是其中之一（根据这个有价值的Wikipedia article on Entry point）

public static void main(String[] args)
public static void main(String... args)
public static void main(String args[])

都是void，如果需要设置UNIX风格的返回类型，可以使用System.exit(int);引用Javadoc那个

终止当前运行的 Java 虚拟机。该参数用作状态码；按照惯例，非零状态码表示异常终止。