输出相同数字的 Java switch 语句 [英] Java switch statements outputting the same numbers

问题描述

每次我运行代码时，我的对象随机生成代码总是将武器伤害设置为相同的数字.虽然它有时会在 3(匕首)、4、6 和 8 之间变化，但地图上每个物品的伤害都是一样的.我认为这可能是因为在每个案例结束时我都没有退货，但这不是案例"，仍然只输出相同的少量损坏.

My object randomised spawn code always sets a weapons damage to the same number every time I run the code. Although it sometimes changes between 3 (for daggers), 4, 6 and 8, but every item's damage on the map is the same. I thought it might be because there were no breaks back when I had returns at the end of each case however this wasn't the 'case' and still only outputs the same few damages.

所有剑伤害的示例截图为 4:http://puu.sh/hevSP/7974257751.png

Example screenshot of all the sword damages as 4: http://puu.sh/hevSP/7974257751.png

这不是硬编码的伤害数字，因为我在每个数字中都添加了random.nextInt(5)"，它们仍然是相同的数字.

It's not the hard coded damage numbers because I added 'random.nextInt(5)' to each of them and they were all still the same number.

末尾的注释剑代码对我输入的任何内容造成了损害，所以我知道这是导致问题的 switch 语句之一.谢谢.

The commented sword code at the end sets the damage to whatever I put in, so I know it's one of the switch statements causing the problem. Thanks.

    public static Object itemRoulette(String quality, int X, int Y) {

    Object returnItem = null;

    //Rolls a random item based on the input quality between 1-3.
    switch(quality)
        {
        //First tier of quality.
        case "1":
            {
            switch (random.nextInt(5) + 1)
                {
                case 1: {Dagger dagger = new Dagger(); World[X][Y].treasureName = "dagger"; dagger.setDamage(2); World[X][Y].treasureName = "dagger"; returnItem = dagger; break;}
                case 2: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 3: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(4); returnItem = sword; break;}
                case 4: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 5: {Dagger dagger = new Dagger(); World[X][Y].treasureName = "dagger"; dagger.setDamage(3); returnItem = dagger; break;}
                }
             break;
            }

        //Second tier of quality
        case "2":
            {
            switch (random.nextInt(5) + 1)
                {
                case 1: {Dagger dagger = new Dagger(); World[X][Y].treasureName = "dagger"; dagger.setDamage(4); returnItem = dagger; break;}
                case 2: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 3: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(5); sword.setDefence(1); returnItem = sword; break;}
                case 4: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 5: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(6); sword.setDefence(1); returnItem = sword; break;}
                }
             break;
            }

        //Third tier of quality.
        case "3":
            {
            switch (random.nextInt(5) + 1)
                {
                case 1: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(6); sword.setDefence(1); returnItem = sword; break;}
                case 2: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 3: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(7); sword.setDefence(1); returnItem = sword; break;}
                case 4: {Potion potion = new Potion(); World[X][Y].treasureName = "potion"; potion.setType("health"); returnItem = potion; break;}
                case 5: {Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(8); sword.setDefence(2); returnItem = sword; break;}
                }
             break;
            }

        case "dagger":
            {
            World[X][Y].treasureName = "dagger";
            Dagger dagger = new Dagger();
            dagger.setDamage(3);
            dagger.setDefence(0);
            returnItem = dagger;
            break;
            }

        case "sword":
            {
            World[X][Y].treasureName = "sword";
            Sword sword = new Sword();
            sword.setDamage(6);
            sword.setDefence(1);
            returnItem = sword;
            break;
            }
        }

    //Sword sword = new Sword(); World[X][Y].treasureName = "sword"; sword.setDamage(40); returnItem = sword;

    return returnItem;
    }

推荐答案

你必须定义这个类并使用它的随机函数而不是调用random.nextInt

you must define this class and use its random function instead of calling random.nextInt

public class Numbers {
    Random randnum;

    public Numbers() {
        randnum = new Random();
        randnum.setSeed(123456789);
    }

    public int random(int i){
        return randnum.nextInt(i);
    }
}

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