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java中可变参数和简单游戏

作者：我家自动化 | 2024-04-17 19:09:13

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java中可变参数和简单游戏

可变参数：
就是一种特殊形参，定义在方法，构造器的形参列表中，格式是：数据类型...参数名称

可变参数的好处：
灵活的接收数据

特点：可以不传数据给它，可以传一个数据或者多个数据给它，也可以传一个数组给它

可变参数的注意事项：

可变参数在方法内部就是一个数组

一个形参列表中的可变参数只有一个

可变参数必须在形参列表的最后面

  1. public class test {
  2.     public static void main(String[] args) {
  3.         ttt();//可以不传数据
  4.  
  5.         ttt(1);//可以传一个数据
  6.         ttt(1,2,3);//可以传多个数据
  7.  
  8.         ttt(new int[]{1,2,3});//可以传一个数组
  9.     }
  10.     public static void ttt(int...nums)
  11.     {
  12.         //可变参数在方法内部是一个数组
  13.         System.out.println(Arrays.toString(nums));
  14.     }
  15.     //只能有一个可变参数，且必须在形参列表的最后
  16.     public static void ppp(int age,int...s)
  17.     {}
  18. }

Collections类：
是一个用来操作集合的工具类

public static <T> boolean addAll(Collection<? super T> c, T... elements)

Adds all of the specified elements to the specified collection. Elements to be added may be specified individually or as an array.

往集合中批量添加数据

public static void shuffle(List<?> list)

Randomly permutes the specified list using a default source of randomness. 

打乱List集合中的元素顺序 

void sort(List<T> list)

对List集合中的元素进行升序排序 

public static <T> void sort(List<T> list, Comparator<? super T> c)

Sorts the specified list according to the order induced by the specified comparator. 

对List集合中的元素，按照比较器对象指定的规则进行排序 

  1. public class test {
  2.     public static void main(String[] args) {
  3.         //1 addAll
  4.         ArrayList<String>list=new ArrayList<>();
  5.         Collections.addAll(list,"java1","java2","java3");
  6.         System.out.println(list);
  7.  
  8.         //2:shuffle
  9.         Collections.shuffle(list);
  10.         System.out.println(list);//[java2, java3, java1]
  11.  
  12.         //sort,默认升序
  13.         Collections.sort(list);
  14.         System.out.println(list);//[java1, java2, java3]
  15.  
  16.         //sort排序自定义对象
  17.         ArrayList<Student>list1=new ArrayList<>();
  18.         list1.add(new Student("aa",10));
  19.         list1.add(new Student("bb",90));
  20.         list1.add(new Student("cc",22));
  21.         Collections.sort(list1, new Comparator<Student>() {
  22.             @Override
  23.             public int compare(Student o1, Student o2) {
  24.                 return o1.getAge()-o2.getAge();//按照年龄升序
  25.             }
  26.         });
  27.         Collections.sort(list1,(o1,o2)->o1.getAge()-o2.getAge());
  28.         System.out.println(list1);
  29.     }
  30. }public class test {
  31.     public static void main(String[] args) {
  32.         //1 addAll
  33.         ArrayList<String>list=new ArrayList<>();
  34.         Collections.addAll(list,"java1","java2","java3");
  35.         System.out.println(list);
  36.  
  37.         //2:shuffle
  38.         Collections.shuffle(list);
  39.         System.out.println(list);//[java2, java3, java1]
  40.  
  41.         //sort,默认升序
  42.         Collections.sort(list);
  43.         System.out.println(list);//[java1, java2, java3]
  44.  
  45.         //sort排序自定义对象
  46.         ArrayList<Student>list1=new ArrayList<>();
  47.         list1.add(new Student("aa",10));
  48.         list1.add(new Student("bb",90));
  49.         list1.add(new Student("cc",22));
  50.         Collections.sort(list1, new Comparator<Student>() {
  51.             @Override
  52.             public int compare(Student o1, Student o2) {
  53.                 return o1.getAge()-o2.getAge();//按照年龄升序
  54.             }
  55.         });
  56.         Collections.sort(list1,(o1,o2)->o1.getAge()-o2.getAge());
  57.         System.out.println(list1);
  58.     }
  59. }

以下是一个简单的游戏：
牌类：

  1. public class Card {
  2.     private String number;
  3.     private String color;
  4.     private int size;
  5.  
  6.     public Card() {
  7.     }
  8.  
  9.     public Card(String number, String color, int size) {
  10.         this.number = number;
  11.         this.color = color;
  12.         this.size = size;//牌的大小
  13.     }
  14.  
  15.     public String getNumber() {
  16.         return number;
  17.     }
  18.  
  19.     public void setNumber(String number) {
  20.         this.number = number;
  21.     }
  22.  
  23.     public String getColor() {
  24.         return color;
  25.     }
  26.  
  27.     public void setColor(String color) {
  28.         this.color = color;
  29.     }
  30.  
  31.     public int getSize() {
  32.         return size;
  33.     }
  34.  
  35.     public void setSize(int size) {
  36.         this.size = size;
  37.     }
  38.  
  39.     @Override
  40.     public String toString() {
  41.         return "Card{" +
  42.                 "number='" + number + '\'' +
  43.                 ", color='" + color + '\'' +
  44.                 ", size=" + size +
  45.                 '}';
  46.     }
  47. }

 操作牌类

  1. public class Room {
  2.     private ArrayList<Card>list=new ArrayList<>();
  3.  
  4.     public Room() {
  5.         String []numbers={"3","4","5","6","7","8","9","10","J","Q","K","A","2"};
  6.         int size=0;
  7.         String []colors={"方块","梅花","红桃","黑桃"};
  8.         for (String number : numbers) {
  9.             size++;
  10.             for (String color : colors) {
  11.                 Card c=new Card(number,color,size);
  12.                 list.add(c);
  13.             }
  14.         }
  15.         Card c1=new Card("","小王",size++);
  16.         Card c2=new Card("","大王",size);
  17.         Collections.addAll(list,c1,c2);
  18.         System.out.println(list);
  19.     }
  20.     public void randomCard()
  21.     {
  22.         System.out.println("开始洗牌");
  23.         Collections.shuffle(list);
  24.         //System.out.println(list);
  25.     }
  26.     public void devoteCard()
  27.     {
  28.         ArrayList<Card>list1=new ArrayList<>();
  29.         ArrayList<Card>list2=new ArrayList<>();
  30.         ArrayList<Card>list3=new ArrayList<>();
  31.  
  32.         for (int i = 0; i < list.size()-3; i++) {//只发51张牌
  33.             Card c=list.get(i);
  34.             if(i%3==0)
  35.             {
  36.                 list1.add(c);
  37.             }
  38.             else if(i%3==1)
  39.             {
  40.                 list2.add(c);
  41.             }
  42.             else
  43.             {
  44.                 list3.add(c);
  45.             }
  46.         }
  47.         sortCard(list1);
  48.         sortCard(list2);//对牌进行大小排序
  49.         sortCard(list3);
  50.  
  51.         System.out.println(list1);
  52.         System.out.println(list2);
  53.         System.out.println(list3);
  54.         System.out.println("底牌是");
  55.         List<Card> LastCard= list.subList(list.size()-3,list.size());//包前不包后
  56.         System.out.println(LastCard);
  57.     }
  58.  
  59.     private void sortCard(ArrayList<Card> list2) {
  60.         /*Collections.sort(list2, new Comparator<Card>() {
  61.             @Override
  62.             public int compare(Card o1, Card o2) {
  63.                 return o1.getSize()-o2.getSize();
  64.             }
  65.         });
  66.     }*/
  67.         Collections.sort(list2, (o1, o2) -> o1.getSize() - o2.getSize());
  68.     }
  69. }

test:

  1. public class test {
  2.     public static void main(String[] args) {
  3.         Room r=new Room();
  4.         r.randomCard();
  5.         ArrayList<Card>[]lists=new ArrayList[3];
  6.         r.devoteCard();
  7.  
  8.     }
  9. }

 

 结果：

[Card{number='3', color='方块', size=1}, Card{number='3', color='梅花', size=1}, Card{number='3', color='红桃', size=1}, Card{number='3', color='黑桃', size=1}, Card{number='4', color='方块', size=2}, Card{number='4', color='梅花', size=2}, Card{number='4', color='红桃', size=2}, Card{number='4', color='黑桃', size=2}, Card{number='5', color='方块', size=3}, Card{number='5', color='梅花', size=3}, Card{number='5', color='红桃', size=3}, Card{number='5', color='黑桃', size=3}, Card{number='6', color='方块', size=4}, Card{number='6', color='梅花', size=4}, Card{number='6', color='红桃', size=4}, Card{number='6', color='黑桃', size=4}, Card{number='7', color='方块', size=5}, Card{number='7', color='梅花', size=5}, Card{number='7', color='红桃', size=5}, Card{number='7', color='黑桃', size=5}, Card{number='8', color='方块', size=6}, Card{number='8', color='梅花', size=6}, Card{number='8', color='红桃', size=6}, Card{number='8', color='黑桃', size=6}, Card{number='9', color='方块', size=7}, Card{number='9', color='梅花', size=7}, Card{number='9', color='红桃', size=7}, Card{number='9', color='黑桃', size=7}, Card{number='10', color='方块', size=8}, Card{number='10', color='梅花', size=8}, Card{number='10', color='红桃', size=8}, Card{number='10', color='黑桃', size=8}, Card{number='J', color='方块', size=9}, Card{number='J', color='梅花', size=9}, Card{number='J', color='红桃', size=9}, Card{number='J', color='黑桃', size=9}, Card{number='Q', color='方块', size=10}, Card{number='Q', color='梅花', size=10}, Card{number='Q', color='红桃', size=10}, Card{number='Q', color='黑桃', size=10}, Card{number='K', color='方块', size=11}, Card{number='K', color='梅花', size=11}, Card{number='K', color='红桃', size=11}, Card{number='K', color='黑桃', size=11}, Card{number='A', color='方块', size=12}, Card{number='A', color='梅花', size=12}, Card{number='A', color='红桃', size=12}, Card{number='A', color='黑桃', size=12}, Card{number='2', color='方块', size=13}, Card{number='2', color='梅花', size=13}, Card{number='2', color='红桃', size=13}, Card{number='2', color='黑桃', size=13}, Card{number='', color='小王', size=13}, Card{number='', color='大王', size=14}]
开始洗牌
[Card{number='3', color='方块', size=1}, Card{number='3', color='黑桃', size=1}, Card{number='4', color='黑桃', size=2}, Card{number='4', color='梅花', size=2}, Card{number='4', color='方块', size=2}, Card{number='6', color='方块', size=4}, Card{number='8', color='梅花', size=6}, Card{number='8', color='黑桃', size=6}, Card{number='9', color='梅花', size=7}, Card{number='10', color='黑桃', size=8}, Card{number='10', color='方块', size=8}, Card{number='J', color='红桃', size=9}, Card{number='J', color='梅花', size=9}, Card{number='J', color='黑桃', size=9}, Card{number='K', color='红桃', size=11}, Card{number='A', color='黑桃', size=12}, Card{number='2', color='黑桃', size=13}]
[Card{number='3', color='红桃', size=1}, Card{number='6', color='黑桃', size=4}, Card{number='6', color='红桃', size=4}, Card{number='7', color='方块', size=5}, Card{number='7', color='红桃', size=5}, Card{number='7', color='黑桃', size=5}, Card{number='10', color='梅花', size=8}, Card{number='J', color='方块', size=9}, Card{number='Q', color='黑桃', size=10}, Card{number='K', color='方块', size=11}, Card{number='K', color='梅花', size=11}, Card{number='K', color='黑桃', size=11}, Card{number='A', color='红桃', size=12}, Card{number='2', color='梅花', size=13}, Card{number='2', color='红桃', size=13}, Card{number='', color='小王', size=13}, Card{number='', color='大王', size=14}]
[Card{number='3', color='梅花', size=1}, Card{number='4', color='红桃', size=2}, Card{number='5', color='红桃', size=3}, Card{number='5', color='梅花', size=3}, Card{number='5', color='方块', size=3}, Card{number='5', color='黑桃', size=3}, Card{number='7', color='梅花', size=5}, Card{number='8', color='红桃', size=6}, Card{number='8', color='方块', size=6}, Card{number='9', color='黑桃', size=7}, Card{number='9', color='方块', size=7}, Card{number='9', color='红桃', size=7}, Card{number='10', color='红桃', size=8}, Card{number='Q', color='红桃', size=10}, Card{number='Q', color='梅花', size=10}, Card{number='Q', color='方块', size=10}, Card{number='2', color='方块', size=13}]
底牌是
[Card{number='A', color='梅花', size=12}, Card{number='6', color='梅花', size=4}, Card{number='A', color='方块', size=12}]
 

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