04_数组

/**
 * 冒泡排序
 * @author jliu.l
 * @2020年7月6日
 * 
 */
public class Demo01 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        int[] arr = {2,5,8,3,6,7};
        System.out.print("排序前：");
        for (int i : arr) {
            System.out.print(i+" ");
        }
        System.out.println();

        for (int i = 0; i < arr.length; i++) {
            boolean flag = true;
            for (int j = 0; j < arr.length-1-i; j++) {
                if(arr[j]>arr[j+1]) {
                    int temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                    
                    flag = false;
                }
            }
            if (flag) {
                break;
            }    
        }
        System.out.print("排序后：");
        for (int i : arr) {
            System.out.print(i+" ");
        }
    }
}

/**
 * 功能：定义一个方法实现任意字符串反向输出功能，比如：“abcde”,结果为：“edcba”
 * @author jliu.l
 * @2020年7月6日
 * 
 */
public class Demo02 {
    public static void main(String[] args) {
        String str = "abcdef";
        Tools.reverser(str);
        
        int[] num = {1,6,5,10,2,0,9};
        Tools.getIndex(num);
    }
}

/**
 * @author jliu.l
 * @2020年7月6日
 * 
 */
public class Poker {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        String[] num = {"2","3","4","5","6","7","8","9","10","J","Q","k","A"};
        String[] str = {"♠","♥","♣","♦"};
        
        String[] poker = new String[str.length*num.length];
        
        //组合54张牌
        poker = Tools.combinationPoker(str,num);
        //Tools.printPoker(poker);
        //打乱牌序
        poker = Tools.breakPoker(poker);
        
        //玩家
        String[] player = {"小鹿","小明","小杨"};
        int flag = Tools.flag();
        
        //发牌
        Tools.handoutPoker(poker,player,flag);
    }
}

/**
 * @author jliu.l
 * @2020年7月6日
 * 
 */
public class Tools {
    /**
      * 实现任意字符串反向输出功能
     * @param str 
     * 
     */
    public static void reverser(String str) {
        // TODO 自动生成的方法存根
        System.out.println("反向输出前："+str);
        String  str1 = "";
        for (int i = 0; i < str.length(); i++) {
            str1 = str.charAt(i) + str1;
        }
        System.out.println("反向输出后："+str1);
    }
    
    /*j = 0        index = 1
     * 1    1
     * 2    3
     * 3 4
     * 
     * 
      * 定义一个整数数组，找到其中的最大值和最小值的索引并输出
     */
    public static void getIndex(int[] num) {
        int max = num[0];
        int min = num[0];
        int maxdex = 0;
        int mindex = 0;
        for (int j=0; j < num.length-1; j++) {
            if(max < num[j+1]) {
                max = num[j+1];
                maxdex = j+1;
            }
            
            if(min > num[j+1]) {
                min= num[j+1];
                mindex = j+1;
            }
        }
        System.out.println(Arrays.toString(num)+"中最大值"+max+"的索引是："+(maxdex));
        System.out.println(Arrays.toString(num)+"中最小值"+min+"的索引是："+(mindex));
    }
    
    //binarySearch 二分查找
    public static void binarySearch() {
        int[] arr = {1,3,5,9,6,7,8};
        
        if(Arrays.binarySearch(arr,3) >= 0) {
            System.out.println("找到了");
        }else {
            System.out.println("没找到");
        }
    }
    
    /**
     * 组合牌
     * alt+shift+J
     * @param str
     * @param num
     */
    public static String[] combinationPoker(String[] str, String[] num) {
        // TODO 自动生成的方法存根
        String[] poker = new String[str.length*num.length+2];
        int index = 0;
        poker[str.length*num.length] = "大王";
        poker[str.length*num.length+1] = "小王";

        for (int j = 0; j < num.length; j++) {
            for (int i = 0; i < str.length; i++) {
            poker[index++] = str[i]+num[j];
            }
        }
        
        System.out.println("组合牌：");
        printPoker(poker);
        return poker;
    }

    /**
     * 输出牌
     * @param poker
     */
    public static void printPoker(String[] poker) {
        for (int i = 0; i < poker.length; i++) {
            System.out.print(poker[i]+" ");
            if((i+1)%6 ==0 ) {
            System.out.println();
            }
        }
        System.out.println();
        System.out.println("----------------------------");
    }

    
    
    /**
     * 打乱牌序
     * @param str
     * @return
     */
    public static String[] breakPoker(String[] str) {
        String[] poker = str;
        for (int i = 0; i < poker.length; i++) {
            int index = (int) (Math.random()*54);
            int index1 = (int) (Math.random()*54);
            if(index != index1) {
                String temp = poker[index];
                poker[index] = poker[index1];
                poker[index1] = temp;
            }
        }
        
        System.out.println("打散后的牌：");
        printPoker(poker);
        return poker;
    }
    
    public static int flag() {
        int index = (int) (Math.random()*3+1);
        int flag = 0;
        if(index == 1) {
            flag = 1;
        }
        if(index == 2) {
            flag = 2;
        }
        if(index == 3) {
            flag = 3;
        }
        return flag;
    }
    

    
    /**
     * 输出地主多余的3张牌
     * @param str
     */
    public static void printDz(String[] str) {
        System.out.print(str[str.length-3]+" "+str[str.length-2]+" "+str[str.length-1]);
    }
    
    /**
     * 发牌（地主多三张）
     * @param str
     * @param player
     */
    public static void handoutPoker(String[] str,String[] player,int flag) {
        
        //String[] player1Poker = new String[(str.length-3)/3];
        
        if(flag == 1) {
            System.out.print("地主"+player[0]+"的牌是：");
        }else {
            System.out.print(player[0]+"的牌是：");
            }
        for (int i = 0; i < str.length-3; i++) {
            
            if(i%3==0) {
                System.out.print(str[i]+" ");
            }
        }
        if(flag == 1) {
            printDz(str);
        }
    
        
        System.out.println();
        if(flag == 2) {
            System.out.print("地主"+player[1]+"的牌是：");
        }else {
            System.out.print(player[1]+"的牌是：");
            }
        for (int i = 0; i < str.length-3; i++) {
            
            if(i%3==01) {
                System.out.print(str[i]+" ");
            }
        }
        if(flag == 2) {
            printDz(str);
        }
        
        
        System.out.println();
        if(flag == 3) {
            System.out.print("地主"+player[2]+"的牌是：");
        }else {
            System.out.print(player[2]+"的牌是：");
            }
        for (int i = 0; i < str.length-3; i++) {
            
            if(i%3==2) {
                System.out.print(str[i]+" ");
            }
        }
        if(flag == 3) {
            printDz(str);
        }
    }
}

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