java学习之—递归实现变位字_java实现变位字-优快云博客

本文链接：https://blog.youkuaiyun.com/csdnXiaoZou/article/details/84966306

本文介绍了一种使用递归算法来生成一个单词所有可能的变位字的方法。通过一个Java程序实例展示了如何通过递归调用进行字符位置变换，最终输出给定字符串的所有排列组合。

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/**
 * 递归实现变位字
 * Create by Administrator
 * 2018/6/20 0020
 * 上午 10:23
 **/
public class AnagramApp {

    static int size;
    static int count;
    static char[] arrChar = new char[100];

    public static void doAnagram(int newSize){
        if(newSize == 1){
            return;
        }
        for (int i = 0; i < newSize; i++) {
            doAnagram(newSize - 1);
            if(newSize == 2){
                displayWord();
            }
            rotate(newSize);
        }
    }

    public static void rotate(int newSize){
        int i;
        int position = size - newSize;
        char temp = arrChar[position];
        for (i=position+1; i < size; i++) {
            arrChar[i-1] = arrChar[i];
        }
        arrChar[i-1] = temp;
    }

    public static void displayWord(){
        if(count < 99){
            System.out.print(" ");
        }else if(count < 9){
            System.out.print(" ");
        }
        System.out.print(++count + " ");
        for (int i = 0; i < size; i++) {
            System.out.print(arrChar[i]);
        }
        System.out.print("  ");
        System.out.flush();
        if(count%6 == 0){
            System.out.println("");
        }
    }

    private static String getString() throws IOException {
        InputStreamReader inputStreamReader = new InputStreamReader(System.in);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        return bufferedReader.readLine();
    }

    public static void main(String[] args) throws IOException{

        System.out.println("Enter a word:");
        String input = getString();
        size = input.length();
        count = 0;
        for (int i = 0; i < size; i++){
            arrChar[i] = input.charAt(i);
        }
        doAnagram(size);
    }