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例子

例如输入字符串abc，则输出由字符a、b、c所能排列出来的所有字符串abc、acb、bac、bca、cab和cba。

public void sort(List
   
     oldChars, int k, List
    
      res) {        if (k == oldChars.size() - 1){//输出这个排列            String resTemp = "";            for (int i = 0; i < oldChars.size(); i++) {                System.out.print(oldChars.get(i) + " ");                resTemp += oldChars.get(i);                }            res.add(resTemp);            System.out.println();          }        for (int i = k; i < oldChars.size(); i++) {            System.out.println("走进for循环中 i=" + i);            Character temp = oldChars.get(i);            oldChars.set(i, oldChars.get(k));            oldChars.set(k, temp);            sort(oldChars, k+1, res);            //再换回来            Character temp1 = oldChars.get(i);            oldChars.set(i, oldChars.get(k));            oldChars.set(k, temp1);        }    }
    
   

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