StringÖвéѯÖظ´×Ö·û

@Test
public void test1() {
    String str = "aaaaddaaddababacaxaxcccaswfdsfasgdfah";
    //°ÑSIZEÌáÇ°È¡³ö£¬ÃâµÃÔÚÑ­»·ÖÐÿ´Î¶¼µÃÈ¡
    int charSize = str.length();
    Set<Object> rSet = new HashSet<>();
    for (int j = 1; j <= charSize; j++) {
        for (int i = 0; i < charSize; i++) {
            String strE2 = null;
            if (i < charSize - j) {
                //½ØÈ¡µÄ²¨¶¯Çø¼äΪ£¨1¡«SIZE-1£©
                strE2 = str.substring(i, i + j);
                System.out.println( "---" + strE2 + "---" );
                //ÕýÏò²éÕÒ£¬·´Ïò²éÕÒ£¬Èç¹ûÄܲ鵽Ôò·µ»Ø¶ÔÓ¦µÄλÖÃ
                //ÒòΪÊÇ´ÓstrÖнØÈ¡µÄstrE2£¬ËùÒÔ²»»áÓÐindexOf£¨£©==-1µÄÇé¿ö
                int indexS = str.indexOf(strE2);
                int indexE = str.lastIndexOf(strE2);
                    if(indexS != indexE){
                        //ʹÓÃSetµÄÌØÐÔ¹ýÂ˲¢±£´æÖظ´µÄÖµ
                        rSet.add(strE2);
                    }
                }
            }
        }
        System.out.println(rSet);
    }