public?void?testSortRandomString(){
????List<String>?list?=?new?ArrayList<String>();
????Integer?k;
????Random?random?=?new?Random();
????String?str?=?"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
????StringBuilder?stringBuilder?=?new?StringBuilder();
????for?(int?i?=?0;?i?<?3;?i++)?{
????????do?{
????????????for?(int?a?=?0;?a?<?10;?a++)?{
????????????????k?=?random.nextInt(str.length());
????????????????stringBuilder.append(str.charAt(k));
????????????}
????????}while?(list.contains(stringBuilder));
????????System.out.println(stringBuilder);
????????list.add(stringBuilder.toString());
????????stringBuilder.delete(0,stringBuilder.length());
????}
????Collections.sort(list);
????System.out.println("===========排序后=============");
????for?(String?i:list)?{
????????System.out.println("元素："+i);
????}
}
2019-07-27
public void testSortString2() {
List<String> stringList = new ArrayList<String>();
Integer it;
Random random = new Random();
Random Long = new Random();
String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
StringBuilder sb = new StringBuilder();
for(int i = 0 ; i < 10 ; i++) {
do {
for (int j = 0 ,l=Long.nextInt(10);j<l; j++) {
it = random.nextInt(str.length());
sb.append(str.charAt(it));
}
}while(stringList.contains(sb));
stringList.add(sb.toString());
sb.delete(0, sb.length());
}
System.out.println("---------");
for(String s : stringList) {
System.out.println("元素:"+ s);
}
Collections.sort(stringList);
System.out.println("---------");
for(String s : stringList) {
System.out.println("元素:"+ s);
}
}
改了一下 可以不固定10個字符?