利用ASCII码索引数组，ascii索引数组,import java.

利用ASCII码索引数组，ascii索引数组,import java.

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class CareerCup1_1 {    public static boolean uniqueChar(String str) {        boolean ascii[] = new boolean[128];        boolean unique = true;        for (int i = 0; i < 128; ++i)            ascii[i] = false;        for (int i = 0; i < str.length(); ++i) {            if (ascii[str.charAt(i)] == true) {                unique = false;                break;            } else                ascii[str.charAt(i)] = true;        }        return unique;    }    public static void main(String[] args) {        InputStreamReader reader = new InputStreamReader(System.in);        BufferedReader bf = new BufferedReader(reader);        try {            String str = bf.readLine();            System.out.println("Is unique: " + uniqueChar(str));        } catch (IOException e) {            e.printStackTrace();        }    }}//该片段来自于http://byrx.net