「Java学习打卡」 13、删除一个字符串中的指定字母

删除一个字符串中的指定字母，如：字符串 “aca”，删除其中的 a 字母。

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        System.out.print("请输入要截取的字符：");
        Scanner scan = new Scanner(System.in);
        String str=scan.nextLine();
        char[] s = str.toCharArray();
        System.out.print("请输入字符串：");
        Scanner scan1 = new Scanner(System.in);
        String str1=scan1.nextLine();
        char[] s2 = str1.toCharArray();
        deleteCharacters(s2, s);
        return;
    }

    public static void deleteCharacters(char[] str, char[] charSet) {
        int[] hash = new int[256];
        if (charSet == null || charSet.length == 0) {
            System.out.print(str);
            return;
        }
        for (int i = 0; i < 256; i++) 
            hash[i] = 0;
        for (int i = 0; i < charSet.length; i++)
            hash[charSet[i]] = 1;
        int currentIndex = 0;
        for (int i = 0; i < str.length; i++) {
            if (hash[str[i]] == 0)
                str[currentIndex++] = str[i];
        }
        for(int i=0;i<currentIndex;i++){
            System.out.print(str[i]+" ");
        }
        return;
    }
}