字符串:字符串“6sabcsssfsfs33”,掉字符“ab3”

public class GoodCode {
//假如有字符串“6sabcsssfsfs33” ，
//用最有快速的方法去掉字符“ab3”，不能用java内置字符串方法（indeOf,substring,replaceAll等）？
public void isGood() {
String str = "6sabcsssfsfs33";
char c1 = 'a';
char c2 = 'b';
char c3 = '3';
char[] c = str.toCharArray();
StringBuilder sl = new StringBuilder();
for (char temp : c) {
if (temp != c1 && temp != c2 && temp != c3)
sl.append(temp);
}
System.out.println(sl.toString());
}
public static void main(String[] args) {
GoodCode g = new GoodCode();
g.isGood();
}
}
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