Java String类型的二进制求反码与补码

1. String类型的二进制(原码)--->反码

public static String InvertedCode(String  s){
        StringBuilder sr = new StringBuilder(s);
        for (int i = 0; i < sr.length(); i++) {
            if (sr.substring(i,i+1).equals("0")){
                sr.replace(i,i+1,"1");
            }else{
                sr.replace(i,i+1,"0");
            }
        }
        return sr.toString();
    }

2.String类型的二进制(反码)--->补码

public static String Complement(String st) {
        StringBuilder sr = new StringBuilder(st);
        if (st.substring(st.length() - 1).equals("0")) {
            sr.replace(st.length() - 1, st.length(), "1");
            return sr.toString();
        } else {
            sr.replace(st.length() - 1, st.length(), "0");
            for (int i = st.length() - 1; i > 0; i--) {
                if (st.substring(i - 1, i).equals("0")) {
                    sr.replace(i - 1, i, "1");
                    return sr.toString();
                } else {
                    sr.replace(i - 1, i, "0");
                }
            }
            return sr.toString();

        }

    }