如何使用java从长字符串中删除特定的字符串值？

String longString = "This is a long string with abc in it.";
String specificString = "abc";
String result = longString.replace(specificString, "");

String longString = "This is a long string with 123 numbers in it.";
String pattern = "\\d+"; // 正则表达式匹配数字
String result = longString.replaceAll(pattern, "");

String longString = "This is a long string with spaces.";
String specificString = " ";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < longString.length(); i++) {
    if (!longString.substring(i, i + 1).equals(specificString)) {
        sb.append(longString.charAt(i));
    }
}
String result = sb.toString();