你应该看看StringBuilder/StringBuffer，它允许你删除，插入，替换指定偏移量的字符。

你可以轻松地使用String.replace():

String helloWorld = "Hello World!";
String hellWrld = helloWorld.replace("o","");

下面是从给定字符串中删除所有子字符串的实现

public static String deleteAll(String str, String pattern)
{
    for(int index = isSubstring(str, pattern); index != -1; index = isSubstring(str, pattern))
        str = deleteSubstring(str, pattern, index);

    return str;
}

public static String deleteSubstring(String str, String pattern, int index)
{
    int start_index = index;
    int end_index = start_index + pattern.length() - 1;
    int dest_index = 0;
    char[] result = new char[str.length()];


    for(int i = 0; i< str.length() - 1; i++)
        if(i < start_index || i > end_index)
            result[dest_index++] = str.charAt(i);

    return new String(result, 0, dest_index + 1);
}

isSubstring()方法的实现在这里

除了@DwB answer，你还可以使用StringUtils remove:

String hello = "hello world";
String hellYeah = StringUtils.remove(hello, "o");

或removeIgnoreCase:

String hello = "hellO world";
String hellYeah = StringUtils.remove(hello, "o");

如果你知道开始和结束索引，你可以使用它

string = string.substring(0, start_index) + string.substring(end_index, string.length());

replaceAll(String regex, String replacement)

以上方法将帮助你得到答案。

String check = "Hello World";
check = check.replaceAll("o","");