String.replace()方法

String  str = "11qqqq11qqqqq11qqqqq11qqwqweee";
String replacedResult = str.replace("11","22");
System.out.println("replacedResult =" + replacedResult);




replacedResult =22qqqq22qqqqq22qqqqq22qqwqweee

replace（）方法：会替换掉字符中的所有匹配到的字符串

replaceall(regex,replaceWords) //替换被正则匹配到的所有的子字符串

replacefirst(regex,replaceWords) //替换被正则匹配到的第一个子字符串