要将字符串中的子串<head>替换成<h1>，用replaceall函数怎么写参数？
麻烦了
------解决方案--------------------
replaceAll("<head>","<h1>");
------解决方案--------------------
String head="<head>head</head><head>第四代</head>";
System.out.println(head.replaceAll("(</?)head(>)", "$1h1$2"));
System.out.println(head.replaceAll("<head>", "<h1>").replaceAll("</head>", "</h1>"));