String 常用API

public static void main(String[] args) { /** * String 常用API * 字符串 * 1>截取 * 2>替换 * */ String fileSuffix = ".jpg"; int i = fileSuffix.indexOf("."); //截取.之后的内容，包含. indexs+0 String newStr = fileSuffix.substring(i+ 0); //截取.之后的内容，不包含. indexs+1 String newStr2 = fileSuffix.substring(i + 1); System.out.println("包含. :"+newStr); System.out.println("不包含. :"+newStr2); String separator = "webapps\\com\\gblfy"; System.out.println("将.替换为@ :"+fileSuffix.replace(".","@")); System.out.println("将双\\替换为单/ :"+separator.replace("\\","/")); }