每一天，沉淀自己

关于String的错误用法：1，错误用法一：if (name == "") { //do something}2，错误用法二：if (name.equals("")) { //do something}3，错误用法三：if (！name.equals("")) { //do something}上述错误用法1是初...

public class StringBuilderDemo { public static void main(String[] args) throws Exception{ StringBuilder sb = new StringBuilder();//用来存读取的字符 BufferedReader in = new BufferedReader(new I...