Java
StringBuilder
常用API1:java.lang.StringBuilder的append()方法，这最常用。就不多说常用API2:在new StringBuilder时添加内容。这个API可以 让代码更简洁
常用API3:java.lang.StringBuilder的substring可以很方便的对字符串进行截取
常用API4:java.lang.StringBuilder的delete可以方便的字符串进行修正
常用API4:java.lang.StringBuilder的deleteCharAt可以方便的字符串进行修正
示例代码：package chapter1;/** * Created by MyWorld on 2016/3/10. */public class StringBuilderSubStringDemo { public static void main(String[] args) { StringBuilder sql = new StringBuilder('select * from staff where burnMonth in ('); sql.append(getInCondition()); sql.append(')'); System.out.println(sql); } private static String getInCondition() { StringBuilder sql = new StringBuilder(); for (int i = 0; i < 10; i++) { sql.append(',') .append(i); } return sql.substring(1); }}
执行结果：select * from staff where burnMonth in (0,1,2,3,4,5,6,7,8,9)