javaAPI(2)之StringBuffer类

public class APITestOne {    public static void main(String[] args){        StringBuffer sc=new StringBuffer();        System.out.println("增加一段字符串:"+sc.append("Hello!"));        System.out.println("在指定下标增加字符串:"+sc.insert(2, "|hello"));        System.out.println("在指定位置移除字符串:"+sc.delete(2, 8));        System.out.println("替换指定位置的字符串："+sc.replace(2, 4, "he"));        sc.setCharAt(3,'c');        System.out.println("修改指定位置的字符序列："+sc);        String str=sc.toString();        System.out.println("返回字符容器的字符串："+str);        System.out.println("字符反转序列："+sc.reverse());    }}