StringBuffer的常用方法

摘自：http://blog.csdn.net/deaful/article/details/8096968  

//通过append()方法连接各种类型的数据 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello \n");
            buf.append("Hello ").append("World!\n");
            buf.append("数字：").append(1).append("\n");//代码链
            buf.append("布尔：").append(true);
            System.out.println(buf);
        }
    }*/ 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello ");
            fun(buf);
            System.out.println(buf);
        }
        public static void fun(StringBuffer s){
            s.append("MLDN ").append("LiXingHua");
        }
    }*/ 
    //Hello MLDN LiXingHua 
     
    //直接使用insert()方法在指定位置上为StringBuffer添加内容 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello!!!");
            buf.insert(0,"Hello ");
            System.out.println(buf);
            buf.insert(buf.length()," MLDN~~");
            System.out.println(buf);
        }
    }*/ 
     
    //字符串反转操作--reverse 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("World!!!");
            buf.insert(0,"Hello ");
            String str = buf.reverse().toString();
            System.out.println(str);
        }
    }*/ 
     
    //替换指定范围的内容--replace 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello ").append("World!!");
            buf.replace(6,11,"LiXiHua");
            System.out.println(buf);
        }
    }*/ 
     
    //字符串截取--substring 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello ").append("World!!");
            buf.replace(6,11,"LiXiHua");
            String str = buf.substring(6,15);
            System.out.println(str);
        }
    }*/ 
     
    //删除指定范围的字符串--delete 
    /*public class Append{
        public static void main(String []args){
            StringBuffer buf = new StringBuffer();
            buf.append("Hello ").append("World!!");
            buf.replace(6,11,"LiXiHua");
            String str = buf.delete(6,15).toString();
            System.out.println(str);
        }
    }*/ 
     
    //查找指定的内容是否存在--indexOf 
    public class Append{ 
        public static void main(String []args){ 
            StringBuffer buf = new StringBuffer(); 
            buf.append("Hello ").append("World!!"); 
            if(buf.indexOf("Hello")==-1){ 
                System.out.println("没有找到指定内容"); 
            }else{ 
                System.out.println("可以找到指定内容"); 
            } 
        } 
    }