StringBuffer的常用方法

[java] 
//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"); 
        } 
    } 
} 

补充：软件开发 , Java ,