StringBuffer的常用方法
//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--indexOfpublic 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");}}}