StringBuffer 실습

public classStringBufferEx {

 

           /**

            * @paramargs

            */

           public static voidmain(String[] args) {

                     // TODOAuto-generated method stub

//                  String/ StringBuffer

//                  String- 내부에 담긴 문자열 변형이 불가 / 불변성

//                  StringBuffer- 내부 문자열 변형 가능

                    

                     StringBuffersb1 = newStringBuffer();

                     StringBuffersb2 = newStringBuffer("Hello");

                    

                     System.out.println("문자열의 길이 :" + sb2.length());

                    

                     sb2.append("/ 안녕");

                    

                     System.out.println(sb2);

                    

                     // 중간에 문자열 삽입하기

                     sb2.insert(6,"world");

                     System.out.println(sb2);

                    

                     // 중간에 문자열 삭제하기

                     sb2.delete(6,13);

                     System.out.println(sb2);

                    

                     // 형 변환

                     Stringstr = sb2.toString();

                     System.out.println(str);

           }

 

} 

 

 

 

문자열의 길이 : 5
Hello / 안녕
Hello world/ 안녕
Hello 안녕
Hello 안녕