배열생성

 

int[] a =  new int[3];

            

            int[] b;

            b = new int[3];

            

            //선언된 변수가 배열변수가 아니다

            //int c;

            //c = new int[3]; // error

            

            //배열만들기

            ArrayList<String> tmpAry = new ArrayList<>();

            

            //배열입력

            tmpAry.add("aaa");

            tmpAry.add("bbb");

            

            //출력

            System.out.println(tmpAry); //배열출력

            System.out.println(tmpAry.get(1)); //원하는 위치의 배열값출력

            System.out.println(tmpAry.indexOf("bb")); //해당값을 가지고잇는 index출력

            

            

            tmpAry.forEach(idx -> System.out.println(idx)); // 반복문으로 한개 씩 출력

            

            //arraylist to array

            String[] tmpArys = new String[tmpAry.size()];

            int cnt = 0;

            for(String tmp : tmpAry)

            {

                  tmpArys[cnt++] = tmp;

            }

            

            System.out.println(Arrays.toString(tmpArys));