Scanner.close & Method execution

Purpose: 

1) Efficient CPU management with Scanner.

2) How to execute a method and the way of running it. 

1)

Once running a scanner, to prevent waste of memory loss in the CPU, we should close the scanner.

Formula : 

Scanner.close();

or

 sc. close();

   scanner random name 

2)

How to activate a method? Here is a way for it. 

Formula: 

Display(  );

But, some values need to be input inside (   ). 

String[ ][ ] menu = { { "EXIT", "프로그램을 종료합니다.~" }, 00, 01, 02

{ "MAIN", "연산하기", "끝내기" },  10, 11, 12

{ "연산", "새로운 연산", "이어서 연산", "이전 화면" } }; 20, 21, 22

this.display(this.makeSubMenu(menu[1]));

Menu is 2 dimetional array need a 2 cell to receive 2 dfferent value into [ ], [ ].

Once setting up an array with indexes inside together, we can summon the value with a formula like the above. 

without input value inside display, a method dose not work.