Deep_Dev

๐Ÿ“– hasNextInt

Scanner์˜ ๊ธฐ๋ณธ ๋ฉ”์†Œ๋“œ

hasNextInt๋Š” Scanner์—์„œ ์ •์ˆ˜๋ฅผ ์ž…๋ ฅ๋ฐ›์€ ๊ฒฝ์šฐ true๋ฅผ, ์ •์ˆ˜๋ฅผ ์ž…๋ ฅ๋ฐ›์ง€ ์•Š์€ ๊ฒฝ์šฐ false๋ฅผ ๋ฐ˜ํ™˜ํ•˜๋Š” ๋ฉ”์†Œ๋“œ์ด๋‹ค.

 

๐Ÿ“Œ  ์˜ˆ์ œ 1

์ œ์ผ ๊ฐ„๋‹จํ•œ ์‚ฌ์šฉ ๋ฐฉ๋ฒ•

 

if ๋ฌธ์„ ์‚ฌ์šฉํ•ด์„œ ์•„๋ž˜์™€ ๊ฐ™์ด kb๊ฐ€ ์ •์ˆ˜๋กœ ๋„˜์–ด๊ฐ€๋Š”์ง€ ํ™•์ธ ํ›„ ์ •์ˆ˜๊ฐ€ ์•„๋‹ˆ๋ฉด "๊ฑฐ์ง“" ๋ฐ˜ํ™˜

// Scanner ๋ณ€์ˆ˜ ์„ ์–ธ
Scanner kb = new Scanner(System.in);

// if๋ฌธ์„ ์‚ฌ์šฉํ•ด์„œ ์ •์ˆ˜์ธ ๊ฒฝ์šฐ true์ด๋ฏ€๋กœ ์ฐธ์„ ์ถœ๋ ฅ, ์•„๋‹Œ ๊ฒฝ์šฐ false๋ฅผ ์ถœ๋ ฅ
if(kb.hasNextInt()) System.out.print("์ฐธ");
else System.out.print("๊ฑฐ์ง“");

 

 

๐Ÿ“Œ ์˜ˆ์ œ 2

while๋ฌธ์— ์กฐ๊ฑด์„ ๊ฑธ์–ด์„œ Scanner๊ฐ€ ์ •์ˆ˜๋กœ ๋„˜์–ด์˜ค์ง€ ์•Š๋Š” ๊ฒฝ์šฐ while๋ฌธ์„ ์ข…๋ฃŒํ•œ๋‹ค.

Scanner kb = new Scanner(System.in);

while(kb.hasNextInt())
{
	int a=kb.nextInt();
    int b=kb.nextInt();
    System.out.print(a+b);
}

 

 

 

๐Ÿ’ก ๋ฐฑ์ค€ ๋ฌธ์ œ ์‘์šฉ

๋ฐฑ์ค€ 1620๋ฒˆ ์ฐธ๊ณ  

 

// Scanner๋กœ ์ž…๋ ฅ๋œ ๊ฐ’์ด ์ •์ˆ˜์ผ๊ฒฝ์šฐ arr[์ž…๋ ฅ ๊ฐ’ -1] ๋ฐ˜ํ™˜ 
// ์ •์ˆ˜ ์ž…๋ ฅ์ด ์•„๋‹ ๊ฒฝ์šฐ map ์—์„œ ์ถœ๋ ฅ 

for(int i=0; i<m; i++){
    if(kb.hasNextInt()) System.out.println(arr[kb.nextInt()-1]);
    else System.out.println(map.get(kb.next()));
}