[ Java ] 배열

변수 선언: 타입[] 변수명

int[] myNum = {10, 20, 30, 40};
String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};

System.out.println(cars[0]); // Outputs Volvo

cars[0] = "Opel";
System.out.println(cars[0]); // Now outputs Opel instead of Volvo

System.out.println(cars.length); // Outputs 4

 

배열과 for문

String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};

// 1번
for (int i = 0; i < cars.length; i++) {
  System.out.println(cars[i]);
}

// 2번
for (String i : cars) {
  System.out.println(i);
}

 

다차원 배열

int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };
System.out.println(myNumbers[1][2]); // Outputs 7

// -------------------------
int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };
myNumbers[1][2] = 9;
System.out.println(myNumbers[1][2]); // Outputs 9 instead of 7

// -------------------------
public class Main {
  public static void main(String[] args) {
    int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };
    for (int i = 0; i < myNumbers.length; ++i) {
      for(int j = 0; j < myNumbers[i].length; ++j) {
        System.out.println(myNumbers[i][j]);
      }
    }
  }
}