[Java] Array 실습 (length)

Array 실습 (length)

public static void main(String[] args) {
	int[] oldNum = {1, 2, 3, 4, 5};
	int[] newNum = new int[10];
		
	for(int i = 0; i < oldNum.length; i++) {
		newNum[i] = oldNum[i];
	}
	for(int i = 0; i < newNum.length; i ++) {
		System.out.print(newNum[i] + ", ");
	}

}

실행 결과

1, 2, 3, 4, 5, 0, 0, 0, 0, 0,

 

public static void main(String[] args) {

	char[] abc = {'A', 'B', 'C', 'D'}; // abc.length
	char[] num = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}; // num.length
		
	char[] result = new char[abc.length+num.length];
	System.arraycopy(abc, 0, result, 0, abc.length);
	System.arraycopy(num, 0, result, abc.length, num.length);
	System.out.println(new String(result));
		
	System.arraycopy(abc, 0, num, 0, abc.length);
	System.out.println(new String(num));
}

실행 결과

ABCD0123456789
ABCD456789