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42 lines (31 loc) · 1.03 KB
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package collection.array;
import java.util.Arrays;
public class ArrayMain1 {
public static void main(String[] args) {
int[] arr = new int[5];
//index 입력 : O(1)
System.out.println("==index 입력 : O(1)==");
arr[0] = 1;
arr[1] = 2;
arr[2] = 3;
System.out.println(Arrays.toString(arr));
//index 변경 : O(1)
System.out.println("==index 변경 : O(1)==");
arr[2] = 10;
System.out.println(Arrays.toString(arr));
//index 조회 : O(1)
System.out.println("==index 조회 : O(1)==");
System.out.println("arr[2] = " + arr[2]);
//검색 : O(n)
System.out.println("== 배열 검색 : O(n)");
System.out.println(Arrays.toString(arr));
int value = 10;
for (int i = 0; i < arr.length; i++) {
System.out.println("arr [" + i + "] : " + arr[i]);
if(arr[i] == value){
System.out.println( value + " 찾음");
break;
}
}
}
}