public class Demo09_Array {
public static void main(String[] args) {
int[] arr = { 5, 9, 4, 88, 5 };
int index = getIndex(arr, 88);
System.out.println(index);
}

public static int getIndex(int[] arr, int value) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] == value) {
return i;
}
}
return -1;
}
}

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