Linear Search

public class nine {
public static int linearSearch(int[] arr, int key){
for(int i=0;i< arr.length;i++){
if(arr[i] == key){
return i;
}
}
return -1;
}
public static void main(String a[]){
int[] a1= {10,20,30,50,70,90};
int key = 50;
System.out.println(key+" is found at index: "+linearSearch(a1,key));
}
}