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Checking variables one by one using if statement and while loop.

Hi, I know how to use a random genarator and input a random variable in an if statement within a while loop. Let say I have 20 variables and I want to check them against 1 variable in an if statement and repeat the same process 20 times using the while loop. I want the 20 variable to be checked from 1 to 20 not randomly.

18th May 2019, 10:51 PM
Sibusiso Mbambo
10 ответов
+ 6
String[] str = {some strings}; //you can fill the array like in the example with int just use next() or nextLine() --> str[i] = scan.next() or scan.nextLine(); String check = "test"; int i = 0; while(i < str.length){ if(str[i].equals(check){ //your action } i++; } If a string inside the array = your variable do something else continiue the loop and check the other Strings
19th May 2019, 12:38 AM
Denise Roßberg
Denise Roßberg - avatar
+ 4
Random rand = new Random(); int[] arr = new int[20]; for(int i = 0; i < arr.length; i++){ arr[i] = rand.nextInt(20) + 1; //number between 1 - 20 //or use Math.random() } Now you have a filled array and can use another for loop to do your stuff. //just an example for(int i = 0; i < arr.length; i++){ if(arr[i] < 10){ //some code } }
18th May 2019, 11:58 PM
Denise Roßberg
Denise Roßberg - avatar
+ 4
while loop: int i = 0; while(i < arr.length){ //your code i++; } edit: sorry I just read loop and array --> for loop ;) Same like example above: one loop to fill your array and one loop to do the rest
19th May 2019, 12:01 AM
Denise Roßberg
Denise Roßberg - avatar
+ 3
Emmanuel Mbambo Btw: the Scanner for user input has a hasNext() method. Scanner scan = new Scanner(System.in); int[] arr = new int[20]; int i = 0; while(scan.hasNext()){ arr[i] = scan.nextInt(); i++; } But you have to make sure that you don't add more values than 20. while(scan.hasNext() && i <= 20) is maybe better.
19th May 2019, 12:11 AM
Denise Roßberg
Denise Roßberg - avatar
+ 3
Emmanuel Mbambo Happy coding. :)
19th May 2019, 12:57 AM
Denise Roßberg
Denise Roßberg - avatar
+ 2
@Denise Roßberg thank you for your answer but I'm looking to use string variables not integers. Is it possible? I want to check each variable against one variable in an if statement, if it matches that variable I perform an action if not I use the while loop to go back and check again. So I'm not sure if I can use hasnext method to check string variable in a list.
19th May 2019, 12:22 AM
Sibusiso Mbambo
+ 1
why not put does values in an array, the variable is not important but the values
18th May 2019, 11:17 PM
✳AsterisK✳
✳AsterisK✳ - avatar
+ 1
sorry Emmanuel Mbambo i don't know java, that's just an idea, for you to use
18th May 2019, 11:22 PM
✳AsterisK✳
✳AsterisK✳ - avatar
+ 1
Thanks I'll try it.
19th May 2019, 12:43 AM
Sibusiso Mbambo
0
@*AsterisK* and then I can use hasnext method?
18th May 2019, 11:20 PM
Sibusiso Mbambo