When I input in in a "1 2" format it gives error if in "1 enter 2" It gives error

I'm tasked to create a lambda that has a function that deals with knowing what the user input is. The user would chose to determine either odd, even, prime, composite or palindrome. But I cant use this as a reference as it doesn't give any instruction on how to use it.

The first one gives

```
Exception in thread "main" java.lang.NumberFormatException: For input string: "4 1"
at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)
at java.base/java.lang.Integer.parseInt(Integer.java:652)
at java.base/java.lang.Integer.parseInt(Integer.java:770)
at Lambda_Project/Project.Solution.main(Solution.java:45)
```

The second one is

```
Exception in thread "main" java.util.NoSuchElementException
at java.base/java.util.StringTokenizer.nextToken(StringTokenizer.java:348)
at Lambda_Project/Project.Solution.main(Solution.java:53)
```

Im still a 2nd year student so please go easy on me

Here's the Code ...

```
import java.io.*;
import java.util.*;
interface PerformOperation {
boolean check(int a);
}
class MyMath {
public boolean checker(PerformOperation p, int num) {
return p.check(num);
}
public PerformOperation is_odd() {
return n -> (n & 1) == 1;
}
public PerformOperation is_prime() {
// O(n^(1/2)) runtime
return n -> {
if (n < 2) {
return false;
}
int sqrt = (int) Math.sqrt(n);
for (int i = 2; i <= sqrt; i++) {
if (n % i == 0) {
return false;
}
}
return true;
};
}
public PerformOperation is_palindrome() {
return n -> {
String original = Integer.toString(n);
String reversed = new StringBuilder(Integer.toString(n)).reverse().toString();
return original.equals(reversed);
};
}
}
public class Solution {
public static void main(String[] args) throws IOException {
MyMath ob = new MyMath();
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int T = Integer.parseInt(br.readLine()); // IT ERRORS HERE
PerformOperation op;
boolean ret = false;
String ans = null;
while (T--> 0) {
String s = br.readLine().trim();
StringTokenizer st = new StringTokenizer(s);
int ch = Integer.parseInt(st.nextToken());
int num = Integer.parseInt(st.nextToken()); // AND HERE
if (ch == 1) {
op = ob.is_odd();
ret = ob.checker(op, num);
ans = (ret) ? "ODD" : "EVEN";
} else if (ch == 2) {
op = ob.is_prime();
ret = ob.checker(op, num);
ans = (ret) ? "PRIME" : "COMPOSITE";
} else if (ch == 3) {
op = ob.is_palindrome();
ret = ob.checker(op, num);
ans = (ret) ? "PALINDROME" : "NOT PALINDROME";
}
System.out.println(ans);
}
}
}
```

Read more here: https://stackoverflow.com/questions/64397322/this-is-a-example-code-of-my-prof-to-use-as-a-reference-for-our-project-but-i-do

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