The finally Block Always Runs

easy Exception Handling

Read an integer n. Print the trace of a try / catch / finally block, one word per line. First print try. If n is negative the block throws an error: print error. Otherwise print ok. At the end always print finally.

Constraints

-10^9 <= n <= 10^9

Examples

Input

-1

Output

try
error
finally

Input

Output

try
ok
finally

try-catch-finally
Control flow

Solutions

Best approachTime O(1)Space O(1)

finally is used to release resources (files, connections) even when an error happens. In Java, try-with-resources does this automatically for AutoCloseable objects.

Same code works in Java810172125Basic features only, so nothing changes between versions.

/*
 * Problem : Trace.
 * Input   : One integer n.
 * Output  : Three or four words.
 * Approach: try / catch / finally.
 * Time    : O(1)
 * Space   : O(1)
 * Java    : 8 or newer.
 */
import java.util.Scanner;

public class Main {
    // This method solves the task. It receives the input and returns the answer.
    static String[] solve(long n) {
        java.util.List<String> trace = new java.util.ArrayList<>();
        try {
            // Step 1: The try block runs first.
            trace.add("try");
            if (n < 0) {
                throw new IllegalArgumentException("negative");
            }
            trace.add("ok");
        } catch (IllegalArgumentException error) {
            // Step 2: The catch block runs only if an error was thrown.
            trace.add("error");
        } finally {
            // Step 3: The finally block runs in every case, with or without an error.
            trace.add("finally");
        }
        return trace.toArray(new String[0]);
    }

    public static void main(String[] args) {
        long n = new Scanner(System.in).nextLong();
        System.out.println(String.join("\n", solve(n)));
    }
}

Hints (1)

When does finally not run?