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Test cases:

Java solution:

public class Program3 {
	public static void main(String[] args) {
		Program3.isDivisibleBy7(17);
		Program3.isDivisibleBy7(77);
		Program3.isDivisibleBy7(12);
	}
	
	public static boolean isDivisibleBy7(int num){
		if (num % 7 == 0) {
			return true;
		}
		return false;
	}
}

Javascript solution:

const isDivisibleBy7 = (num) => {
    if (num % 7 === 0) {
        return true;
    }
    return false;
}

console.log(isDivisibleBy7(17)); //false
console.log(isDivisibleBy7(77)); //true
console.log(isDivisibleBy7(12)); //false