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Introduction To Java
JAVA was developed by James Gosling at Sun Microsystems Inc in the year 1991, later acquired by Oracle Corporation. It is a simple programming language. Java makes writing, compiling, and debugging programming easy. It helps to create reusable code and modular programs.
Java is a class-based, object-oriented programming language and is designed to have as few implementation dependencies as possible. A general-purpose programming language made for developers to write once run anywhere that is compiled Java code can run on all platforms that support Java. Java applications are compiled to byte code that can run on any Java Virtual Machine. The syntax of Java is similar to c/c++.
Link for the Problem – Can You Access – Hacker Rank Solution
Can You Access – Hacker Rank Solution
Objective
You are given a class Solution and an inner class Inner.Private. The main method of class Solution takes an integer num as input. The powerof2 in class Inner.Private checks whether a number is a power of 2 . You have to call the method powerof2 of the class Inner.Private from the main method of the class Solution.
Constraints
1<=num<=2power30
Sample Input
8
Sample Output
8 is power of 2 An instance of class: Solution.Inner.Private has been created
Can You Access – Hacker Rank Solution
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.security.Permission;
public class Solution {
public static void main(String[] args) throws Exception {
Do_Not_Terminate.forbidExit();
try {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int num = Integer.parseInt(br.readLine().trim());
Object o;// Must be used to hold the reference of the instance of
// the class Solution.Inner.Private
Inner inner = new Inner();
Inner.Private p = inner.new Private();
System.out.println(num + " is " + p.powerof2(num));
o = p;
System.out.println("An instance of class: " + o.getClass().getCanonicalName() + " has been created");
} // end of try
catch (Do_Not_Terminate.ExitTrappedException e) {
System.out.println("Unsuccessful Termination!!");
}
}// end of main
static class Inner {
private class Private {
private String powerof2(int num) {
return ((num & num - 1) == 0) ? "power of 2" : "not a power of 2";
}
}
}// end of Inner
}// end of Solution
class Do_Not_Terminate {
public static class ExitTrappedException extends SecurityException {
private static final long serialVersionUID = 1L;
}
public static void forbidExit() {
final SecurityManager securityManager = new SecurityManager() {
@Override
public void checkPermission(Permission permission) {
if (permission.getName().contains("exitVM")) {
throw new ExitTrappedException();
}
}
};
System.setSecurityManager(securityManager);
}
}
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