Java: Check whether a security manager has already been established for the current application or not

Last update on May 12 2025 13:11:31 (UTC/GMT +8 hours)

Check Security Manager

Write a Java program to check whether a security manager has already been established for the current application or not.

Sample Solution:

Java Code:

import java.lang.*;

public class Exercise89 {
    public static void main(String[] args) {
        // Print a message indicating the display of the system security interface
        System.out.println("System security interface:");

        // Retrieve and print the system security manager using System.getSecurityManager()
        System.out.println(System.getSecurityManager());
    }
}

Sample Output:

System security interface:                                             
null

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to install a custom security manager and prevent file access operations.
• Write a Java program to check if a security manager is active, and if so, attempt to disable it (if allowed).
• Write a Java program to restrict execution of System.exit() using a security manager.
• Write a Java program to log all permission checks made by the security manager.

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