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Java System class getSecurityManager() method with example

System class getSecurityManager() method: Here, we are going to learn about the getSecurityManager() method of System class with its syntax and example.
Submitted by Preeti Jain, on September 14, 2019

System class getSecurityManager() method

• getSecurityManager() method is available in java.lang package.
• getSecurityManager() method is used to return the security manager if exists else it returns null if the security manager couldn't establish for the current application.
• getSecurityManager() method is a static method so this method is accessible with the class name too.
• The return type of this method is SecurityManager so it returns the security manager only when a security manager is currently established for the current interface and it returns null when a security manager is not establishing for the current application.
• getSecurityManager() method does not throw any exception.

Syntax:

    public static SecurityManager getSecurityManager();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is SecurityManager, it returns the security manager only when a security manager is currently established for the current interface and it returns null when the security manager is not establishing for the current application.

Example:

// Java program to demonstrate the example of
// getSecurityManager () method of System Class

import java.lang.*;

public class GetSecurityManagerMethod {
    public static void main(String[] args) {

        SecurityManager smgr = System.getSecurityManager();

        if (smgr != null) {
            smgr.checkExit(0);
        } else {

            System.out.println("Security manager is null");
        }

    }
}

Output

E:\Programs>javac GetSecurityManagerMethod.java
E:\Programs>java GetSecurityManagerMethod
Security manager is null