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How to get username of system current user?

This example show you how to get operating system active user's login name. We can obtain the username of current user by reading system properties using the user.name key.

package com.javacoderanch.example.lang;

public class GettingUserName {
    public static void main(String[] args) {
        String username = System.getProperty("user.name");
        System.out.println("username = " + username);
    }
}