问题描述
一个非常简单的登录系统是我想到的使用Java条件语句的更好方法之一。 我要做的就是比较两个字符串变量,看来在此过程中出了点问题。它总是只会出现在最后的“ else”语句中,并且我已经进行了很多故障排除,结果表明在出现条件时,用户名和密码实际上是相同的。
以下是代码:
import java.util.Scanner;
public class HelloWorld {
// Pre-defined username and password requirements
String requiredUsername = "test";
String requiredPassword = "test";
// Initializes the textinput
Scanner input = new Scanner(system.in);
public static void main(String[] args) {
// Creates a new "object" of the main program called loginpage
HelloWorld logingpage = new HelloWorld();
// Starts the "start" method
logingpage.start();
}
public void start() {
// // Main Screen in console
// System.out.println("+-----------------------------------------------+"
// + "| |"
// + "| Welcome to the Login Screen |"
// + "| |"
// + "+-----------------------------------------------+");
// Prompts the user for a username and gathers it
System.out.print("[*] Please enter Username\n>>> ");
String username = input.nextLine();
System.out.println("");
// Prompts the user for a password and gathers it
System.out.print("[*] Please enter Password\n>>> ");
String password = input.next();
System.out.println("");
// Conditionals to check username and password
if (username == requiredUsername && password == requiredPassword) {
System.out.println("[*] The secret message is: The eagle has landed!");
} else if (username == requiredUsername && password != requiredPassword) {
System.out.println("[*] ERROR,Password Not Valid");
} else if (username != requiredUsername && password == requiredPassword) {
System.out.println("[*] ERROR,Username Not Valid");
} else {
System.out.println("[*] ERROR,All Credentials Invalid");
}
// input.close();
}
}
解决方法
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