If statement &引用；如果；不'；“我不能和”一起工作；keyboard.nextLine（）；

我必须写正确的密码，如果密码正确，就说“密码正确”

当我写正确的密码时，它会说它不正确

她是我的密码：

import java.util.Scanner;
class  myclass
{
public static void main(String args[]) 
{
Scanner keyboard = new Scanner(System.in);
String name;
String password;

System.out.println("give your name:\t");
name=keyboard.nextLine();
System.out.println("Hello"+name);
System.out.println("give your password:\t");
password=keyboard.nextLine();
keyboard.close();

if (password=="www")
{
    System.out.println();
    System.out.println("password is correct") ;
}
else 
{
    System.out.println();
    System.out.println("password isn't correct");        

}




}
}   

---

您必须使用equals方法而不是==方法，这样它才能工作。 看起来是这样的：

import java.util.Scanner;

class myclass {
    public static void main(String args[]) {
        Scanner keyboard = new Scanner(System.in);
        String name;
        String password;

        System.out.println("give your name:\t");
        name = keyboard.nextLine();
        System.out.println("Hello" + name);
        System.out.println("give your password:\t");
        password = keyboard.nextLine();
        keyboard.close();

        if (password.equals( "www")) {
            System.out.println();
            System.out.println("password is correct");
        } else {
            System.out.println();
            System.out.println("password isn't correct");

        }

    }
}

输出：

give your name: 
name
Helloname
give your password: 
www

password is correct

---

您不应该使用

=

运算符比较

字符串。您应该使用
equals
方法来比较字符串对象。e、 g.
“www.equals（密码）