package test\x0d\x0aimport java.util.Scanner\x0d\x0apublic class TestLogin {\x0d\x0aprivate static final String USERNAME = "Tom"//此处定义
用户名\x0d\x0aprivate static final String PASSWORD = "123"//定义
密码\x0d\x0apublic static void main(String[] args) {\x0d\x0aScanner sc = new Scanner(System.in)\x0d\x0aSystem.out.print("
请输入您的用户名:")\x0d\x0aString username_in = sc.next()\x0d\x0aSystem.out.print("请输入您的密码:")\x0d\x0aString password_in = sc.next()\x0d\x0aif(username_in.equals(USERNAME) &&password_in.equals(PASSWORD)){\x0d\x0aSystem.out.println("登录成功")\x0d\x0a}else{\x0d\x0aSystem.out.println("用户名或密码错误")\x0d\x0a}\x0d\x0a}\x0d\x0a} \x0d\x0a这是从控制台输入的最简单的方法。import java.util.Scanner
public class LoginTest {
/**
* @param args
*/
public static void main(String[] args) {
String loginName = "admin"
String passWord = "123456"
Scanner sc = new Scanner(System.in)
boolean isSuccess = false
int index = 0
while(!isSuccess){
System.out.println("请输入用户名:")
String name = sc.nextLine() //读取字符串型输入
System.out.println("请输入密码:")
String passW = sc.nextLine()
if(loginName.equals(name)&&passWord.equals(passW)){
System.out.println("户名密码正确，退出程序")
isSuccess = true
}else{
if(++index>=3){
System.out.println("用户名密码错误，程序即将退出")
return
}else{
System.out.println("用户名密码错误，请重新输入")
}
}
}
}
}
