Java Sixth time job

class check{ publicBooleanValidate (String name,string password) {if(Name.equals ("Huangjiashuai") &&password.equals ("HJS"))){   return true; }Else{   return false; }}}class operate{private string info[]; public Operate (String info[]) { This. info=info;} Public String Login () {check check=NewCheck ();  This. Isexit (); String name= This. info[0]; String Password= This. info[1]; String Str=NULL; if(check.validate (name, password)) {str= "Welcome" +name+ "Visit!" "; }Else{str= "Wrong user name and password!" "; }  returnstr;} PublicvoidIsexit () {if( This. info.length!=2) {System.out.println ("The input parameters are incorrect and the system exits!" "); System.out.println ("Format: Java LoginDemo02 user name password"); System.exit (1); }}}public class logindemo02{public staticvoidMain (String args[]) {Operate oper=NewOperate (args); System.out.println (Oper.login ()); }}

Java Sixth time job