CodePudding user response:

Because you have 2 next if the judgment of the conditions (), suggest to have a look at the first Scanner class API and come back to your code,

CodePudding user response:

Using a flow, can reuse, it is not necessary to enter a create a stream object

CodePudding user response:

And you should receive variable with the input data rather than in the if input twice again

CodePudding user response:

 
System. Out.println ("?" ); 
System. Out. Println (" Y/N "); 
Scanner input=new Scanner (System. In);//advice to have a look at the Scanner API manual 
String choose=input. NextLine (); 
If (" Y ". The equals (choose toUpperCase ())) {//it is best to use when using the equals constant. Equals, can avoid NullPointerException 
System. The out. Println (" name "); 
String name=input. NextLine (); 
System. The out. Println (" hello, "+ name +" password "); 
String=input PSD. NextLine ();//as far as possible don't use next (), if you have 12, 345, the program was over 
If (PSD) length ()==6) {
System. The out. Println (" again "); 
If (PSD) equals (input nextLine ())) {
System. The out. Println (" success "); 
} else {
System. The out. Println (" fail "); 
} 
} 

} 
Input. The close (); 

CodePudding user response:

A child into the pit again