Problem with the scope of [JAVA] variables

Variable | problem
Problem with variable scope: public string Getanswer () {string myanswer;      try {BufferedReader bfreader=new BufferedReader (New InputStreamReader (system.in));   Myanswer=new String (Bfreader.readline (). toString ());      System.out.println ("You enter is:" +myanswer);   catch (Exception e) {} return myanswer; } }

This method is always an error, according to the previous thinking, Myanawer should have been assigned, how can it be not yet assigned value?

It turns out that this is the scope of the variable, and I'll change it to:

public string Getanswer () {string Myanswer=new string (""); Note Here/* Summary: A variable defined within an area must be new in this area, like this method, you cannot use String myanswer, and then the next layer of parentheses new*/try {bufferedreader bfreader=new Buf   Feredreader (New InputStreamReader (system.in));   Myanswer=bfreader.readline (). toString ();      System.out.println ("You enter is:" +myanswer);   catch (Exception e) {}//system.out.println (myanswer); return myanswer; }

Because the scope of the variable cannot jump out of the pair of braces that it allocates space for.

Of course, you can also use string myanswer to jump out of the body of the method directly as a variable in the class, and you can also work with this variable directly in the method. Such as

String Myanswer; Public String GetAnswer2 () {try {BufferedReader bfreader=new BufferedReader (New InputStreamReader (system.in       ));    Myanswer=new String (Bfreader.readline (). toString ());       System.out.println ("You enter is:" +myanswer);     catch (Exception e) {} return myanswer; }