Question

Java 无法解析变量？

小白自学，不知错在哪里请大神指教Exception in thread "main" java.lang.Error: Unresolved compilation problem: pw2 cannot be resolved to a variable源代码：import java.util.Scanner;public class Doc { String Psd = "0"; public static void main(String []args) { Scanner sc = new Scanner(System.in); Boolean Cheeking = true; Boolean Cheek2 = true; while(Cheeking) { System.out.println("请输入您的密码"); String Psd = sc.nextLine(); int Psdsize = Psd.length(); //密码字符数判断 if(Psdsize>=6 && Psdsize<=11) { Cheeking = false; }else if(Psdsize < 6) { System.out.println("Password is to short"); }else { System.out.println("Password is to long"); } //二次密码比对 do { System.out.println("请确认密码"); String pw2 = sc.nextLine(); if(!Psd.equals(pw2)){ System.out.println("Password set UNsuccessfully"); } }while(!Psd.equals(pw2)); } }}

Answer 1

pw2 为 do 代码块中的局部变量，你要把它提到外面来，才能在 while 中访问。即：
String pw2 = null;

do{
//....
pw2 = sc.nextLine();
//....
}while(!Psd.equals(pw2));

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