Java 代码不允许我从一个类调用另一个类的方法

Question

嘿，抱歉，这是一个很长的问题，但我无法使用 pm.printPASSInfo() 将 printPASSInfo() 调用到另一个类。 pm 是我为我尝试调用的方法所在的类命名的名称。我可以很好地调用方法 pm.printSSNInfo 我不明白出了什么问题。很抱歉，这可能令人困惑且很长，但请尽力提供帮助。多谢你们!这是我的代码:

import java.util.Scanner; 

public class Prog1Methods_FA11 {
    String ssn, pw, phoneNumber,line;
    Scanner input = new Scanner (System.in);
    boolean validPW_Length = true, 
            validPW_Symbols = true, 
            validPW_enough_Digits = true;
    boolean validSSN_Digits = true, 
            validSSN_Format = true, 
            validSSN_Length = true;
    boolean validPhone_Symbols = true, 
            validPhone_Format = true, 
            validPhone_Length = true;

    public Prog1Methods_FA11() {

    }


    // you may insert a method here to display password status
    public void printPASSInfo(){
        System.out.println("\t Password Information");
        System.out.println("The Password:\t" + pw);
        System.out.println("Password Lrngth:\t" + validPW_Length);
        System.out.println("Password has minimum number of digits:\t" + validPW_enough_Digits);
        System.out.println("Password has correct symbols:\t" + validPW_Symbols);
    }

    // you may insert a method here to display the phone number status

}

这是我试图调用它的地方:

case 2:     System.out.println("Enter a password witha atleast 8 characters and atleast 2 numbers:\t");
                        pw = input.nextLine();
                        pm.readAndVerifyPASS(pw);
                        pm.printPASSInfo();
                        break;

和编译错误:

MySkeletonProgram1_FA11.java:53: cannot find symbol
symbol  : method printPASSInfo()
location: class Prog1Methods_FA11
                            pm.printPASSInfo();
                                                          ^
1 error

我在哪里声明 pm 对象:

public class MySkeletonProgram1_FA11{
  public static void main(String[] args)throws Exception {

// Declarations

Scanner scan = new Scanner(System.in);
Scanner input = new Scanner (System.in);
Prog1Methods_FA11 pm = new Prog1Methods_FA11();

Answer 1

我不确定我对你的问题的理解程度如何。 我只是尝试重现该错误。
所以，我做了什么。
1.文件MySkeletonProgram1_FA11.java

public class MySkeletonProgram1_FA11 {

public static void main(String[] args) throws Exception {
    Prog1Methods_FA11 pm = new Prog1Methods_FA11();
    pm.printPASSInfo();
}
}

2.文件Prog1Methods_FA11.java

import java.util.Scanner;

public class Prog1Methods_FA11 {

String ssn, pw, phoneNumber, line;
Scanner input = new Scanner(System.in);
boolean validPW_Length = true,
        validPW_Symbols = true,
        validPW_enough_Digits = true;
boolean validSSN_Digits = true,
        validSSN_Format = true,
        validSSN_Length = true;
boolean validPhone_Symbols = true,
        validPhone_Format = true,
        validPhone_Length = true;

public Prog1Methods_FA11() {
}

// you may insert a method here to display password status
public void printPASSInfo() {
    System.out.println("\t Password Information");
    System.out.println("The Password:\t" + pw);
    System.out.println("Password Lrngth:\t" + validPW_Length);
    System.out.println("Password has minimum number of digits:\t" + validPW_enough_Digits);
    System.out.println("Password has correct symbols:\t" + validPW_Symbols);
}
}

3.我已将这两个文件放在同一目录中。
4.编译命令

javac MySkeletonProgram1_FA11.java

编译成功完成，没有错误和警告。

这对你有用吗？如果答案是“否”，那么我认为这是你的 JDK 的问题。否则您可能需要提供更多详细信息。你做了什么不同的事情？