今天剛開始學習Java，所以請原諒我的業余錯誤。問題是它沒有顯示每個人最喜歡的顏色，而是顯示“null”，我有 Pawn 的編碼經驗，所以我猜我沒有正確創建字符串或者只是沒有以某種方式填充它。謝謝！我試過這些代碼，但我得到的是“null”，而不是每個人最喜歡的顏色。import java.io.*;public class Employee {   String name;   int age;   String designation;   String favoriteColor;   double salary;   // This is the constructor of the class Employee   public Employee(String name) {      this.name = name;   }   // Assign the age of the Employee  to the variable age.   public void empAge(int empAge) {      age = empAge;   }   /* Assign the designation to the variable designation.*/   public void empDesignation(String empDesig) {      designation = empDesig;   }   /* Assign the salary to the variable salary.*/   public void empSalary(double empSalary) {      salary = empSalary;   }   public void empFavoriteColor(String empColor) {       favoriteColor = empColor;   }   /* Print the Employee details */   public void printEmployee() {      System.out.println("Name:"+ name );      System.out.println("Age:" + age );      System.out.println("Designation:" + designation );      System.out.println("Salary:" + salary);      System.out.println("Favorite color:" + favoriteColor);   }}import java.io.*;public class EmployeeTest {   public static void main(String args[]) {      /* Create two objects using constructor */      Employee empOne = new Employee("James Smith");      Employee empTwo = new Employee("Mary Anne");      Employee empThree = new Employee("Alex Johnson");      // Invoking methods for each object created      empOne.empAge(26);      empOne.empDesignation("Senior Software Engineer");      empOne.empSalary(1000);      empOne.printEmployee();      empOne.empFavoriteColor("Green");      empTwo.empAge(21);      empTwo.empDesignation("Software Engineer");      empTwo.empSalary(500);      empTwo.printEmployee();      empTwo.empFavoriteColor("Blue");   }}