无法正确调用Java中的void函数以将输出正确输出到控制台。

huangapple
go评论93阅读模式
英文:

Unable to correcty call a void function in Java to output to the console

问题

以下是您提供的代码的翻译部分：

Employee.java：

  1. public class Employee {
  2.     private String _first_name;
  3.     private String _last_name;
  4.     private double _monthly_salary;
  6.     public Employee(String first_name, String last_name, double monthlySalary) {
  7.         setFirstName(first_name);
  8.         setLastName(last_name);
  9.         setMonthlySalary(monthlySalary);
  10.     }
  12.     public String getFirstName() {
  13.         return _first_name;
  14.     }
  16.     public void setFirstName(String first_name) {
  17.         _first_name = first_name;
  18.     }
  20.     public String getLastName() {
  21.         return _last_name;
  22.     }
  24.     public void setLastName(String lastName) {
  25.         _last_name = lastName;
  26.     }
  28.     public double getMonthlySalary() {
  29.         return _monthly_salary;
  30.     }
  32.     public void setMonthlySalary(double monthlySalary) {
  33.         if (monthlySalary < 0.0) {
  34.             monthlySalary = 0.0;
  35.         }
  36.         _monthly_salary = monthlySalary;
  37.     }
  39.     public void developerInfo() {
  40.         System.out.println("Name:    Erin");
  41.         System.out.println("Course:  Object-Oriented Programming");
  42.         System.out.println("Program: Three \n");
  43.     }
  44. }

EmployeeTest.java：

  1. public class EmployeeTest {
  2.     public static void main(String[] args) {
  3.         Employee employee1 = new Employee("John", "Doe", 2875.00);
  4.         Employee employee2 = new Employee("Jane", "Doe", 3150.00);
  6.         System.out.println("Before 20% raise:");
  7.         System.out.printf("Employee 1: %s %s; Yearly Salary: $%.2f%n",
  8.                 employee1.getFirstName(), employee1.getLastName(),
  9.                 12 * employee1.getMonthlySalary());
  10.         System.out.printf("Employee 2: %s %s; Yearly Salary: $%.2f%n",
  11.                 employee2.getFirstName(), employee2.getLastName(),
  12.                 12 * employee2.getMonthlySalary());
  14.         employee1.setMonthlySalary(employee1.getMonthlySalary() * 1.2);
  15.         employee2.setMonthlySalary(employee2.getMonthlySalary() * 1.2);
  17.         System.out.println("After 20% raise:");
  18.         System.out.printf("Employee 1: %s %s; Yearly Salary: $%.2f%n",
  19.                 employee1.getFirstName(), employee1.getLastName(),
  20.                 12 * employee1.getMonthlySalary());
  21.         System.out.printf("Employee 2: %s %s; Yearly Salary: $%.2f%n",
  22.                 employee2.getFirstName(), employee2.getLastName(),
  23.                 12 * employee2.getMonthlySalary());
  24.     }
  25. }

请注意，开头的 "I have the following class written in the Employee.java script:" 和 "With the corresponding test class written in a separate script called EmployeeTest.java:" 这两句话没有被翻译，因为您要求只返回翻译好的部分。

英文:

I have the following class written in the Employee.java script:

  1. public class Employee {
  2. 	//***************************************************************
  3. 	//
  4. 	//  Developer:         Erin
  5. 	//
  6. 	//  Program #:         3
  7. 	//
  8. 	//  File Name:         Program3.java
  9. 	//
  10. 	//  Course:            Object-Oriented Programming - Java 
  11. 	//
  12. 	//  Due Date:          
  13. 	//
  14. 	//  Instructor:        Prof. Fred
  15. 	//
  16. 	//  Chapter:           3
  17. 	//
  18. 	//  Description:
  19. 	//  Program creates an Employee class that includes three (3) private instances:
  20.         //   1) first name (String)
  21.         //   2) last name (String)
  22. 	//   3) monthly salary (double)
  23. 	//  Program provides:
  24. 	//   a) a constructor that initializes instance variables
  25. 	//   b) set and get methods for each instance variable
  26. 	//   c) test app named EmployeeTest that demonstrates Employee class capabilities
  27. 	//   d) two (2) Employee objs, from which obj&#39;s yearly salary is displayed
  28. 	//   e) display of 20% raise for each Employee;s yearly salary
  29. 	//
  30. 	//***************************************************************
  31. 		    private String _first_name;
  32. 		    private String _last_name;
  33. 		    private double _monthly_salary;
  35. 		    public Employee(String first_name, String last_name, double monthlySalary)
  36. 		    {
  37. 		       setFirstName(first_name);
  38. 		       setLastName(last_name);
  39. 		        setMonthlySalary(monthlySalary);
  40. 		    }
  41. 		   
  42. 		    public String getFirstName()
  43. 		    {
  44. 		        return _first_name;
  45. 		    }
  46. 		    public void setFirstName(String first_name)
  47. 		    {
  48. 		    	_first_name = first_name;
  49. 		    }
  50. 		   
  51. 		    public String getLastName()
  52. 		    {
  53. 		        return _last_name;
  54. 		    }
  55. 		   
  56. 		    public void setLastName(String lastName)
  57. 		    {
  58. 		    	_last_name =lastName;
  59. 		    }
  60. 		   
  61. 		    public double getMonthlySalary()
  62. 		    {
  63. 		        return _monthly_salary;
  64. 		    }
  65. 		   
  66. 		    public void setMonthlySalary(double monthlySalary)
  67. 		    {
  68. 		        if(monthlySalary &lt; 0.0)
  69. 		        {
  70. 		        	monthlySalary = 0.0;
  71. 		        }
  72. 		       
  73. 		        _monthly_salary = monthlySalary;
  74. 		    }
  75. 	//***************************************************************
  76. 	//
  77. 	//  Method:       developerInfo
  78. 	// 
  79. 	//  Description:  The developer information method of the program
  80. 	//
  81. 	//  Parameters:   None
  82. 	//
  83. 	//  Returns:      N/A 
  84. 	//
  85. 	//**************************************************************
  86.     public void developerInfo()
  87.     {
  88.        System.out.println(&quot;Name:    Erin&quot;);
  89.        System.out.println(&quot;Course:  Object-Oriented Programming&quot;);
  90.        System.out.println(&quot;Program: Three \n&quot;);
  91. 	}
  92. }

With the corresponding test class written in a separate script called EmployeeTest.java:

  1. public class EmployeeTest {
  2. 	public static void main(String[] args) {
  3. 		
  4. 		**developerInfo();**
  5. 		
  6. 		Employee employee1 = new Employee(&quot;John&quot;, &quot;Doe&quot;, 2875.00);
  7. 		Employee employee2 = new Employee(&quot;Jane&quot;, &quot;Doe&quot;, 3150.00);
  9. 		System.out.printf(&quot;%s %n&quot;, &quot;Before 20% raise:&quot;);
  10. 		System.out.printf( &quot;Employee 1: %s %s; Yearly Salary: $%.2f\n&quot;,
  11.                 employee1.getFirstName(), employee1.getLastName(),
  12.                 12 * employee1.getMonthlySalary() );
  13.         System.out.printf( &quot;Employee 2: %s %s; Yearly Salary: $%.2f\n&quot;,
  14.                 employee2.getFirstName(), employee2.getLastName(),
  15.                 12 * employee2.getMonthlySalary() );
  16. 		
  17. 		employee1.setMonthlySalary(employee1.getMonthlySalary() * 1.2);
  18. 		employee2.setMonthlySalary(employee2.getMonthlySalary() * 1.2);
  20. 		System.out.printf(&quot;%s %n&quot;, &quot;After 20% raise:&quot;);
  21. 		System.out.printf( &quot;Employee 1: %s %s; Yearly Salary: $%.2f\n&quot;,
  22.                 employee1.getFirstName(), employee1.getLastName(),
  23.                 12 * employee1.getMonthlySalary() );
  24.         System.out.printf( &quot;Employee 2: %s %s; Yearly Salary: $%.2f\n&quot;,
  25.                 employee2.getFirstName(), employee2.getLastName(),
  26.                 12 * employee2.getMonthlySalary() );
  27. 		
  28. 	}
  29. }

I cannot figure out how to call the developerInfo function in order get that to print to the console. Expected output is:

  1. Name: Erin
  2. Course: Object-Oriented Programming
  3. Program: Three
  5. Before 20% raise: 
  6. Employee 1: John Doe; Yearly Salary: $34500.00
  7. Employee 2: Jane Doe; Yearly Salary: $37800.00
  8. After 20% raise: 
  9. Employee 1: John Doe; Yearly Salary: $41400.00
  10. Employee 2: Jane Doe; Yearly Salary: $45360.00

Any insight would be so appreciated! Thank you!

答案1

得分: 2

存在两种可能性。首先，你可以将方法设为静态的：

  1. public static void developerInfo() {
  2.     System.out.println("Name:    Erin");
  3.     System.out.println("Course:  Object-Oriented Programming");
  4.     System.out.println("Program: Three \n");
  5. }

然后你可以使用 Employee.developerInfo() 调用该方法。第二种方法是你可以使用 Employee 类的实例来调用该方法：

  1. employee1.developerInfo();

由于它与雇员本身不直接相关，我会选择第一种选项，或者将该方法外包出去。

英文:

There exists two possibilites. First you can make the method static:

  1. public static void developerInfo() {
  2.     System.out.println(&quot;Name:    Erin&quot;);
  3.     System.out.println(&quot;Course:  Object-Oriented Programming&quot;);
  4.     System.out.println(&quot;Program: Three \n&quot;);
  5. }

Then you can call the method with Employee.developerInfo(). Second you can use an instance of the Employee class and you can call the method:

  1. employee1.developerInfo();

Since it is not directly related to an employee, I would take the first option or outsource the method.

huangapple
  • 本文由 发表于 2020年9月20日 04:25:42
  • 转载请务必保留本文链接：https://go.coder-hub.com/63973122.html
  • java
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定