將文本文件調用到java

Question

當我運行以下代碼時，它僅打印「year \ tposition \ tname \ tMonthlySalary \ tAnnualSales \ tStockPrice」，而不是存儲在data.txt中的信息。它不計算2014年和2015年的平均值。我使用的是NetBeans代碼，並沒有看到任何錯誤。

data.txt中有

2014員工史密斯，詹姆斯2000

2014業務員約翰遜，瑪麗3500 10000

2014執行威廉姆斯，羅伯特2800 25

2015年員工瓊斯，芭芭拉4000

2015業務員布朗威廉3700 5000

2015年執行戴維斯，珍妮弗2600 51

2014員工米勒，理查德3900

2014業務員威爾遜，蘇珊4200 7000

2014執行摩爾定律，約瑟夫1900 65

2015年員工泰勒，多蘿西3700

2015業務員Anderson，Christopher 3200 15000

2015年執行托馬斯，南希4400 33

class Employee{ 
private String year; 
private String name; 
private String position; 
private double monthlySalary; 
public Employee(String year, String position, String name, double monthlySalary){ 
    this.year = year; 
    this.position = position; 
    this.name = name; 
    this.monthlySalary = monthlySalary; 
} 
public double annualSalary(){ 
    return monthlySalary*12; 
} 
public String toString(){ 
    return year+"\t"+position+"\t"+name +"\t" + monthlySalary +"\t"; 
} 
}class Salesman extends Employee{ 
private double annualSales; 

public Salesman(String year, String position, String name, double monthlySalary, double annualSales){ 
    super(year, position, name, monthlySalary); 
    this.annualSales = annualSales; 
} 

public double annualSalary(){ 
    double commission = this.annualSales*0.2; 
    if(commission>20000){ 
     commission = 20000; 
    } 
    return super.annualSalary()+commission; 
} 
public String toString(){ 
    return super.toString()+annualSalary(); 
} 
}class Executive extends Employee{ 
private double stockPrice; 
public Executive(String year, String position, String name, double monthlySalary, double stockPrice){ 
    super(year, position, name, monthlySalary); 
    this.stockPrice = stockPrice; 
} 
public double annualSalary(){ 
    double bonus=0; 
    if(this.stockPrice>50){ 
     bonus = 30000; 
    } 
    return super.annualSalary() + annualSalary(); 
} 
public String toString(){ 
    return super.toString()+"\t"+ this.stockPrice+"\n"; 
} 

} 

class TestEmployee { 
ArrayList<Employee> employee2014 = new ArrayList<Employee>(); 
ArrayList<Employee> employee2015 = new ArrayList<Employee>(); 

public void MakeArray(){ 
    try{ 
     Scanner sc = new Scanner(new File("data.txt")); 
     while(sc.hasNext()){ 
      String year = sc.nextLine(); 
      String[] data = year.split(" "); 
      if(data[0] == "2014"){ 
       if(data[1].equalsIgnoreCase("Employee")){ 
        employee2014.add(new Employee(data[0],data[1],data[2],Double.parseDouble(data[3]))); 
       }else if(data[1].equalsIgnoreCase("Salesman")){ 
        employee2014.add(new Salesman(data[0],data[1],data[2],Double.parseDouble(data[3]),Double.parseDouble(data[4])));     
       }else if(data[1].equalsIgnoreCase("Executive")){ 
        employee2014.add(new Executive(data[0],data[1],data[2],Double.parseDouble(data[3]),Double.parseDouble(data[4])));      
       } 
      }if(data[0] == "2015"){ 
       if(data[1].equalsIgnoreCase("Employee")){ 
        employee2015.add(new Employee("2015",data[1],data[2],Double.parseDouble(data[3]))); 
       }else if(data[1].equalsIgnoreCase("Salesman")){ 
        employee2015.add(new Salesman("2015",data[1],data[2],Double.parseDouble(data[3]),Double.parseDouble(data[4])));     
       }else if(data[1].equalsIgnoreCase("Executive")){ 
        employee2015.add(new Executive("2015",data[1],data[2],Double.parseDouble(data[3]),Double.parseDouble(data[4])));      
       } 
      } 
     }  
    }catch(FileNotFoundException nf){ 
     System.out.println("File not found"); 
    } 
}public void Result(){ 
    double average2014=0; 
    double total2014=0; 
    double average2015=0; 
    double total2015=0; 
    System.out.print("Data of 2014:\n" 
      + "Year\tPosition\tName\tMonthlySalary\tAnnualSales\tStockPrice"); 
    for(Employee employee14: employee2014){ 
     System.out.println(employee14.toString()); 
     total2014 +=employee14.annualSalary(); 
    }average2014 = total2014/employee2014.size(); 
    System.out.print("\nThe average annual salary of 2014 is " + average2014+"\n"); 
    System.out.println("=================================="); 

    System.out.print("Data of 2015:\n" 
      + "Year\tPosition\tName\tMonthlySalary\tAnnualSales\tStockPrice"); 
    for(Employee employee15: employee2015){ 
     System.out.println(employee15.toString()); 
     total2015 +=employee15.annualSalary(); 
    }average2015 = total2014/employee2015.size(); 
    System.out.print("\nThe average annual salary of 2015 is " + average2015+"\n"); 
} 
public static void main(String[] args){ 
    TestEmployee te = new TestEmployee(); 
    te.MakeArray(); 
    te.Result(); 
} 

}

Answer 1

在「MakeArray」方法（方法的第一個字母應該是在約定小寫），你應該使用equals方法，而不是「==」操作者：

if(data[0] == "2014") --> if(data[0].equals("2014")) 
if(data[0] == "2015") --> if(data[0].equals("2015")) 

修復也是annualSalary（）（在執行類）的方法如下：

public double annualSalary(){ 
    double bonus=0; 
    if(this.stockPrice>50){ 
     bonus = 30000; 
    } 
    return super.annualSalary() + bonus; 
}