Java类型错误

Question

我得到错误类型的非法开始在第一个嵌套的if语句，非法开始有看着类似的问题，我理解这通常是由一个错位的支柱引起的，不过，我看不到一个。谁能帮忙？

public class Journey 
{ 
    private int date; 
    private double time; 
    private int busNumber; 
    private int journeyType; 
    public static double dayCharge; 
    public static final double maxDayCharge = 3.50; 
    public static double weekCharge; 
    public static final double maxWeekCharge = 15; 
    public static double monthCharge; 
    public static final double maxMonthCharge = 48; 
    private int journeyId; 
    private static int numberOfJourneys; 
    private double costOfJourney; 

    public int getDate(){ 
     return date; 
    } 
    public Double getTime(){ 
     return time; 
    } 
    public int getBusNumber(){ 
     return busNumber; 
    } 
    public double journeyCost(journey reqJourney){ 
     if (journeyType = 1){      //this is where the error occurs 
      if (dayCharge =< 2.50) 
      { 
       costOfJourney = 1; 
      } 
      else 
      { 
       costOfJourney = maxDayCharge-dayCharge; 
      } 

     } 
     else if (journeyType = 2) 
     { 
      if (dayCharge =< 1.80) 
      { 
       costOfJourney = 1.70; 
      } 
      else 
      { 
       costOfJourney = maxDayCharge-dayCharge; 
      } 
     } 
     else if (journeyType = 3) 
     { 
      if (dayCharge =< 1.60) 
      { 
       costOfJourney = 1.90; 
      } 
      else 
      { 
       costOfJourney = maxDayCharge-dayCharge; 
      } 

     }   
     return costOfJourney;  
    } 
    public boolean isInSequence(journey reqJourney){ 
     journey prevJourney = jArray.get(jArray.size()-1); 
     if (prevJourney.date > reqJourney.date) 
     { 
      return false; 
     } 

    } 
} 

Answer 1

您需要使用==测试平等。 =是赋值运算符。

甲骨文公司拥有良好的tutorial docs解释Java的运营商。

在相关说明中，Object.equals()和==之间也有一个重要的区别，这在其他堆栈溢出问题（如this one）中有详细介绍。但是，比较您正在做的基本类型时，==就是您想要的。

Answer 2

应该是：

if (journeyType == 1){ 

表达，如果块应该总是导致布尔值（无论是真实的（或）假）。