Java 类型错误的非法开始

Question

我在第一个嵌套 if 语句中遇到非法开始类型错误，查看了类似的问题后，我知道这通常是由错位的大括号引起的，但是，我看不到。有人可以帮忙吗？

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==来测试相等性。 = 是赋值运算符。

Oracle有好tutorial docs解释 Java 运算符。

相关说明中，Object.equals() 和 == 之间也存在重要区别，其他 Stack Overflow 问题(如 this one)对此进行了详细介绍。 。但是，当像您一样比较原始类型时， == 就是您想要的。