运行程序时找不到主类

Question

private int month;
private int day;
private int year;

public Date(int month, int day, int year){//constructor
    this.month = month;//initilize 
    this.day = day;
    this.year = year;
}

public void setMonth(int month){
    this.month = month;//stores the names
}
public void setDay(int day){
    this.day = day;
}
public void setYear(int year){
    this.year = year;
}
public int getMonth(){
    return month;//return value

}
public int getDay(){
  return day;
}
public int getYear(){
    return year;
}
public String displayDate(){

    return month + "/" + day + "/" + "/" + year;


}

}

Answer 1

只需在类中添加一个main方法。

public class Date {

    private int month;
    private int day;
    private int year;

    public Date(int month, int day, int year){//constructor
        this.month = month;//initilize
        this.day = day;
        this.year = year;
    }

    public void setMonth(int month){
        this.month = month;//stores the names
    }
    public void setDay(int day){
        this.day = day;
    }
    public void setYear(int year){
        this.year = year;
    }
    public int getMonth(){
        return month;//return value

    }
    public int getDay(){
        return day;
    }
    public int getYear(){
        return year;
    }
    public String displayDate(){

        return month + "/" + day + "/" + "/" + year;


    }

    public static void main(String[] args) {
        Date date = new Date(11,11,1991);
        System.out.println(date.displayDate());
    }
}

要运行代码，右键单击main方法，然后单击“run date.main（）”

这对于测试来说是很好的，但是在实际的程序中，您将在包中的其他类中调用Date类。