Question

我希望从当前日期开始7天。我不确定需要什么代码。

我必须找到当前日期的代码是：

DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
Calendar cal = Calendar.getInstance();
String date = dateFormat.format(cal.getTime());

Answer 1

我在堆栈溢出时发现了以下代码.... How can I increment a date by one day in Java?

            from Tkinter import *
            import math
            import time

            root = Tk()
            root.geometry("800x480")
            root.configure(background='darkgrey')
            content = Frame(root,)

            #Dimensions of Window
            w = 800
            h = 480

            #Get Angle
            file_angle = open("current_angle.txt")
            #read file and remove "/n" from the end of the string
            string_angle = ((file_angle.read())[:-2])
            #Convert string to a number
            read_angle = float(string_angle)

            if read_angle > 90 or read_angle <-90:
                deg_angle = read_angle - 180

            else:
                deg_angle = read_angle

            angle = math.radians(deg_angle)
            swath_width = w / 5

            if deg_angle > -90 and deg_angle < 90:
                #Center Line
                centertopx = (w/2) + ((h / 1.5) * math.tan(angle))
                centertopy = 0
                centerbottomx = (w/2) + ((h - (h / 1.5)) * math.tan(-1 * angle))
                centerbottomy = h

            if deg_angle == 90 or deg_angle == -90:
                centertopx = 0
                centertopy = h / 2
                centerbottomx = w
                centerbottomy = h / 2

            #Create Guidance Map
            livemap = Canvas(root, width=w, height=h)
            #Outline of map
            livemap.create_rectangle(0,0,w,h, outline="black", width=5, fill="#9E9E9E")


            #Drawing lines
            livemap.create_line(centertopx, centertopy, centerbottomx, centerbottomy, fill="red", width=4)

            #stationary parts of map
            #Triangle that represents vehicle
            livemap.create_polygon(
                ((w/2)-(w * 0.04)),((h / 1.5)+(h * 0.1)),((w/2)+(w *                    0.04)),((h / 1.5)+(h * 0.1)),(w/2),(h / 1.5),
                outline="black", fill="darkorange", width=2)
            livemap.create_line((w/2),((h / 1.5)+(h*0.07)),(w/2),(h / 1.5),fill="black", width=2)
            livemap.create_polygon(((w/2)-(w * 0.04)),((h / 1.5)+(h * 0.1)),((w/2)+(w * 0.04)),((h / 1.5)+(h * 0.1)),(w/2),((h / 1.5)+(h*0.07)),
                outline="black", fill="darkorange", width=2)

            #Put canvas into window
            livemap.grid(column=0, row=0, columnspan=4, rowspan=4)

            root.mainloop()

Answer 2

LocalDateTime.now().plusDays(7)

https://docs.oracle.com/javase/tutorial/datetime/iso/datetime.html

如何从7天开始获取日期

2 个答案: