调整框架大小时，JLabel的位置会变为奇怪的位置

Question

I'm just doing my personal project that draws a basic map using Swing.

I have many issues but the worst one is that the position of JLable s changes every time I

1. Resize the frame
2. Set them invisible and visible again (setvisible(false)->setvisible(true))
3. Move the screen to another tab 'Map 2' and come back to Map 1 (The frame has JTabbedPane )

It's sad that I don't have enough reputation to upload images :(

all the JLable s are located on the top of the JPanel .

It's like

Before
.-----------------------------------------------
.-----------------------------------------------
.---------Label1-----------------------------
.-----------------------------------------------
.------------------Label2--------------------
.-----------------------------------------------
.-------------------------------Label3-------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------

After
.-----------------------------------------------
.---------Label1 Label2 Label3-----------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------
.-----------------------------------------------

I also tried using setLocation(new Point(x,y)); after resizing happens but nothing came out.

Any tips will be appreciated. :)

Answer 1

You have used absolute positioning without setting the layout accordingly. Refreshing the display in the presence of FlowLayout , the default for JPanel , causes the layout you see in after . Using setLayout(null) may work, but the preferred approach is to use the intended layout manager .