How to set fix size of jlabel?

问题

I am trying to make a java desktop application where I am using multiple JLabel I want to set fix height and width of JLabel. How can I achieve this?

Here is my code

public class Second extends JFrame
{
    JPanel panel1,panel2;
    JLabel label=new JLabel();
    ArrayList<JLabel> lbllist = new ArrayList<>();

    public Second()  
    {
        super("Simple Timer");
        {
            getContentPane().setBackground(new java.awt.Color(255,255,255));
        } 
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        Container c = getContentPane();
        c.setLayout( new FlowLayout());
        setUndecorated(true);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds(0,0,screenSize.width, screenSize.height);

        panel2=new JPanel();
        panel2.setBounds(360, 180, 360, 1020);
        panel2.setBackground(new java.awt.Color(255,153,51));
        c.add(panel2);
        JPanel panel3 = createPanel();
        panel1.setLayout(new GridBagLayout());
        panel1.add(panel3);

        JPanel panel4 = createPanel(); 
        panel2.setLayout(new GridBagLayout());
    //  jPanel2.setLayout(null);
        panel2.add(panel4);

        setLayout(null);
   }

   private JPanel createPanel() {
        JPanel panel = new JPanel(new GridLayout(0, 1, 10, 5));
        EmptyBorder panelBorder = new EmptyBorder(10, 5, 10, 10);
        panel.setBorder(panelBorder);
        panel.setBackground(new java.awt.Color(255, 153, 51));
        panel.setOpaque(true);
        EmptyBorder border1 = new EmptyBorder(5, 20, 15, 18);

        Border border = BorderFactory.createLineBorder(Color.BLUE, 2);
        for (int i = 0; i <11; i++) {
            label = new JLabel("<html>Case &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Item&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CaseNum<br><font color=yellow>Party1<br>Party2</font></html>");
            label.setFont(new java.awt.Font("Times New Roman", 1, 18));
            label.setBorder(border);
            label.setSize(300, 100);
            label.setBorder(border1);
            Dimension d = label.getPreferredSize();
            label.setBackground(Color.GRAY);
            label.setForeground(new java.awt.Color(255, 255,255 ));
            label.setOpaque(true);
            lbllist.add(label);
            panel.add(label);
        }
        return panel;
    }

When I reduce text size or text from JLabel then size of JLabel reduced but I want that when i reduced or remove any text from JLabel but size of Jlabel should not reduced it should fix

How can I get this?

Thanks in advance

回答1:

You can set a fixed the size by setting the minimum, preferred and maximum size:

setMinimumSize(width, height);
setPreferredSize(width, height);
setMaximumSize(width, height);

As the Link from MadProgrammer, you need to override these methods, not using them from outside, based on the reasons mentioned in this link.

回答2:

if this method not work

setMinimumSize(width, height);
setPreferredSize(width, height);
setMaximumSize(width, height);

then use it

setMinimumSize(new Dimension(width, height));
setPreferredSize(new Dimension(width, height));
setMaximumSize(new Dimension(width, height));

回答3:

Use JLabel.setPreferredSize(width, height); The jpanel does not have a layout, try Jpanel pane =new JPanel(new FlowLayout（））；

回答4:

An easy work around (without overriding existing classes) is to;

Create a JPanel specifically for the component
Set the size for the JPanel
Place the component within the JPanel
Place the JPanel where you would have originally placed the component

e.g.

JPanel mainPanel = new JPanel(); //Assume this is the panel you are placing things into.

JLabel nameLabel = new JLabel("Name:");
JPanel nameLabelPanel = new JPanel();
nameLabelPanel.setPreferredSize(new Dimension(100, 25));
JPanel.add(nameLabel);
mainPanel.add(nameLabelPanel);

来源：https://stackoverflow.com/questions/22920046/how-to-set-fix-size-of-jlabel

标签

java

swing

jlabel

null-layout-manager