jlabel | 易学教程

JLabel not visible on Jpanel

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问题 I'm working on a program in which I'd used a JTextArea , JButton , JLabel and JPanel . The logic I'd to implement is: user types a text in the given textArea and then click on the button . On button click I'd to retrieve the text from the textArea and create a label with the written text(as in textArea ) and show it on the panel . Everything I'd done previously is correct but the problem is with the label and panel . The label is not visible on the panel . The code snippets is: import java

Mouse event in Java

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问题 I am trying to move a JComponent say a label over a table.I am tracking this event using MouseMotionListener's mouseDragged method.This method perfectly helps me in tracking the item.Is there a way to track the mouse release after dragging is complete(.ie the dropping event). tktLabel1.addMouseMotionListener(new MouseMotionListener() { public void mouseDragged(MouseEvent arg0) { tktLabel1.setBounds(tktLabel1.getX() + arg0.getX(), tktLabel1.getY() + arg0.getY(), width, height); } public void

Best way to handle JFrame components from outside class

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问题 I was developing a swing application which calls multiple methods & initializes different classes. Also I have multiple threads in which they process intermediate results. My requirement is to display that intermediate data on some labels and text boxes on the fly. Please help me which of the below approach is best in terms of memory and performance. I can have setter methods for all my labels and text boxes. So that I can call these methods using that swing class object but in that case I

Why do I need to reset setText() in a JLabel to prevent errors?

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问题 As a follow-up to this question that I posted earlier, I am wondering about the cause of the issue I had. The problem was that I was getting this error when updating a JLabel with a lot of HTML text. Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.text.html.StyleSheet$ListPainter.paint(Unknown Source) at javax.swing.text.html.ListView.paintChild(Unknown Source) at javax.swing.text.BoxView.paint(Unknown Source) at javax.swing.text.html.BlockView.paint

Putting 3 dots at the beginning of JLabel

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问题 When the text in JLabel is too long there are visible 3 dots at the end of text. Is it possible to put them at the beginning? 回答1: You may consider using FontMetrics . class to see the length of your text under the current font. _________________________________ | | This is some really long text that I want to fit in the small label |________________________________ ^^^ YOUR LABEL ^^^ Say you want to fit that long text into that label. Here is what you can do (and this is just a wild guess

How to add multi-line label on a Java GUI?

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问题 I have made a java swing GUI. Now I want to display a static message on that but the message is multi-line and the JLabel is single line. How can I display that message? Is there any property of JLabel which we can set to display the multiple line message? Will I have to use several JLabels for multiple lines? Is there any other way I can display that message? 回答1: How to Use HTML in Swing Components Displaying Multi Line Text 回答2: You can do JLabel l = new JLabel("<html><p>Hello World! blah

Java Swing - JLabel Location

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问题 I have problem while setting the Jlabel location. I set the content pane to some JPanel, I created and tried to add my JLabel. JLabel mainTitle = new JLabel("SomeApp"); mainTitle.setFont(new Font("Arial",2 , 28)); mainTitle.setBounds(0,0, 115, 130); getContentPane().add(mainTitle); I want that my JPanel will be on the top left corner on my application and what I am getting is "SomeApp" on the top center.(and not top left). btw I tried to add JButton the and the I can`t change the width,height

newline character in JLabel.setText()

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问题 How can I insert a newline when I am using JLabel.setText()? I tried to use Html but can seem to make it work for setText, only for the initial declaration of the jLabel the way to do it when initially declaring the jlabel is: label = new JLabel("<html>Hello World!<br>blahblahblah</html>"); my code: textString += "<html> quantityTextField.getText() + theInventory.findItem(UPCTextField.getText()).toString() + <br> </html>"; purchaseInfo.setText( textString); it displays the html tags and the

Cannot remove JLabel (Netbeans)

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问题 (sorry for my english) When I add JLabel to Form in Netbeans, I couldn´t move with it.I removed it from form. Now I want compile project and it show error message: error: cannot find symbol jLabel8 = new javax.swing.JLabel(); other jLabels are ok, but this one is wrong. i remove it from form, but it is always in inspector. check printscreens (1. jLabel8 is wrong, i cant remove it; 2.other labels are ok, in menu is option to delete) : Screen1: Screen2: 回答1: 1) to hard to help you with Java

How to Hide or remove a JLabel

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问题 I have declared a JLable as follows; l = new JLabel("Hello"); l.setHorizontalAlignment(SwingConstants.CENTER); panel.add(l); Now, i want to hide or remove it. What should be the method i should call ? i tried l.removeAll(); <--- nothing hapend. there's another one calle remove(int) which takes an int. But i am not sure what to pass as the parameter. There's also something called hide() . but it's deprecated. 回答1: i tried l.removeAll(); <--- nothing hapend. you need to call to remove on JPanel