Question

我有一组带有自定义图标和3个按钮的JLabel。第一次单击面板重绘时显示一个按钮（开始）标签显示为：http://imgur.com/8dcpCe7。当我点击第二个（Urmatorul）时，我希望删除窗格的内容，然后替换标签，但这就是它的外观：http://imgur.com/nY87rCx。最后一个按钮是一个退出按钮。另外，我认为是关于GridBagConstraints ..

static JLabel[] label = new JLabel[words[random].length()];  // in the main class

//in the JPanel class

    for(int i = 0; i < label.length; i++)
            label[i] = new JLabel(box);

        add(sButton);

        //This is the first button ( that clears the jpanel for the first time and adds the 2 buttons + jlabels

        sButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){

                remove(sButton);
                c.gridx = 3;
                add(text,c);
                c.gridx = 4;
                add(field, c);
                c.gridx = 0;
                for(int i = 0; i < label.length; i++){

                    c.gridy = 1;
                    c.gridx++;
                    c.insets = new Insets(400,0,0,0);
                    add(label[i],c);
                                    }
                c.insets = new Insets(0,0,0,0);
                c.gridy ++;
                c.gridx = 0;    
                c.gridwidth = 4;
                c.weighty = 0.09;
                c.anchor = GridBagConstraints.SOUTH;
                add(eButton, c);
                c.gridx = 3;
                add(nButton, c);
                revalidate();
                repaint();


            }

        });

        eButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                System.exit(0);
            }
        });

        // The second button, which i am having trouble with ( i just copied the code from the first button listener)

        nButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){

            label = new JLabel[words[random].length()];
            for(int i = 0; i < label.length; i++)
                label[i] = new JLabel(box);
            removeAll();
            revalidate();
            repaint();
                    c.gridx = 3;
                    add(text,c);
                    c.gridx = 4;
                    add(field, c);
                    c.gridx = 0;
                    for(int i = 0; i < label.length; i++){

                        c.gridy = 1;
                        c.gridx++;
                        c.insets = new Insets(400,0,0,0);
                        add(label[i],c);
                                        }
                    c.insets = new Insets(0,0,0,0);
                    c.gridy ++;
                    c.gridx = 0;    
                    c.gridwidth = 4;
                    c.weighty = 0.09;
                    c.anchor = GridBagConstraints.SOUTH;
                    add(eButton, c);
                    c.gridx = 3;
                    add(nButton, c);
                    revalidate();
                    repaint();
             }
        });
    }

Answer 1

repaint();和revalidate();应该有效，但请尝试添加新的可见组件并将其移至可见JPanel并告诉我们会发生什么。

如何重新绘制JPanel

1 个答案: