Jframe执行时尺寸不正确，有什么原因吗？
我正在制作一个游戏，但每当我运行第二个jFrame时，我必须调整它以便为第二个jFrame获得正确的大小，任何人都知道为什么？
这是第一个jFrame类中打开第二个方法的方法：
private void playButtonMouseClicked(java.awt.event.MouseEvent evt) { if (playerOneNameText.getText().equals("")) { } if (playerTwoNameText.getText().equals("")) { } else{ pOneName = playerOneNameText.getText(); pTwoName = playerTwoNameText.getText(); ChessBoardUI class1 = new ChessBoardUI(); // Creating object of Class1 class1.setVisible(true); this.setVisible(false); } } 这是第二个jFrame类，我必须resize才能使ge tit正确：
package chess; public class ChessBoardUI extends javax.swing.JFrame { public ChessBoardUI() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // private void initComponents() { jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); jLabel1 = new javax.swing.JLabel(); jLabel4 = new javax.swing.JLabel(); blackTeamName = new javax.swing.JLabel(); whiteTeamName = new javax.swing.JLabel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); getContentPane().setLayout(null); getContentPane().add(jLabel2); jLabel2.setBounds(21, 49, 0, 0); jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/chess/board.jpg"))); // NOI18N getContentPane().add(jLabel3); jLabel3.setBounds(0, 30, 400, 400); jLabel1.setText("Black:"); getContentPane().add(jLabel1); jLabel1.setBounds(400, 100, 34, 16); jLabel4.setText("White:"); getContentPane().add(jLabel4); jLabel4.setBounds(400, 150, 38, 16); blackTeamName.setText("jLabel5"); getContentPane().add(blackTeamName); blackTeamName.setBounds(400, 120, 41, 16); whiteTeamName.setText("jLabel5"); getContentPane().add(whiteTeamName); whiteTeamName.setBounds(400, 170, 41, 16); pack(); }// /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ // /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(ChessBoardUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(ChessBoardUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(ChessBoardUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(ChessBoardUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } // /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new ChessBoardUI().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JLabel blackTeamName; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JLabel whiteTeamName; // End of variables declaration }
我很快就读到了寻找特定方法。
那种方法是：
pack();
JFrame中的这个方法非常有用但也很难处理，你需要很好地理解如何设置每个组件的正确大小。 使用“null”布局也可以轻而易举地完成所有工作。
我的建议是忘记使用
setLayout(null)
因为根据我的经验，它提供的结果很少比其他布局更好。
我能告诉你的最好的事情是使用BoxLayout。 使用此布局，您可以精确设置每个组件的位置和大小。 诀窍还在于你可以使用rigidArea和Glue。
你的代码可以是：
// This is a BoxLayout with top to bottom orientation, the trick is to nest many JPanel // with BoxLayout in both the direction to have all working // What I want to achieve is: // // 1. Having a main box top to bottom where I will put: // - Top margin (a rigid area with dimension (0,MARGIN) // - Main JPanel with BoxLayout and LINE_AXIS (left to right) orientation // - Bottom margin (a rigid area like top margin) // // 2. In the main panel I will put: // - Left Margin (a rigid area with dimensions (MARGIN,0) // - A JPanel (leftPanel) Boxed top to bottom containing the things on the left that actually are jLabel3 and jLabel2 // - A little separator between the two panel, a rigid area (10,0) ie // - A JPanel (rightPanel) Boxed top to bottom containing the remaining 4 JLabels // - Right Margin (as left) // // 3. In rightPanel JPanel (BoxLayout.PAGE_AXIS, top to bottom) I will have: // - a rigid area space to match the position that I want // - the first label // - a rigid area.. etc so on // // For each JLabel I must set all: // - setPreferredSize(dimension) // - setMinimumSize(dimension) // - setMaximumSize(dimension) // // Then, if you specify also the JFrame is better, but you can try to pack(). // BoxLayout take care of sizes, not exceeding maximum and not making it smaller than minimum. Yust try it and you will love it. getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.PAGE_AXIS); JPanel main = new JPanel(); main.setLayout(new BoxLayout(main, BoxLayout.LINE_AXIS)); this.add(Box.createRigidArea(new Dimension(0,20))); // VERTICAL SPACE (top margin) this.add(main); this.add(Box.createRigidArea(new Dimension(0,20))); // VERTICAL SPACE (bottom margin) JPanel rightPanel = new JPanel(); rightPanel.setLayout( new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS)); JPanel leftPanel = new JPanel(); leftPanel.setLayout( new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS)); main.add(Box.createRigidArea(new Dimension(20,0))); // HORIZONTAL SPACE (left margin) main.add(leftPanel); main.add(Box.createRigidArea(new Dimension(10,0))); // HORIZONTAL SPACE (between the two) main.add(rightPanel); main.add(Box.createRigidArea(new Dimension(20,0))); // HORIZONTAL SPACE (right margin) // now you should have understood how it works, just try to fill the right and left panel with your labels. Remember to set preferredm, maximum and minimum sizes.
我希望这对你编辑有用，我想念一些“）”