我的课程包含javax.swing.JButton，javax.swing.JTextField
但是，在实例化类之后，我需要更改某些类型的属性。
我正在尝试使用this.getComponents()，但正在返回null。
这是我的代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package test;
import java.awt.Component;
import java.awt.Font;
/**
*
* @author Usuario
*/
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
Component[] component = this.getComponents();
System.out.println("this.getName():"+this.getName());
System.out.println("this.getClass().getName():"+this.getClass().getName());
System.out.println("component.length:"+component.length);
for(int i=0; i<component.length; i++) {
System.out.println("--component[i].getName()"+component[i].getName());
if (component[i] instanceof javax.swing.JTextField) {
javax.swing.JTextField jtf = (javax.swing.JTextField)component[i];
System.out.println(jtf.getName());
jtf.setFont(new Font("Serif",Font.PLAIN, 36));
}
}
UIManager.getLookAndFeelDefaults().put("TextField.font", new Font("Serif",Font.PLAIN, 36));
//UIManager.getDefaults().put("TextField.font", new Font("Serif",Font.PLAIN, 36));
//UIManager.put("TextField.font", new Font("Serif",Font.PLAIN, 36));
//this.updateUI(); // Is not suitable for javax.swing.JFrame
this.pack();
}
/**
* 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")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jtpBot = new javax.swing.JTabbedPane();
jpOne = new javax.swing.JPanel();
jpOneInner = new javax.swing.JPanel();
jbFirst = new javax.swing.JButton();
jtfOne = new javax.swing.JTextField();
jpOnePlot = new javax.swing.JPanel();
jpTwo = new javax.swing.JPanel();
jpTwoInner = new javax.swing.JPanel();
jbTwo = new javax.swing.JButton();
jtfTwo = new javax.swing.JTextField();
jpTwoPlot = new javax.swing.JPanel();
jpThree = new javax.swing.JPanel();
jpThreeInner = new javax.swing.JPanel();
jbThree = new javax.swing.JButton();
jtfThree = new javax.swing.JTextField();
jpThreePlot = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(255, 255, 255));
jtpBot.setBackground(new java.awt.Color(0, 0, 0));
jtpBot.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
jpOne.setBackground(new java.awt.Color(0, 191, 191));
jpOneInner.setBackground(new java.awt.Color(255, 0, 0));
jpOneInner.setBorder(javax.swing.BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED));
jbFirst.setText("First");
jbFirst.setMaximumSize(new java.awt.Dimension(70, 23));
jbFirst.setMinimumSize(new java.awt.Dimension(70, 23));
jbFirst.setPreferredSize(new java.awt.Dimension(70, 23));
jtfOne.setMaximumSize(new java.awt.Dimension(80, 20));
jtfOne.setMinimumSize(new java.awt.Dimension(80, 20));
jtfOne.setPreferredSize(new java.awt.Dimension(80, 20));
jpOnePlot.setBackground(new java.awt.Color(191, 191, 191));
jpOnePlot.setBorder(javax.swing.BorderFactory.createEtchedBorder());
javax.swing.GroupLayout jpOnePlotLayout = new javax.swing.GroupLayout(jpOnePlot);
jpOnePlot.setLayout(jpOnePlotLayout);
jpOnePlotLayout.setHorizontalGroup(
jpOnePlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 181, Short.MAX_VALUE)
);
jpOnePlotLayout.setVerticalGroup(
jpOnePlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
javax.swing.GroupLayout jpOneInnerLayout = new javax.swing.GroupLayout(jpOneInner);
jpOneInner.setLayout(jpOneInnerLayout);
jpOneInnerLayout.setHorizontalGroup(
jpOneInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpOneInnerLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jbFirst, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jtfOne, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jpOnePlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpOneInnerLayout.setVerticalGroup(
jpOneInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpOneInnerLayout.createSequentialGroup()
.addContainerGap()
.addGroup(jpOneInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpOneInnerLayout.createSequentialGroup()
.addGroup(jpOneInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbFirst, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jtfOne, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 117, Short.MAX_VALUE))
.addComponent(jpOnePlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
javax.swing.GroupLayout jpOneLayout = new javax.swing.GroupLayout(jpOne);
jpOne.setLayout(jpOneLayout);
jpOneLayout.setHorizontalGroup(
jpOneLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpOneLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpOneInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpOneLayout.setVerticalGroup(
jpOneLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jpOneLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpOneInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jtpBot.addTab("One", jpOne);
jpTwo.setBackground(new java.awt.Color(191, 0, 191));
jpTwoInner.setBackground(new java.awt.Color(0, 255, 0));
jpTwoInner.setBorder(javax.swing.BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED));
jbTwo.setText("Two");
jbTwo.setMaximumSize(new java.awt.Dimension(70, 23));
jbTwo.setMinimumSize(new java.awt.Dimension(70, 23));
jbTwo.setPreferredSize(new java.awt.Dimension(70, 23));
jtfTwo.setMaximumSize(new java.awt.Dimension(80, 20));
jtfTwo.setMinimumSize(new java.awt.Dimension(80, 20));
jtfTwo.setPreferredSize(new java.awt.Dimension(80, 20));
jpTwoPlot.setBackground(new java.awt.Color(191, 191, 191));
jpTwoPlot.setBorder(javax.swing.BorderFactory.createEtchedBorder());
javax.swing.GroupLayout jpTwoPlotLayout = new javax.swing.GroupLayout(jpTwoPlot);
jpTwoPlot.setLayout(jpTwoPlotLayout);
jpTwoPlotLayout.setHorizontalGroup(
jpTwoPlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 181, Short.MAX_VALUE)
);
jpTwoPlotLayout.setVerticalGroup(
jpTwoPlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
javax.swing.GroupLayout jpTwoInnerLayout = new javax.swing.GroupLayout(jpTwoInner);
jpTwoInner.setLayout(jpTwoInnerLayout);
jpTwoInnerLayout.setHorizontalGroup(
jpTwoInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpTwoInnerLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jbTwo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jtfTwo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jpTwoPlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpTwoInnerLayout.setVerticalGroup(
jpTwoInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpTwoInnerLayout.createSequentialGroup()
.addContainerGap()
.addGroup(jpTwoInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jpTwoPlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jpTwoInnerLayout.createSequentialGroup()
.addGroup(jpTwoInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbTwo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jtfTwo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 117, Short.MAX_VALUE)))
.addContainerGap())
);
javax.swing.GroupLayout jpTwoLayout = new javax.swing.GroupLayout(jpTwo);
jpTwo.setLayout(jpTwoLayout);
jpTwoLayout.setHorizontalGroup(
jpTwoLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpTwoLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpTwoInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpTwoLayout.setVerticalGroup(
jpTwoLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jpTwoLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpTwoInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jtpBot.addTab("Two", jpTwo);
jpThree.setBackground(new java.awt.Color(191, 191, 0));
jpThreeInner.setBackground(new java.awt.Color(0, 0, 255));
jpThreeInner.setBorder(javax.swing.BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED));
jbThree.setText("Three");
jbThree.setMaximumSize(new java.awt.Dimension(70, 23));
jbThree.setMinimumSize(new java.awt.Dimension(70, 23));
jbThree.setPreferredSize(new java.awt.Dimension(70, 23));
jtfThree.setMaximumSize(new java.awt.Dimension(80, 20));
jtfThree.setMinimumSize(new java.awt.Dimension(80, 20));
jtfThree.setPreferredSize(new java.awt.Dimension(80, 20));
jpThreePlot.setBackground(new java.awt.Color(191, 191, 191));
jpThreePlot.setBorder(javax.swing.BorderFactory.createEtchedBorder());
javax.swing.GroupLayout jpThreePlotLayout = new javax.swing.GroupLayout(jpThreePlot);
jpThreePlot.setLayout(jpThreePlotLayout);
jpThreePlotLayout.setHorizontalGroup(
jpThreePlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 181, Short.MAX_VALUE)
);
jpThreePlotLayout.setVerticalGroup(
jpThreePlotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
javax.swing.GroupLayout jpThreeInnerLayout = new javax.swing.GroupLayout(jpThreeInner);
jpThreeInner.setLayout(jpThreeInnerLayout);
jpThreeInnerLayout.setHorizontalGroup(
jpThreeInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpThreeInnerLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jbThree, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jtfThree, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jpThreePlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpThreeInnerLayout.setVerticalGroup(
jpThreeInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpThreeInnerLayout.createSequentialGroup()
.addContainerGap()
.addGroup(jpThreeInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jpThreePlot, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jpThreeInnerLayout.createSequentialGroup()
.addGroup(jpThreeInnerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbThree, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jtfThree, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 117, Short.MAX_VALUE)))
.addContainerGap())
);
javax.swing.GroupLayout jpThreeLayout = new javax.swing.GroupLayout(jpThree);
jpThree.setLayout(jpThreeLayout);
jpThreeLayout.setHorizontalGroup(
jpThreeLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jpThreeLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpThreeInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jpThreeLayout.setVerticalGroup(
jpThreeLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jpThreeLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jpThreeInner, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jtpBot.addTab("Three", jpThree);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jtpBot)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(69, 69, 69)
.addComponent(jtpBot)
.addContainerGap())
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* 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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
boolean bCanIuseOne = false;
boolean bCanIuseTwo = false;
boolean bThreadFree = true;
boolean bMouseFree = false;
// Variables declaration - do not modify
private javax.swing.JButton jbFirst;
private javax.swing.JButton jbThree;
private javax.swing.JButton jbTwo;
private javax.swing.JPanel jpOne;
private javax.swing.JPanel jpOneInner;
private javax.swing.JPanel jpOnePlot;
private javax.swing.JPanel jpThree;
private javax.swing.JPanel jpThreeInner;
private javax.swing.JPanel jpThreePlot;
private javax.swing.JPanel jpTwo;
private javax.swing.JPanel jpTwoInner;
private javax.swing.JPanel jpTwoPlot;
private javax.swing.JTextField jtfOne;
private javax.swing.JTextField jtfThree;
private javax.swing.JTextField jtfTwo;
private javax.swing.JTabbedPane jtpBot;
// End of variables declaration
}
输出：
run:
this.getName():frame0
this.getClass().getName():test.NewJFrame
component.length:1
--component[i].getName()null
BUILD SUCCESSFUL (total time: 19 seconds)
我想获得类似的东西：
javax.swing.JTextField jtfOne;
javax.swing.JTextField jtfThree;
javax.swing.JTextField jtfTwo;
javax.swing.JButton jbFirst;
javax.swing.JButton jbThree;
javax.swing.JButton jbTwo;
如何吗
PD：我正在与Netbeans合作......
编辑1：尝试了VGR的建议
编辑2 ： WillShackleford 的解决方案，谢谢!!!：
public NewJFrame() {
Color ACTIVE_COLOUR = Color.DARK_GRAY;
Color INACTIVE_COLOUR = Color.LIGHT_GRAY;
Font theFont = new Font("Serif",Font.PLAIN, 11);
UIManager.put("TextField.font", theFont);
UIManager.put("Button.font", theFont);
UIManager.put("ComboBox.font", theFont);
//UIManager.put("TextField.background", new ColorUIResource(ACTIVE_COLOUR));
UIManager.put("TextField.background", ACTIVE_COLOUR);
UIManager.put("TextField.foreground", INACTIVE_COLOUR);
initComponents();
List<Component> l = new ArrayList<>();
addComponents(this, l);
for(int i = 0; i < l.size(); i++) {
if (l.get(i) instanceof javax.swing.JTextField) {
javax.swing.JTextField jtf = (javax.swing.JTextField)l.get(i);
jtf.setFont(new Font("Serif",Font.PLAIN, 24));
jtf.setPreferredSize(new Dimension(jtf.getWidth(), jtf.getHeight()+10));
System.out.println("JTextField:"+", Width:"+jtf.getWidth()+", Height:"+jtf.getHeight());
}
if (l.get(i) instanceof javax.swing.JButton) {
javax.swing.JButton jb = (javax.swing.JButton)l.get(i);
jb.setPreferredSize(new Dimension(jb.getWidth(), jb.getHeight()+10));
System.out.println("JButton:"+", Width:"+jb.getWidth()+", Height:"+jb.getHeight());
}
}
}
public void addComponents(Container c, List<Component> l) {
Component ca[] = c.getComponents();
l.addAll(Arrays.asList(ca));
for (int i = 0; i < ca.length; i++) {
Component component = ca[i];
if (Container.class.isAssignableFrom(component.getClass())) {
addComponents((Container) component, l);
}
}
}
答案 0 :(得分：2)
Netbeans中的GUI编辑器可以很容易地选择任何组件集并一步更改所有属性。
如果您仍想要所有组件的列表，这似乎对我有用：
public NewJFrame() {
initComponents();
List<Component> l = new ArrayList<>();
addComponents(this, l);
System.out.println("l = " + l);
}
public void addComponents(Container c, List<Component> l) {
Component ca[] = c.getComponents();
l.addAll(Arrays.asList(ca));
for (int i = 0; i < ca.length; i++) {
Component component = ca[i];
if (Container.class.isAssignableFrom(component.getClass())) {
addComponents((Container) component, l);
}
}
}