问题：
阻止Java GUI组件调整大小*紧急分配[关闭]
孙自怡
要防止组件调整大小，请使用FlowLayout将组件添加到JPanel，然后将该面板添加到BorderLayout。这是防止调整大小的常用方法。FlowLayout面板将拉伸，但其中的组件不会拉伸我发现了这一点，但我对代码的实用性有困难。
public class abdul {
public static void main(String[] args) {
JFrame frame = new FutureValueFrame();
frame.setVisible(true);
}
}
class FutureValueFrame extends JFrame {
public FutureValueFrame() {
setTitle("Loan Calculator");
setSize(300, 300);
centerWindow(this);
setResizable(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new FutureValuePanel();
this.add(panel);
}
private void centerWindow(Window w) {
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
setLocation((d.width - w.getWidth()) / 2, (d.height - w.getHeight()) / 2);
}
}
class FutureValuePanel extends JPanel implements ActionListener {
private JTextField paymentText, rateText, yearsText, loanText;
private JLabel paymentLabel, rateLabel, yearsLabel, loanLabel;
private JButton calculateButton, exitButton, paymentButton, loanButton;
private int counter = 0;
public FutureValuePanel() { // display panel
JPanel displayPanel = new JPanel();
displayPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
loanLabel = new JLabel("Loan Amount:");
displayPanel.add(loanLabel);
//hello
loanText = new JTextField(10);
displayPanel.add(loanText);
//////
///////
rateLabel = new JLabel("Yearly Interest Rate:");
displayPanel.add(rateLabel);
rateText = new JTextField(10);
displayPanel.add(rateText);
////////
yearsLabel = new JLabel("Number of Years:");
displayPanel.add(yearsLabel);
yearsText = new JTextField(10);
displayPanel.add(yearsText);
////////
paymentLabel = new JLabel("Monthly Payment:");
displayPanel.add(paymentLabel);
//hello
paymentText = new JTextField(10);
displayPanel.add(paymentText);
// button panel
JPanel buttonPanel = new JPanel();
JPanel alphaPanel = new JPanel();
;
buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
alphaPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// calculate button
calculateButton = new JButton("Calculate");
calculateButton.addActionListener(this);
buttonPanel.add(calculateButton);
paymentButton = new JButton("Monthly Payment");
paymentButton.addActionListener(this);
alphaPanel.add(paymentButton);
loanButton = new JButton("Loan Amount");
loanButton.addActionListener(this);
alphaPanel.add(loanButton);
// exit button
exitButton = new JButton("Exit");
exitButton.addActionListener(this);
buttonPanel.add(exitButton);
// add panels to main panel
this.setLayout(new BorderLayout());
this.add(displayPanel, BorderLayout.CENTER);
this.add(buttonPanel, BorderLayout.SOUTH);
this.add(alphaPanel, BorderLayout.NORTH);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == exitButton) {
System.exit(0);
}
if (source == loanButton) {
loanText.setEditable(false);
loanText.setFocusable(false);
loanText.setText(null);
paymentText.setEditable(true);
paymentText.setFocusable(true);
counter = 1;
}
if (source == paymentButton) {
paymentText.setEditable(false);
paymentText.setFocusable(false);
paymentText.setText(null);
loanText.setEditable(true);
loanText.setFocusable(true);
counter = 2;
}
if (source == calculateButton) {
NumberFormat currency = NumberFormat.getCurrencyInstance();
// paymentText.setText(currency.format(Double.parseDouble(loanText.getText())));
//
// paymentText.setText(the);
//loanText.setText(" ");
// paymentText.setText(" ");
if (counter == 1) {
Double rate = Double.parseDouble(rateText.getText());
Double years = Double.parseDouble(yearsText.getText());
Double payment = Double.parseDouble(paymentText.getText());
String result = currency.format(((1 - (1 / (Math.pow((1 + (rate / 12)), (years * 12))))) * payment * 12) / rate);
loanText.setText(result.substring(1));
}
if (counter == 2) {
Double loan = Double.parseDouble(loanText.getText());
Double rate = Double.parseDouble(rateText.getText());
Double years = Double.parseDouble(yearsText.getText());
String retur = currency.format(((loan * (rate / 12)) / (1 - (1 / (Math.pow((1 + (rate / 12)), (years * 12)))))));
paymentText.setText(retur.substring(1));
}
}
}
}
共有1个答案
麻学博
只需使用更合适的布局管理器。。。
问题不在于面板大小的调整，而是布局管理器处理该事件的方式
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class BadLayout {
public static void main(String[] args) {
new BadLayout();
}
public BadLayout() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new FutureValueFrame();
frame.setVisible(true);
}
});
}
public class FutureValueFrame extends JFrame {
public FutureValueFrame() {
setTitle("Loan Calculator");
centerWindow(this);
setResizable(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new FutureValuePanel();
this.add(panel);
pack();
}
private void centerWindow(Window w) {
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
setLocation((d.width - w.getWidth()) / 2, (d.height - w.getHeight()) / 2);
}
}
class FutureValuePanel extends JPanel implements ActionListener {
private JTextField paymentText, rateText, yearsText, loanText;
private JLabel paymentLabel, rateLabel, yearsLabel, loanLabel;
private JButton calculateButton, exitButton, paymentButton, loanButton;
private int counter = 0;
public FutureValuePanel() {
JPanel displayPanel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(4, 4, 4, 4);
loanLabel = new JLabel("Loan Amount:");
displayPanel.add(loanLabel, gbc);
//hello
gbc.gridx++;
loanText = new JTextField(10);
displayPanel.add(loanText, gbc);
//////
gbc.gridx++;
///////
rateLabel = new JLabel("Yearly Interest Rate:");
displayPanel.add(rateLabel, gbc);
gbc.gridx++;
rateText = new JTextField(10);
displayPanel.add(rateText, gbc);
////////
gbc.gridx = 0;
gbc.gridy = 1;
yearsLabel = new JLabel("Number of Years:");
displayPanel.add(yearsLabel, gbc);
gbc.gridx++;
yearsText = new JTextField(10);
displayPanel.add(yearsText, gbc);
////////
gbc.gridx++;
paymentLabel = new JLabel("Monthly Payment:");
displayPanel.add(paymentLabel, gbc);
//hello
gbc.gridx++;
paymentText = new JTextField(10);
displayPanel.add(paymentText, gbc);
// button panel
JPanel buttonPanel = new JPanel();
JPanel alphaPanel = new JPanel();
buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
alphaPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// calculate button
calculateButton = new JButton("Calculate");
calculateButton.addActionListener(this);
buttonPanel.add(calculateButton);
paymentButton = new JButton("Monthly Payment");
paymentButton.addActionListener(this);
alphaPanel.add(paymentButton);
loanButton = new JButton("Loan Amount");
loanButton.addActionListener(this);
alphaPanel.add(loanButton);
// exit button
exitButton = new JButton("Exit");
exitButton.addActionListener(this);
buttonPanel.add(exitButton);
// add panels to main panel
this.setLayout(new BorderLayout());
this.add(displayPanel, BorderLayout.CENTER);
this.add(buttonPanel, BorderLayout.SOUTH);
this.add(alphaPanel, BorderLayout.NORTH);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == exitButton) {
System.exit(0);
}
if (source == loanButton) {
loanText.setEditable(false);
loanText.setFocusable(false);
loanText.setText(null);
paymentText.setEditable(true);
paymentText.setFocusable(true);
counter = 1;
}
if (source == paymentButton) {
paymentText.setEditable(false);
paymentText.setFocusable(false);
paymentText.setText(null);
loanText.setEditable(true);
loanText.setFocusable(true);
counter = 2;
}
if (source == calculateButton) {
NumberFormat currency = NumberFormat.getCurrencyInstance();
if (counter == 1) {
Double rate = Double.parseDouble(rateText.getText());
Double years = Double.parseDouble(yearsText.getText());
Double payment = Double.parseDouble(paymentText.getText());
String result = currency.format(((1 - (1 / (Math.pow((1 + (rate / 12)), (years * 12))))) * payment * 12) / rate);
loanText.setText(result.substring(1));
}
if (counter == 2) {
Double loan = Double.parseDouble(loanText.getText());
Double rate = Double.parseDouble(rateText.getText());
Double years = Double.parseDouble(yearsText.getText());
String retur = currency.format(((loan * (rate / 12)) / (1 - (1 / (Math.pow((1 + (rate / 12)), (years * 12)))))));
paymentText.setText(retur.substring(1));
}
}
}
}
}
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