希望有人可以提供帮助。我试图插入一个JSlider，所以它将调整字体大小，但我坚持编码。用户应输入成绩，然后在图表字段中显示该条目。完成此操作后，用户应该能够使用JSlider调整字体大小。
谢谢你的期待。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Grades extends JFrame implements ActionListener {
//INSERT SLIDER
private JTextField gradeAField = new JTextField(5);
private JTextField gradeBField = new JTextField(5);
private JTextField gradeCField = new JTextField(5);
private JTextField gradeDField = new JTextField(5);
private JTextField gradeEField = new JTextField(5);
private JTextField spaceField = new JTextField(5);
private int gradeAs;
private int gradeBs;
private int gradeCs;
private int gradeDs;
private int gradeEs;
private JButton displayChartButton = new JButton("Display bar chart");
private JButton displayClearData = new JButton("Clear Data Fields");
private JPanel chartPanel = new JPanel();
private Color chartPanelColor = Color.cyan;
private final Font labelFont = new Font("Serif", Font.BOLD, 16);
private final int chartLeftX = 30;
private final int chartTopY = 75;
private int textSpace = 30;
private int textSpaceY = 39;
int boxLeftX = 20;
int boxTopY = 50;
int displayWidth = 400;
int displayHeight = 200;
int borderPatternY = 5;
int borderPatternX = 5;
private JSlider slider;
public static void main(String[] args) {
Grades chart = new Grades();
chart.setSize(550, 550);
chart.createGUI();
chart.setVisible(true);
chart.setResizable(false);
}
private void createGUI() {
// Set up main window characteristics
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container window = getContentPane();
window.setLayout(new FlowLayout());
setTitle("Grades Calculator - 2211956");
//Sets up the Slider for the height of text.
slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 0);
window.add(slider);
// Text field for entry of number of grades As
JLabel gradeAFieldLabel = new JLabel("# of grade As:");
gradeAFieldLabel.setFont(labelFont);
window.add(gradeAFieldLabel);
window.add(gradeAField);
// Text field for entry of number of grades Bs
JLabel gradeBFieldLabel = new JLabel("# of grade Bs:");
gradeBFieldLabel.setFont(labelFont);
window.add(gradeBFieldLabel);
window.add(gradeBField);
// Text field for entry of number of grades Cs
JLabel gradeCFieldLabel = new JLabel("# of grade Cs:");
gradeCFieldLabel.setFont(labelFont);
window.add(gradeCFieldLabel);
window.add(gradeCField);
// Text field for entry of number of grades Ds
JLabel gradeDFieldLabel = new JLabel("# of grade Ds:");
gradeDFieldLabel.setFont(labelFont);
window.add(gradeDFieldLabel);
window.add(gradeDField);
// Text field for entry of number of grades Es
JLabel gradeEFieldLabel = new JLabel("# of grade Es:");
gradeEFieldLabel.setFont(labelFont);
window.add(gradeEFieldLabel);
window.add(gradeEField);
// Text field for entry of number of grades Es
JLabel spaceFieldLabel = new JLabel(" ");
spaceFieldLabel.setFont(labelFont);
window.add(spaceFieldLabel);
// Set up button to request chart display
window.add(displayChartButton);
displayChartButton.addActionListener(this);
// set up button to request clear data field
window.add(displayClearData);
displayClearData.addActionListener(this);
// Set up the panel for drawing on
chartPanel.setPreferredSize(new Dimension(450, 300));
chartPanel.setBackground(chartPanelColor);
window.add(chartPanel);
}
public static void changeFont(Component component, int fontSize) {
Font f = component.getFont();
component.setFont(new Font(f.getName(), f.getStyle(), f.getSize() + fontSize));
if (component instanceof Container) {
for (Component child : ((Container) component).getComponents()) {
changeFont(child, fontSize);
}
}
}
public void actionPerformed(ActionEvent e) {
{
Graphics g = chartPanel.getGraphics();
g.drawRect(boxLeftX, boxTopY, displayWidth, displayHeight);
for (int count = 0; borderPatternX < displayHeight; count++) {
//draws horizontal lines
g.drawLine(boxLeftX, borderPatternX + boxTopY, boxLeftX + displayWidth, borderPatternX + boxTopY);
borderPatternX = borderPatternX + 5;
}
for (int horizontal = 0; borderPatternY < displayWidth; horizontal++) {
// draws vertical lines
g.drawLine(borderPatternY + boxLeftX, boxTopY, borderPatternY + boxLeftX, boxTopY + displayHeight);
borderPatternY = borderPatternY + 5;
}
g.setColor(Color.white);
g.fillRect(boxLeftX + 5, boxTopY + 5, displayWidth - 10, displayHeight - 10);
g.setColor(Color.black);
g.drawLine(boxLeftX + 5, (boxTopY + 5) + 38, (boxLeftX + displayWidth - 5), (boxTopY + 5) + 38);
g.drawLine(boxLeftX + 5, (boxTopY + 5) + 76, (boxLeftX + displayWidth - 5), (boxTopY + 5) + 76);
g.drawLine(boxLeftX + 5, (boxTopY + 5) + 114, (boxLeftX + displayWidth - 5), (boxTopY + 5) + 114);
g.drawLine(boxLeftX + 5, (boxTopY + 5) + 152, (boxLeftX + displayWidth - 5), (boxTopY + 5) + 152);
}
if (e.getSource() == displayChartButton) {
checkAndRecordData();
Graphics g = chartPanel.getGraphics();
g.setColor(Color.black);
for (int i = 0; i < gradeAs; i++) {
g.drawString("A", chartLeftX + textSpace * i, chartTopY);
}
}
if (e.getSource() == displayChartButton) {
checkAndRecordData();
Graphics g = chartPanel.getGraphics();
g.setColor(Color.black);
for (int i = 0; i < gradeBs; i++) {
g.drawString("B", chartLeftX + textSpace * i, chartTopY + textSpaceY);
}
}
if (e.getSource() == displayChartButton) {
checkAndRecordData();
Graphics g = chartPanel.getGraphics();
g.setColor(Color.black);
for (int i = 0; i < gradeCs; i++) {
g.drawString("C", chartLeftX + textSpace * i, chartTopY + textSpaceY * 2);
}
}
if (e.getSource() == displayChartButton) {
checkAndRecordData();
Graphics g = chartPanel.getGraphics();
g.setColor(Color.black);
for (int i = 0; i < gradeDs; i++) {
g.drawString("D", chartLeftX + textSpace * i, chartTopY + textSpaceY * 3);
}
}
if (e.getSource() == displayChartButton) {
checkAndRecordData();
Graphics g = chartPanel.getGraphics();
g.setColor(Color.black);
for (int i = 0; i < gradeEs; i++) {
g.drawString("E", chartLeftX + textSpace * i, chartTopY + textSpaceY * 4);
}
}
if (e.getSource() == displayClearData) {
checkAndRecordData();
gradeAField.setText("");
gradeBField.setText("");
gradeCField.setText("");
gradeDField.setText("");
gradeEField.setText("");
chartPanel.repaint();
}
}
private void checkAndRecordData() {
int tempAs = 0;
tempAs = Integer.parseInt(gradeAField.getText());
gradeAs = tempAs;
int tempBs = 0;
tempBs = Integer.parseInt(gradeBField.getText());
gradeBs = tempBs;
int tempCs = 0;
tempCs = Integer.parseInt(gradeCField.getText());
gradeCs = tempCs;
int tempDs = 0;
tempDs = Integer.parseInt(gradeDField.getText());
gradeDs = tempDs;
int tempEs = 0;
tempEs = Integer.parseInt(gradeEField.getText());
gradeEs = tempEs;
}
public void stateCahnged(ChangeEvent e) {
int fontSize = sliderFontSet.getValue();
if (!((JSlider) e.getSource()).getValueIsAdjusting()) {
changeFont(this, sliderFontSet.getValue() - slider);
slider = sliderFontSet.getValue();
}
}
}
答案 0 :(得分：0)
你的上一个功能
public void stateCahnged(ChangeEvent e) {
int fontSize = sliderFontSet.getValue();
if (!((JSlider) e.getSource()).getValueIsAdjusting()) {
changeFont(this, sliderFontSet.getValue() - slider);
slider = sliderFontSet.getValue();
}
}
拼写错误？也许是因为姓名不正确而被调用。