为何图形会不一样
日期：2014-05-20 浏览次数：20818 次
为什么图形会不一样
这是最先的代码，运行后两个按钮的大小是一样的
package FiveTeen;
import javax.swing.*;
import java.awt.*;
public class Exercise15_2 extends JFrame {
// Create two buttons
private OvalButton jbtOk = new OvalButton("OK");
private OvalButton jbtCancel = new OvalButton("Cancel");
/** Default constructor */
public Exercise15_2() {
// Set FlowLayout manager to arrange the components
// inside the frame
setLayout(new FlowLayout());
// Add buttons to the frame
add(jbtOk);
add(jbtCancel);
}
/** Main method */
public static void main(String[] args) {
Exercise15_2 frame = new Exercise15_2();
frame.setTitle("Exercise15_2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(100, 80);
frame.setLocationRelativeTo(null); // Center the frame
frame.setVisible(true);
}
}
class OvalButton extends JButton {
public OvalButton() {
}
public OvalButton(String text) {
super(text);
}
protected void paintComponent(Graphics g) {
// Draw an oval
super.paintComponent(g);
g.drawOval(5, 5, getWidth() - 10, getHeight() - 10);
}
/** Override get method for preferredSize */
public Dimension getPreferredSize() {
return new Dimension(100, 50);
}
/** Override get method for minimumSize */
public Dimension getMinimumSize() {
return new Dimension(100, 50);
}
}
这是最先的代码，运行后两个按钮的大小是一样的
package FiveTeen;
import javax.swing.*;
import java.awt.*;
public class Exercise15_2 extends JFrame {
// Create two buttons
private OvalButton jbtOk = new OvalButton("OK");
private OvalButton jbtCancel = new OvalButton("Cancel");
/** Default constructor */
public Exercise15_2() {
// Set FlowLayout manager to arrange the components
// inside the frame
setLayout(new FlowLayout());
// Add buttons to the frame
add(jbtOk);
add(jbtCancel);
}
/** Main method */
public static void main(String[] args) {
Exercise15_2 frame = new Exercise15_2();
frame.setTitle("Exercise15_2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(100, 80);
frame.setLocationRelativeTo(null); // Center the frame
frame.setVisible(true);
}
}
class OvalButton extends JButton {
public OvalButton() {
}
public OvalButton(String text) {
super(text);
}
protected void paintComponent(Graphics g) {
// Draw an oval
super.paintComponent(g);
g.drawOval(5, 5, getWidth() - 10, getHeight() - 10);
}
// /** Override get method for preferredSize */
// public Dimension getPreferredSize() {
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