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2025年1月1日发(作者：tcpip四层网络模型)
Java语言程序设计基础篇 课后答案-机械工业出版社
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Java语言程序设计
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[编程练习题答案]Java语言程序设计（基础篇）（进阶篇）第13、14、
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15、24、25、26、28、29、30、31章部分习题答案，奇数题和部分
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双数题是我自己做的，在此和大家分享(^_^~
Chapter 13 Exercise 13.2 / 13.8 / 13.11
import .*;
import .*;
public class Exercise13_2 extends JFrame {
// Create two buttons
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private OvalButton jbtOk = new OvalButton("OK");
private OvalButton jbtCancel = new OvalButton("Cancel");
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/** Default constructor */
public Exercise13_2() {
// Set the window title
// Set FlowLayout manager to arrange the components
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setTitle("Exercise13_2");
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// inside the frame
getContentPane().setLayout(new FlowLayout());
// Add buttons to the frame
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getContentPane().add(jbtOk);
}
/** Main method */
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getContentPane().add(jbtCancel);
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public static void main(String[] args) {
Exercise13_2 frame = new Exercise13_2();
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aultCloseOperation(_ON_CLOSE);
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();
}
}
ible(true);
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class OvalButton extends JButton {
public OvalButton() {
}
public OvalButton(String text) {
super(text);
}
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protected void paintComponent(Graphics g) {
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// Draw an oval
omponent(g);
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al(5, 5, getWidth() - 10, getHeight() - 10);
}
/** Override get method for preferredSize */
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public Dimension getPreferredSize() {
return new Dimension(100, 50);
}
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/** Override get method for minimumSize */
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public Dimension getMinimumSize() {
return new Dimension(100, 50);
}
}
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import .*;
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import .*;
public class Exercise13_8 extends JFrame {
public static void main(String[] args) {
JFrame frame = new Exercise13_8();
e(300, 300);
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le("Exercise13_8");
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aultCloseOperation(_ON_CLOSE);
ible(true);
}
public Exercise13_8() {
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getContentPane().add(new OctagonPanel());
}
}
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class OctagonPanel extends JPanel {
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protected void paintComponent(Graphics g) {
omponent(g);
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int xCenter = getWidth() / 2;
int radius =
int yCenter = getHeight() / 2;
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(int) ((getWidth(), getHeight()) * 0.4);
// Create a Polygon object
// Add points to the polygon
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Polygon polygon = new Polygon();
nt(xCenter + radius, yCenter);
nt((int)(xCenter + radius * (2 *
/ 8)),
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(int)(yCenter - radius * (2 * / 8)));
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nt((int)(xCenter + radius * (2 * 2
*
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/ 8)),
Java语言程序设计
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(int)(yCenter - radius * (2 * 2 * / 8)));
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nt((int)(xCenter + radius * (3 * 2
*
/ 8)),
(int)(yCenter - radius * (3 * 2 * / 8)));
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nt((int)(xCenter + radius * (4 * 2
*
/ 8)),
(int)(yCenter - radius * (4 * 2 * / 8)));
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nt((int)(xCenter + radius * (5 * 2
*
/ 8)),
(int)(yCenter - radius * (5 * 2 * / 8)));
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nt((int)(xCenter + radius * (6 * 2
*
/ 8)),
(int)(yCenter - radius * (6 * 2 * / 8)));
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nt((int)(xCenter + radius * (7 * 2
*
/ 8)),
(int)(yCenter - radius * (7 * 2 * / 8)));
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// Draw the polygon
}
}
import .*;
import .*;
public class Exercise13_11 extends JFrame {
public Exercise13_11(){
}
/**
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lygon(polygon);
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add(new SquareFunction());
* @param args
*/
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public static void main(String[] args) {
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// TODO 自动生成方法存根
Exercise13_11 frame = new Exercise13_11();
le("Exercise13.11");
e(300,200);
ationRelativeTo(null);
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aultCloseOperation(_ON_CLOSE);
ible(true);
}
}
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class SquareFunction extends JPanel {
public SquareFunction(){
}
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protected void paintComponent(Graphics g){
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omponent(g);
ne(10, ght()-20, th()-10,
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ght()-20);
ne(th()-30, ght()-15,
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th()-10, ght()-20);
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ne(th()-30, ght()-25,
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th()-10, ght()-20);
ring("X", th()-10,
ght()-30);
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ne(th()/2, 20, th()/2,
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ght()-5);
35);
35);
ne(th()/2, 20, th()/2-5,
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ne(th()/2, 20, th()/2+5,
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ring("Y", th()/2 + 10, 30);
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Polygon p = new Polygon();
double scaleFactor = 0.01;
for (int x=-100; x<=100; x++){
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nt(x+th()/2,
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ght()-20-(int)(scaleFactor*x*x));
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}
lyline(s, s, s);
}
}
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Chapter 14 Exercise 14.4 / 14.8 / 14.9
package chapter14;
import .*;
import .*;
import .*;
public class Exercise14_4 extends JFrame {
public Exercise14_4(){
add(p);
}
/**
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MousePosition p = new MousePosition();
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* @param args
*/
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public static void main(String[] args) {
// TODO 自动生成方法存根
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Exercise14_4 frame = new Exercise14_4();
le("Exercise14.4");
e(300, 200);
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aultCloseOperation(_ON_CLOSE);
ationRelativeTo(null);
ible(true);
}
static class MousePosi
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