如何更改此Java Applet以使用JPanel？
如何将其更改为JPanel，此代码在Java Applet中如何更改？
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import java.lang.reflect.Array;
public class Hangman extends Applet implements ActionListener{
static final int DEAD=13; // amount of errors till loss
private int errors; // amount of errors
private String message; // error or victorie
private String information; // information of the message
private String rword; // the rword
private StringBuffer gword;// the gword
private Button bStart; // Button "Restart"
private Button bGo; // Button "Go"
private TextField tfLetter; // letter box
private Font fnt; // common font
public void init(){
fnt = new Font( "Monospaced", 20, 20 );
setFont(fnt);
// Create textbox for guess letter
tfLetter = new TextField();
// Create buttons and labels
bStart = new Button("Restart");
bGo = new Button("Go");
// Add the graphical elements to the applet
add(bStart);
add(new Label("Guess a letter:"));
add(tfLetter);
add(bGo);
// Buttons are events:
bStart.addActionListener(this);
bGo.addActionListener(this);
// Start first game
initGame();
}
public void initGame(){
/* Setting the errors to 0 */
errors=0;
/* Enter the wordslist, separated by a | here: */
String str = "computer|radio|calculator|teacher|bureau|police|geometry|president|subject|country|enviroment|classroom|animals|province|month|politics|puzzle|instrument|kitchen|language|vampire|ghost|solution|service|software|virus25|security|phonenumber|expert|website|agreement|support|compatibility|advanced|search|triathlon|immediately|encyclopedia|endurance|distance|nature|history|organization|international|championship|government|popularity|thousand|feature|wetsuit|fitness|legendary|variation|equal|approximately|segment|priority|physics|branche|science|mathematics|lightning|dispersion|accelerator|detector|terminology|design|operation|foundation|application|prediction|reference|measurement|concept|perspective|overview|position|airplane|symmetry|dimension|toxic|algebra|illustration|classic|verification|citation|unusual|resource|analysis|license|comedy|screenplay|production|release|emphasis|director|trademark|vehicle|aircraft|experiment";
String[] temp;
/* delimiter */
String delimiter = "\\|";
/* given string will be split by the argument delimiter provided. */
temp = str.split(delimiter);
/* Setting the seed */
Random randomGenerator = new Random();
/* Generating random number */
int randomInt = randomGenerator.nextInt(temp.length);
rword = new String(temp[randomInt]);
char positions[] = new char[rword.length()];
for (int i=0; i<rword.length(); i++) {
positions[i] = '.';
}
String s = new String(positions);
gword = new StringBuffer(s);
tfLetter.setText("");
// Delete the messages
message="";
information = "";
repaint();
}
public void paint(Graphics g) {
// Draw the hangman
int baseY = 250;
if (errors > 0){ // ground
g.drawLine(90, baseY,200,baseY);
}
if (errors > 1){ // bar up
g.drawLine(125,baseY,125,baseY-100);
}
if (errors > 2){
g.drawLine(110,baseY,125,baseY-15);
}
if (errors > 3){
g.drawLine(140,baseY,125,baseY-15);
}
if (errors > 4){ // side bar
g.drawLine(125,baseY-100,175,baseY-100);
}
if (errors > 5){
g.drawLine(125,baseY-85,140,baseY-100);
}
if (errors > 6){ // rope
g.drawLine(175,baseY-100,175,baseY-75);
}
if (errors > 7){ // body
g.drawOval(170,baseY-75,10,12);
}
if (errors > 8){
g.drawOval(170,baseY-65,15,25);
}
if (errors > 9){ // arms
g.drawLine(160,baseY-65,170,baseY-60);
}
if (errors > 10){
g.drawLine(183,baseY-60,193,baseY-65);
}
if (errors > 11){ // legs
g.drawLine(165,baseY-30,170,baseY-45);
}
if (errors > 12){
g.drawLine(183,baseY-45,193,baseY-30);
}
// Show the messages
g.drawString( message, 40, baseY+25 );
g.drawString( information, 25, baseY+45 );
g.drawString( new String (gword), 110, 60);
}
public void actionPerformed(ActionEvent e){
if (e.getSource() == bStart){
initGame();
}
if (e.getSource() == bGo){
processTurn();
// Delete the letter input box
tfLetter.setText("");
repaint();
}
}
private void processTurn(){
String s, t;
char a;
s = tfLetter.getText();
a = s.charAt(0);
if (!Character.isLetter(a)){
message="Only enter letters!";
return;
}
if (s.length()>1){
message="One letter at a time!";
return;
}
// Has the letter been guessed
t = new String(gword);
if (t.indexOf(s) != -1){
message="Letter has already been guessed";
return;
}
// If the letter doesn't occur in the rword
if (rword.indexOf(s) == -1){
message="";
errors++;
if (errors==DEAD){
message="You lost!";
information =
"Click on restart for another chance!";
}
return;
}
// Replace dots in gword with the found letter.
for (int i=0; i<rword.length(); i++){
if (rword.charAt(i) == a){
gword.setCharAt(i, a);
}
}
t = new String(gword);
// If all the dots have been filled, you win
if (t.indexOf('.') == -1){
message="You win!";
return;
}
// Delete message
message="";
repaint();
}
}
2 个答案:
答案 0 :(得分：1)
替换此行：
public class Hangman extends Applet implements ActionListener{
通过以下方式：
public class Hangman extends JPanel implements ActionListener{
Applet扩展了扩展Container的Panel。 JPanel也间接地扩展了Container。方法add()在容器中声明。
所以，你唯一需要做的就是自己打电话给init()。当applet是java插件时，这个方法被java插件调用。
JPanel yourGame = new Hangman（）; yourGame.init（）;
顺便说一句，你甚至不必让你的游戏扩展JPanel。你想在单独的框架中运行它？在这种情况下，请执行以下操作：
Frame f - new Frame();
Panel yourGame = new Hangman();
yourGame.init();
f.add(yourGame);
f.setSize(300, 300);
f.setVisible(true);
就是这样。这将创建框架并将您的applet（即面板）放在框架的中间。
答案 1 :(得分：1)
查看无数小变化的代码。请注意，我从游戏中删除了第二个按钮，而是将动作侦听器直接添加到文本字段中。
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
import java.lang.reflect.Array;
public class Hangman extends JPanel implements ActionListener{
static final int DEAD=13; // amount of errors till loss
private int errors; // amount of errors
private String message; // error or victorie
private String information; // information of the message
private String rword; // the rword
private StringBuffer gword;// the gword
private JButton bStart; // Button "Restart"
private JTextField tfLetter; // letter box
private Font fnt; // common font
Hangman() {
fnt = new Font( "Monospaced", 20, 20 );
setFont(fnt);
// Create textbox for guess letter
tfLetter = new JTextField(4);
// Create buttons and labels
bStart = new JButton("Restart");
//bGo = new JButton("Go");
// Add the graphical elements to the applet
setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
add(bStart);
add(new JLabel("Guess a letter:"));
add(tfLetter);
// Buttons are events:
bStart.addActionListener(this);
tfLetter.addActionListener(this);
validate();
// Start first game
initGame();
setPreferredSize(new Dimension(300,300));
}
public void initGame(){
/* Setting the errors to 0 */
errors=0;
/* Enter the wordslist, separated by a | here: */
String str = "computer|radio|calculator|teacher|bureau|police|geometry|president|subject|country|enviroment|classroom|animals|province|month|politics|puzzle|instrument|kitchen|language|vampire|ghost|solution|service|software|virus25|security|phonenumber|expert|website|agreement|support|compatibility|advanced|search|triathlon|immediately|encyclopedia|endurance|distance|nature|history|organization|international|championship|government|popularity|thousand|feature|wetsuit|fitness|legendary|variation|equal|approximately|segment|priority|physics|branche|science|mathematics|lightning|dispersion|accelerator|detector|terminology|design|operation|foundation|application|prediction|reference|measurement|concept|perspective|overview|position|airplane|symmetry|dimension|toxic|algebra|illustration|classic|verification|citation|unusual|resource|analysis|license|comedy|screenplay|production|release|emphasis|director|trademark|vehicle|aircraft|experiment";
String[] temp;
/* delimiter */
String delimiter = "\\|";
/* given string will be split by the argument delimiter provided. */
temp = str.split(delimiter);
/* Setting the seed */
Random randomGenerator = new Random();
/* Generating random number */
int randomInt = randomGenerator.nextInt(temp.length);
rword = new String(temp[randomInt]);
char positions[] = new char[rword.length()];
for (int i=0; i<rword.length(); i++) {
positions[i] = '.';
}
String s = new String(positions);
gword = new StringBuffer(s);
tfLetter.setText("");
// Delete the messages
message="";
information = "";
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draw the hangman
int baseY = 250;
if (errors > 0){ // ground
g.drawLine(90, baseY,200,baseY);
}
if (errors > 1){ // bar up
g.drawLine(125,baseY,125,baseY-100);
}
if (errors > 2){
g.drawLine(110,baseY,125,baseY-15);
}
if (errors > 3){
g.drawLine(140,baseY,125,baseY-15);
}
if (errors > 4){ // side bar
g.drawLine(125,baseY-100,175,baseY-100);
}
if (errors > 5){
g.drawLine(125,baseY-85,140,baseY-100);
}
if (errors > 6){ // rope
g.drawLine(175,baseY-100,175,baseY-75);
}
if (errors > 7){ // body
g.drawOval(170,baseY-75,10,12);
}
if (errors > 8){
g.drawOval(170,baseY-65,15,25);
}
if (errors > 9){ // arms
g.drawLine(160,baseY-65,170,baseY-60);
}
if (errors > 10){
g.drawLine(183,baseY-60,193,baseY-65);
}
if (errors > 11){ // legs
g.drawLine(165,baseY-30,170,baseY-45);
}
if (errors > 12){
g.drawLine(183,baseY-45,193,baseY-30);
}
// Show the messages
g.drawString( message, 40, baseY+25 );
g.drawString( information, 25, baseY+45 );
g.drawString( new String (gword), 110, 60);
}
public void actionPerformed(ActionEvent e){
if (e.getSource() == bStart){
initGame();
}
if (e.getSource().equals(tfLetter)){
processTurn();
// Delete the letter input box
tfLetter.setText("");
repaint();
}
}
private void processTurn(){
String s, t;
char a;
s = tfLetter.getText();
a = s.charAt(0);
if (!Character.isLetter(a)){
message="Only enter letters!";
return;
}
if (s.length()>1){
message="One letter at a time!";
return;
}
// Has the letter been guessed
t = new String(gword);
if (t.indexOf(s) != -1){
message="Letter has already been guessed";
return;
}
// If the letter doesn't occur in the rword
if (rword.indexOf(s) == -1){
message="";
errors++;
if (errors==DEAD){
message="You lost!";
information =
"Click on restart for another chance!";
}
return;
}
// Replace dots in gword with the found letter.
for (int i=0; i<rword.length(); i++){
if (rword.charAt(i) == a){
gword.setCharAt(i, a);
}
}
t = new String(gword);
// If all the dots have been filled, you win
if (t.indexOf('.') == -1){
message="You win!";
return;
}
// Delete message
message="";
repaint();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JPanel hangman = new Hangman();
JOptionPane.showMessageDialog(null, hangman);
}
});
}
}
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