我正在创建一个基本程序，即当你按空格键时会生成一个“生命栏”，当你达到最大值时，你就赢了。它每秒都会减少，所以只需垃圾邮件即可赢得空格。它试图通过java测试基本游戏。我的程序遇到了这个错误，给它一个我不熟悉的运行时错误。这是我的代码：
import javax.swing.JOptionPane;
import javax.swing.*;
import java.util.*;
import static java.lang.System.*;
import static java.lang.Math.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*; //for files
public class clicker
{
public static void main(String args[])
{
new Clicker(); //Make a window
}
}
class Clicker extends Frame implements KeyListener, MouseListener
{
// global variables
private final static int SCHEIGHT=768,SCWIDTH=1024;
// direction constants
final static int N = 0,NE = 1,E = 2,SE = 3, S = 4, SW = 5, W = 6, NW =7,STILL = 8;
// movement change constants
final int X = 0,Y = 1,Z = 2;
final int TITLE = 30, STATUS = 40;
final static int size = 2;
Image myPic;
private boolean gameNotOver = true;
private boolean keyPressed = false;
private Image myScreen;
private int whichScreen;
private int numScreen;
private int timer;
private int amt;
public Clicker()
{
setSize(SCWIDTH,SCHEIGHT);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
this.setVisible(true);
gameLoop();
}
public void gameLoop()
{
do
{
if (keyPressed)
{
amt++;
out.println(keyPressed + " " +gameNotOver+" "+ "Time "+timer);
this.repaint();
keyPressed = false;
}
if(amt >= 450)
gameNotOver = false;
this.setVisible(true);
//this.repaint();
pause(30);
}
while (gameNotOver);
if(!gameNotOver)
{
pause(5000);
System.exit(0);
}
}
public int getAmt()
{
return amt;
}
public void paint(Graphics pen)
{
if(whichScreen==0)
{
pen.drawImage(myPic,100,200,506,279,this); //Draws the image
pen.setFont(new Font("Timesroman", Font.ITALIC, 50));
pen.drawString("Welcome to the Clicker Test", 200, 75);
pen.setFont(new Font("Timesroman", Font.ITALIC, 40));
pen.drawString("Created by Cody Coulter",150,150);
pen.setFont(new Font("Timesroman", Font.ITALIC, 25));
pause(2000); // 2000 final
whichScreen++;
}
else
{
myScreen =createImage(getSize().width,getSize().height);
Graphics o = myScreen.getGraphics();
doubleBuffer(o);
pen.drawImage(myScreen,0,0,this);
}
}
public void doubleBuffer(Graphics pen) // Draws the window
{
pause (500);
numScreen++;
if (numScreen > 0)
{
setBounds(0,0,SCWIDTH,SCHEIGHT);
Color HPRed = new Color(213, 0, 0);
pen.setColor(Color.BLACK);
setTitle("Clicker Test -- Cody Coulter."+
" To click, press the space bar");
pen.setFont(new Font("Timesroman",Font.PLAIN,48));
pen.drawString("Clicker Test ",350,75);
pen.setFont(new Font("TimesRoman",Font.BOLD,33));
pen.fillRect((SCWIDTH/4), (SCHEIGHT/3), 50, 500);
pen.setColor(HPRed);
pen.fillRect((SCWIDTH/4)-5, (SCHEIGHT/3)+5, 40, amt);
if(!gameNotOver)
{
if(amt > 100)
{
pen.setColor(HPRed);
pen.fillRect(SCWIDTH/4-75, SCHEIGHT/3, SCWIDTH/2+150, SCHEIGHT/3-60);
pen.setColor(Color.GRAY);
pen.fillRect(SCWIDTH/4-65, SCHEIGHT/3+10, SCWIDTH/2+130, SCHEIGHT/3-80);
pen.setColor(Color.YELLOW);
pen.setFont(new Font("Verdana", Font.BOLD, 40));
pen.drawString("You got it!", SCWIDTH/2-290, SCHEIGHT/2-20);
}
}
this.repaint();
}
}
public void keyPressed(KeyEvent e)
{
keyPressed = true;
setTitle(""+ KeyEvent.getKeyText(e.getKeyCode()));
System.out.println("hit + "+ KeyEvent.getKeyText(e.getKeyCode())+ " " + keyPressed);
switch(e.getKeyCode())
{
case KeyEvent.VK_SPACE: amt= amt + 4;
break;
}
}
public void mouseClicked(MouseEvent m)
{
}
public void mouseEntered(MouseEvent m)
{
}
public void mouseExited(MouseEvent m)
{
}
public void mousePressed(MouseEvent m)
{
}
public void mouseReleased(MouseEvent m)
{
}
public void keyReleased(KeyEvent e)
{
}
public void keyTyped(KeyEvent e)
{
}
public void update(Graphics G)
{
paint(G);
}
public static void pause (long r)
{
try
{
Thread.sleep(r);
}
catch (Exception e)
{
out.println(" sleep error " + e);
}
}
}
我是这个论坛的新手，而且我很可能使用任意信息来解决这个特定的问题，而且我对编程很新。任何见解，或如何缩小问题将不胜感激。
同样，声明的错误是“线程中的异常”主“java.lang.NoClassDefFoundError：clicker（错误的名称：Clicker）
谢谢
答案 0 :(得分：0)
public class clicker
{
public static void main(String args[])
{
new Clicker(); //Make a window
}
}
你基本上是在宣告你的班级两次。取main函数并将其放入另一个clicker类中，然后删除小写的一个。
class Clicker extends Frame implements KeyListener, MouseListener
{
public static void main(String args[])
{
new Clicker(); //Make a window
}
//.....rest of class.....
}
答案 1 :(得分：0)
main()类应放置Clicker方法。
所以解决方案是：
class Clicker extends Frame implements KeyListener, MouseListener
{
public static void main(String args[])
{
new Clicker(); // Make a window
}
...
}
另外，请确保您的文件名为 Clicker.java ，以匹配您班级的名称。
答案 2 :(得分：0)
public Clicker(){
setSize(SCWIDTH,SCHEIGHT);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setVisible(true);
//ADD THIS
this.addKeyListener(this);
this.addMouseListener(this);
gameLoop();
}