我正在学习自己编写java程序,我正在尝试制作一个健康栏,健康状况显示但是当我按下“向上”按钮时(我正在制作一个简单的2D游戏的骨架,该按钮只是为了知道命令)健康状况不会下降。当我按下按钮3次,这显示在我的cmd:
这是我的代码:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class test{
private static JFrame frame = new JFrame("test");
private static JPanel panel = new JPanel();
private static JPanel panel1 = new JPanel();
private static JPanel panel2 = new JPanel();
private static JButton button1 = new JButton("UP");
private static JButton button2 = new JButton("DN");
private static JButton button3 = new JButton("L");
private static JButton button4 = new JButton("R");
private static JLabel background = new JLabel(new ImageIcon("C:\\Users\\beau\\Downloads\\background.jpg"));
private static int startHealth = 20;
private static int healthBoost = 0;
private static int maxHealth = startHealth + healthBoost;
private static int damage = 0;
private static int damageTaken;
private static int curentHealth;
public static void main(String[] args){
//JFrame Properties
frame.setSize(900,600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setVisible(true);
//shown stuff Properties and Adding
damageTaken += damage;
curentHealth = maxHealth - damageTaken;
JProgressBar health = new JProgressBar(0,curentHealth);
health.setStringPainted(true);
health.setString(curentHealth + "/" + maxHealth);
health.setValue(curentHealth);
frame.add(background);
panel.setLayout(null);
background.setLayout(null);
button1.setBounds(61,420,50,50);
button2.setBounds(61,520,50,50);
button3.setBounds(11,470,50,50);
button4.setBounds(111,470,50,50);
panel.setBounds(725,0,175,600);
health.setBounds(10,20,150,20);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(health);
background.add(panel);
button1.addActionListener (new Action1());
background.revalidate();
}
static class Action1 implements ActionListener{
public void actionPerformed (ActionEvent e){
damage = 5;
main(new String[] {"a","b","c"});
}
}
static class Action2 implements ActionListener{
public void actionPerformed (ActionEvent e){
}
}
static class ActionReset implements ActionListener{
public void actionPerformed (ActionEvent e){
}
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class test{
private static JFrame frame = new JFrame("test");
private static JPanel panel = new JPanel();
private static JPanel panel1 = new JPanel();
private static JPanel panel2 = new JPanel();
private static JButton button1 = new JButton("UP");
private static JButton button2 = new JButton("DN");
private static JButton button3 = new JButton("L");
private static JButton button4 = new JButton("R");
private static JLabel background = new JLabel(new ImageIcon("C:\\Users\\beau\\Downloads\\background.jpg"));
private static int startHealth = 20;
private static int healthBoost = 0;
private static int maxHealth = startHealth + healthBoost;
private static int damage = 0;
private static int damageTaken;
private static int curentHealth;
public static void main(String[] args){
//JFrame Properties
frame.setSize(900,600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setVisible(true);
//shown stuff Properties and Adding
damageTaken += damage;
curentHealth = maxHealth - damageTaken;
JProgressBar health = new JProgressBar(0,curentHealth);
health.setStringPainted(true);
health.setString(curentHealth + "/" + maxHealth);
health.setValue(curentHealth);
frame.add(background);
panel.setLayout(null);
background.setLayout(null);
button1.setBounds(61,420,50,50);
button2.setBounds(61,520,50,50);
button3.setBounds(11,470,50,50);
button4.setBounds(111,470,50,50);
panel.setBounds(725,0,175,600);
health.setBounds(10,20,150,20);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(health);
background.add(panel);
button1.addActionListener (new Action1());
background.revalidate();
}
static class Action1 implements ActionListener{
public void actionPerformed (ActionEvent e){
damage = 5;
main(new String[] {"a","b","c"});
}
}
static class Action2 implements ActionListener{
public void actionPerformed (ActionEvent e){
}
}
static class ActionReset implements ActionListener{
public void actionPerformed (ActionEvent e){
}
}
}
我在stackoverflow.com上搜索谷歌和很多但我没有发现任何看起来像我的问题的问题。有人可以帮我解决这个问题吗?
答案 0 :(得分:1)
如果最大值低于最小值,则会收到以下异常:
new JProgressBar(0,-5);
请参阅此代码:
/**
* Initializes value, extent, minimum and maximum. Adjusting is false.
* Throws an <code>IllegalArgumentException</code> if the following
* constraints aren't satisfied:
* <pre>
* min <= value <= value+extent <= max
* </pre>
*/
public DefaultBoundedRangeModel(int value, int extent, int min, int max)
{
if ((max >= min) &&
(value >= min) &&
((value + extent) >= value) &&
((value + extent) <= max)) {
this.value = value;
this.extent = extent;
this.min = min;
this.max = max;
}
else {
throw new IllegalArgumentException("invalid range properties");
}
}