我需要一些帮助，将JFrame的标题栏图标设置为我计算机中的图像。
我意识到计算器不完整。我仍然需要添加操作，但我只是想先这样做。
如果你能专注于实际问题，那就太惊人了。请不要提出类似设置特定CLASSPATH的建议。我想使用相对位置和排序从我的计算机中获取图片而不使用。我之前尝试过使用相对位置，但是失败了。
此程序正在 BlueJ 上完成，原因仅限于个人偏好。
图像尝试的代码在Calculator方法下......
文件路径为＆＃34; C：/Users/Charlie/Downloads/smiley.png ＆＃34;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.BorderFactory.*;
import java.lang.*;
public class Calculator{
JFrame f = new JFrame("Calculator");
private String word = "";
JTextField tf = new JTextField("0");
public static void main(){
Calculator Run = new Calculator();
}
public Calculator(){
//URL url = new URL("file:/C:/Users/Charlie/Downloads/smiley.png");
try{
javax.swing.UIManager.setLookAndFeel(new
com.sun.java.swing.plaf.windows.WindowsLookAndFeel());
}catch(Exception e){}
ImageIcon img = new ImageIcon("file:/C:/Users/Charlie/Downloads/smiley.png");
f.setIconImage(img.getImage());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
JButton one, two, three, four, five, six, seven, eight, nine, zero, back, ce;
one = new JButton("1");
two = new JButton("2");
three = new JButton("3");
four = new JButton("4");
five = new JButton("5");
six = new JButton("6");
seven = new JButton("7");
eight = new JButton("8");
nine = new JButton("9");
zero = new JButton("0");
back = new JButton("<-");
ce = new JButton("CE");
one.setPreferredSize(new Dimension(50, 40));
two.setPreferredSize(new Dimension(50, 40));
three.setPreferredSize(new Dimension(50, 40));
four.setPreferredSize(new Dimension(50, 40));
five.setPreferredSize(new Dimension(50, 40));
six.setPreferredSize(new Dimension(50, 40));
seven.setPreferredSize(new Dimension(50, 40));
eight.setPreferredSize(new Dimension(50, 40));
nine.setPreferredSize(new Dimension(50, 40));
zero.setPreferredSize(new Dimension(50, 40));
back.setPreferredSize(new Dimension(50, 40));
ce.setPreferredSize(new Dimension(50, 40));
one.setActionCommand("1");
two.setActionCommand("2");
three.setActionCommand("3");
four.setActionCommand("4");
five.setActionCommand("5");
six.setActionCommand("6");
seven.setActionCommand("7");
eight.setActionCommand("8");
nine.setActionCommand("9");
zero.setActionCommand("0");
back.setActionCommand("back");
ce.setActionCommand("ce");
one.addActionListener(al);
two.addActionListener(al);
three.addActionListener(al);
four.addActionListener(al);
five.addActionListener(al);
six.addActionListener(al);
seven.addActionListener(al);
eight.addActionListener(al);
nine.addActionListener(al);
zero.addActionListener(al);
back.addActionListener(al);
ce.addActionListener(al);
one.addKeyListener(kl);
two.addKeyListener(kl);
three.addKeyListener(kl);
four.addKeyListener(kl);
five.addKeyListener(kl);
six.addKeyListener(kl);
seven.addKeyListener(kl);
eight.addKeyListener(kl);
nine.addKeyListener(kl);
zero.addKeyListener(kl);
back.addKeyListener(kl);
ce.addKeyListener(kl);
f.addKeyListener(kl);
tf.setPreferredSize(new Dimension(130, 25));
tf.setEditable(false);
tf.setHorizontalAlignment(JTextField.RIGHT);
TitledBorder t0, t1, t2;
t0 = BorderFactory.createTitledBorder(" Input ");
t1 = BorderFactory.createTitledBorder(" Operations ");
t2 = BorderFactory.createTitledBorder(" Output ");
JPanel p0, p1, p2, p3, p4, p5, p6;
p0 = new JPanel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
p6 = new JPanel();
p0.add(tf);
p0.setBorder(t2);
p1.add(one); p1.add(two); p1.add(three);
p2.add(four); p2.add(five); p2.add(six);
p3.add(seven); p3.add(eight); p3.add(nine);
p4.add(ce);p4.add(zero); p4.add(back);
p5.add(p1); p5.add(p2); p5.add(p3); p5.add(p4);
p5.setLayout(new BoxLayout(p5, BoxLayout.PAGE_AXIS));
p5.setBorder(t0);
p6.add(p0); p6.add(p5);
p6.setLayout(new BoxLayout(p6, BoxLayout.PAGE_AXIS));
p6.addKeyListener(kl);
f.add(p6);
f.pack();
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
f.setLocation(dim.width/2 - f.getSize().width/2, dim.height/2 - f.getSize().height/2);
f.setVisible(true);
}
KeyListener kl = new KeyAdapter(){
public void keyPressed(KeyEvent e){
if(word.length() == 1 && word.equals("0")){
word = "";
}
if(e.getKeyCode() == KeyEvent.VK_1)
word += "1";
else if(e.getKeyCode() == KeyEvent.VK_2)
word += "2";
else if(e.getKeyCode() == KeyEvent.VK_3)
word += "3";
else if(e.getKeyCode() == KeyEvent.VK_4)
word += "4";
else if(e.getKeyCode() == KeyEvent.VK_5)
word += "5";
else if(e.getKeyCode() == KeyEvent.VK_6)
word += "6";
else if(e.getKeyCode() == KeyEvent.VK_7)
word += "7";
else if(e.getKeyCode() == KeyEvent.VK_8)
word += "8";
else if(e.getKeyCode() == KeyEvent.VK_9)
word += "9";
else if(e.getKeyCode() == KeyEvent.VK_0)
word += "0";
else if(word.length() > 1 && e.getKeyCode() == KeyEvent.VK_BACK_SPACE){
word = word.substring(0, word.length()-1);
}
else if((word.length() == 1 && e.getKeyCode() == KeyEvent.VK_BACK_SPACE) ||
e.getKeyCode() == KeyEvent.VK_CONTROL ||
(word.length() == 0 && e.getKeyCode() == KeyEvent.VK_BACK_SPACE))
word = "0";
else
word = word;
tf.setText(word);
}
};
ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent e){
String action = e.getActionCommand();
if(word.length() == 1 && word.equals("0")){
word = "";
}
if(action.equals("1"))
word += "1";
else if(action.equals("2"))
word += "2";
else if(action.equals("3"))
word += "3";
else if(action.equals("4"))
word += "4";
else if(action.equals("5"))
word += "5";
else if(action.equals("6"))
word += "6";
else if(action.equals("7"))
word += "7";
else if(action.equals("8"))
word += "8";
else if(action.equals("9"))
word += "9";
else if(action.equals("0"))
word += "0";
else if(word.length() > 1 && action.equals("back")){
word = word.substring(0, word.length()-1);
}
else if((word.length() == 1 && action.equals("back")) || action.equals("ce") ||
(word.length() == 0 && action.equals("back")))
word = "0";
tf.setText(word);
}
};
}
好吧，我找到了另一种获取图像的解决方案。我仍然不确定如何在没有参考的情况下抓取图像。我最终创建了一个单独的类来抓取图像，加载它们并将它们拉入使用。这是图像类的代码：
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
public class ImageMake{
private String path;
private int[] pixels;
public BufferedImage img;
// You can make img static depending on how you use it.
public ImageMake(String path){
this.path = path;
load();
}
public void load(){
try{
img = ImageIO.read(ImageMake.class.getResource(path));
int w = img.getWidth();
int h = img.getHeight();
pixels = new int[w * h];
img.getRGB(w, h, 0, 0, pixels, 0, w);
}catch(IOException e){e.printStackTrace();}
}
}
在我继续之前，我想说ImageMake.class部分可以互换为getClass()，因此声明最终将成为：
img = ImageIO.read(getClass().getResource(path));
所以现在，在另一个课程中，你会做同样的事情：
// Your code...
ImageMake image = new ImageMake("/res/textures/smiley.png");
genericJFrame.setIconImage(image.img); // This is just a random JFrame
// More of your code...
所以现在我将讨论一些重要的事情，那些从未在java中处理图像的人（比如我自己）应该知道。
请记住，我在上面发布的ImageMake类中，有类似的代码：
img = ImageIO.read(ImageMake.class.getResource(path));
ImageMake.class部分引用了您的类在您正在使用的任何存储设备上的文件夹。
就我而言，ImageMake类位于以下目录中：C：\ Users \ Charlie \ Documents \ Overall
在同一个文件夹中，我创建了另一个名为＆＃34; res＆＃34;然后在那个名为＆＃34; textures＆＃34;然后添加一个名为＆＃34; smiley.png＆＃34;
的.png图像当您传入字符串＆＃39;路径＆＃39;对于图像，它开始在您的班级所在的文件夹中搜索。在我的情况下，我必须传入＆＃34; /res/textures/smiley.png"确保您使用正斜杠＆＃34; /＆＃34;否则您可能会收到编译时错误＆＃39;非法转义符号，或某些运行时错误。
所以到达我的图像的整个代码外目录最终是这样的：C：\ Users \ Charlie \ Documents \ Overall \ res \ textures \ smiley.png
以下是主类的半成品代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.BorderFactory.*;
import javax.swing.JApplet;
import java.util.ArrayList;
public class Calculator{
private static JFrame f;
private Font font;
private boolean x = false, y = false;
private double num, num1, num2, num3, ans;
private int c = 0;
private String word = "", save = "", keep = "";
private JTextField tf = new JTextField("0");
private static JPanel p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14;
//private static ImageMake img = new ImageMake("/res/textures/smiley.png");
public Calculator(){
f = new JFrame("Calculator");
try{
javax.swing.UIManager.setLookAndFeel(new
com.sun.java.swing.plaf.windows.WindowsLookAndFeel());
}catch(Exception e){}
ArrayList<String> titles = new ArrayList<String>();
ArrayList<JButton> buttons = new ArrayList<JButton>();
for(int i = 0; i < 10; i++){
titles.add("" + i);
}
titles.add("C");
titles.add(".");
titles.add("/");
titles.add("*");
titles.add("+");
titles.add("-");
titles.add("<");
titles.add("=");
for(int i = 0; i < titles.size(); i++){
buttons.add(new JButton(titles.get(i)));
buttons.get(i).addKeyListener(kl);
buttons.get(i).addActionListener(al);
buttons.get(i).setFocusable(false);
if(i > 11 && i < 16)
buttons.get(i).setPreferredSize(new Dimension(40, 40));
else if(i > 15)
buttons.get(i).setPreferredSize(new Dimension(85, 40));
else
buttons.get(i).setPreferredSize(new Dimension(50, 40));
}
font = new Font(Font.MONOSPACED, Font.PLAIN, 24);
tf.setPreferredSize(new Dimension(290, 60));
tf.setEditable(false);
tf.setHorizontalAlignment(JTextField.RIGHT);
tf.setFont(font);
TitledBorder t0, t1, t2, t3;
t0 = BorderFactory.createTitledBorder(" INPUT ");
t1 = BorderFactory.createTitledBorder(" OPERATIONS ");
p0 = new JPanel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
p6 = new JPanel();
p7 = new JPanel();
p8 = new JPanel();
p9 = new JPanel();
p10 = new JPanel();
p11 = new JPanel();
p12 = new JPanel();
p13 = new JPanel();
p14 = new JPanel();
p0.add(tf);
p14.add(p0);
p1.add(buttons.get(1)); p1.add(buttons.get(2)); p1.add(buttons.get(3));
p2.add(buttons.get(4)); p2.add(buttons.get(5)); p2.add(buttons.get(6));
p3.add(buttons.get(7)); p3.add(buttons.get(8)); p3.add(buttons.get(9));
p4.add(buttons.get(10)); p4.add(buttons.get(0)); p4.add(buttons.get(11));
p5.add(p1); p5.add(p2); p5.add(p3); p5.add(p4);
p5.setLayout(new BoxLayout(p5, BoxLayout.PAGE_AXIS));
p5.setBorder(t0);
p6.add(buttons.get(16));
p7.add(buttons.get(12)); p7.add(buttons.get(13));
p8.add(buttons.get(14)); p8.add(buttons.get(15));
p9.add(buttons.get(17));
p10.add(p6); p10.add(p7); p10.add(p8); p10.add(p9);
p10.setLayout(new BoxLayout(p10, BoxLayout.PAGE_AXIS));
p10.setBorder(t1);
p11.add(p5); p11.add(p10);
p12.add(p14); p12.add(p11);
p12.setLayout(new BoxLayout(p12, BoxLayout.PAGE_AXIS));
f.addKeyListener(kl);
f.add(p12);
}
public static void main(){
new Calculator();
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//f.setIconImage(img.img);
f.pack();
f.setLocationRelativeTo(null);
f.setFocusable(true);
f.setVisible(true);
}
public void operationType(String operation){
if(operation.equals("=")){
num2 = num3;
operation = keep;
}
switch(operation){
case "/": num = (num1 / num2); word = "" + num; break;
case "*": num = (num1 * num2); word = "" + num; break;
case "+": num = (num1 + num2); word = "" + num; break;
case "-": num = (num1 - num2); word = "" + num; break;
}
num1 = num;
}
KeyListener kl = new KeyAdapter(){
public void keyPressed(KeyEvent e){
int press = e.getKeyCode();
if(!word.equals("") && !word.equals("/") && !word.equals("*") && !word.equals("+") && !word.equals("-") && !word.equals(".")) ans = Double.parseDouble(word);
if((word.equals("0") && press != KeyEvent.VK_ENTER && press != KeyEvent.VK_EQUALS) ||
word.equals("/") ||
word.equals("*") ||
word.equals("+") ||
word.equals("-") || x){
word = "";
x = false;
}
if(e.getKeyChar() == '+'){
num1 = Double.parseDouble(word); word = save = keep = "+";
}
switch(press){
case KeyEvent.VK_1: word += "1"; break;
case KeyEvent.VK_2: word += "2"; break;
case KeyEvent.VK_3: word += "3"; break;
case KeyEvent.VK_4: word += "4"; break;
case KeyEvent.VK_5: word += "5"; break;
case KeyEvent.VK_6: word += "6"; break;
case KeyEvent.VK_7: word += "7"; break;
case KeyEvent.VK_8: word += "8"; break;
case KeyEvent.VK_9: word += "9"; break;
case KeyEvent.VK_0: word += "0"; break;
case KeyEvent.VK_PERIOD: word += "."; break;
case KeyEvent.VK_SLASH: num1 = ans; word = save = keep = "/"; break;
case KeyEvent.VK_X: num1 = ans; word = save = keep = "*"; break;
case KeyEvent.VK_MINUS: num1 = ans; word = save = keep = "-"; break;
case KeyEvent.VK_ENTER:
if(save.equals("=")){
num2 = ans; x = true; operationType(save);}
else{
num2 = ans; num3 = num2; save = "="; x = true; operationType(save);} break;
case KeyEvent.VK_BACK_SPACE:
if(word.length() > 1)
word = word.substring(0, word.length() - 1);
else if(word.length() == 1 || word.length() == 0)
word = "0"; break;
case KeyEvent.VK_ESCAPE: word = "0"; break;
case KeyEvent.VK_CONTROL: word = "0";
}
tf.setText(word);
}
};
ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent e){
String action = e.getActionCommand();
if(!word.equals("") && !word.equals("/") && !word.equals("*") && !word.equals("+") && !word.equals("-") && !word.equals(".")) ans = Double.parseDouble(word);
if((word.equals("0") && !action.equals("=")) ||
word.equals("/") ||
word.equals("*") ||
word.equals("+") ||
word.equals("-") || x){
word = "" ;
x = false;
}
switch(action){
case "1": word += "1"; break;
case "2": word += "2"; break;
case "3": word += "3"; break;
case "4": word += "4"; break;
case "5": word += "5"; break;
case "6": word += "6"; break;
case "7": word += "7"; break;
case "8": word += "8"; break;
case "9": word += "9"; break;
case "0": word += "0"; break;
case ".": word += "."; break;
case "/": num1 = ans; word = save = keep = "/"; break;
case "*": num1 = ans; word = save = keep = "*"; break;
case "+": num1 = ans; word = save = keep = "+"; break;
case "-": num1 = ans; word = save = keep = "-"; break;
case "=":
if(save.equals("=")){
num2 = ans; x = true; operationType(save);}
else{
num2 = ans; num3 = num2; save = "="; x = true; operationType(save);} break;
case "<":
if(word.length() > 1)
word = word.substring(0, word.length() - 1);
else if(word.length() == 1 || word.length() == 0)
word = "0"; break;
case "C": word = "0"; break;
}
tf.setText(word);
}
};
}
它仍然有一些需要修复的潜在错误。
答案 0 :(得分：0)
试试这个：
public static ImageIcon createIcon(String spec) {
URL url = ClassLoader.getSystemResource(spec);
if (url != null) {
return new ImageIcon(url);
}
try {
return new ImageIcon(new URL(spec));
} catch (MalformedURLException ex) {
return new ImageIcon(spec);
}
}