有没有一种方法可以检测文本而不覆盖它？
Is there a way where I can detect text and not overwrite it?
我正在努力写这个
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.")
到我的 scores.txt 文件中。
这就是我希望 scores.txt 文件中的输出看起来像：
在这里写保存然后跳行
在这里写保存然后跳过行（一遍又一遍地重复）
我的问题
每次我按下保存分数按钮时，它都会运行这段代码
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.")
这很好。但是每当我再次按下保存分数按钮时，原始行就会被覆盖，这是我不希望发生的。
我试过的
我已经尝试了 \r\n 和 BufferedWriter，但它与我想要的结果不符。
我的代码
HackerGUI.java
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
public class HackerGUI extends JFrame
{
//jframe components
private JPanel rootPanel;
private JButton hack;
private JLabel time;
private JButton reset;
private JLabel description;
private JLabel title;
private JLabel gif;
private JTextField textField1;
private JButton saveScoresButton;
private JButton settingsButton;
private JButton placeholder;
//timer stuff
private final Timer timer; //create timer
private final long duration = 10000; //duration of time
private long startTime = -1; //start of the time
private int delay = 300; //delay of when the time starts
//hacker levels
private int count = 0;
public HackerGUI()
{
add(rootPanel); //add intellij windows builder form
setTitle("Hacker UI v8.4"); //set the title of the frame
try {
File myObj = new File("scores.txt");
if (myObj.createNewFile()) {
System.out.println("File created: " + myObj.getName());
System.out.println("Absolute path: " + myObj.getAbsolutePath());
} else {
System.out.println("Scores file already exists.");
}
} catch (IOException a) {
System.out.println("An error occurred.");
a.printStackTrace();
}
try {
File myObj = new File("settings.txt");
if (myObj.createNewFile()) {
System.out.println("File created: " + myObj.getName());
System.out.println("Absolute path: " + myObj.getAbsolutePath());
} else {
System.out.println("Settings file already exists.");
}
} catch (IOException a) {
System.out.println("An error occurred.");
a.printStackTrace();
}
timer = new Timer(20, new ActionListener() { //timer module
@Override
public void actionPerformed(ActionEvent e) {
if (startTime < 0) { //if time reaches 0, stop time so it doesn't go to negative int
startTime = System.currentTimeMillis(); //use system time
}
long now = System.currentTimeMillis(); //use system time
long clockTime = now - startTime;
if (clockTime >= duration) { //whenever clock reaches 0, run command under:
clockTime = duration;
timer.stop(); //stop the timer from going to the negatives
hack.setEnabled(false); //disables hack button as timer went to 0
reset.setEnabled(true); //enable reset button to play again
}
SimpleDateFormat df = new SimpleDateFormat("mm:ss.SSS"); //format of time shown
time.setText(df.format(duration - clockTime)); //set time component to destination
}
});
timer.setInitialDelay(delay); //set the delay
hack.addActionListener(new ActionListener() { //play action listener, triggers when button is pressed
@Override
public void actionPerformed(ActionEvent e) {
count++; //count in positives and add
hack.setText("Hacker Level: " + count); //change int and label
if (!timer.isRunning()) { //when button pressed, start timer
startTime = -1; //int to when start
timer.start(); //start
}
}
});
reset.addActionListener(new ActionListener() { //reset action listener, triggers when button is pressed
@Override
public void actionPerformed(ActionEvent e) {
hack.setEnabled(true); //enable hack button to start a new game
reset.setEnabled(false); //disable reset button as it has been used
//old command line save score
String name = textField1.getText(); //get name string
System.out.println(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds."); //print other info
System.out.println(""); //print spacer
//old command line save score
count = count + -count; //count in positive integers
hack.setText("Hacker Level: " + -count); //reset level score
time.setText("00:10.000"); //reset time label
}
});
saveScoresButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
FileWriter myWriter = new FileWriter("scores.txt");
String name = textField1.getText(); //get name string
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.");
myWriter.close();
System.out.println("Successfully wrote to the score file.");
} catch (IOException b) {
System.out.println("An error occurred.");
b.printStackTrace();
}
}
});
settingsButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO: put stuff here
}
});
//please don't delete! as this shows credits and help info
JOptionPane.showMessageDialog(rootPanel,
"Hacker UI v8.4 is created by _._#3324, thank you for downloading! What is Hacker UI v8.4? It is a clicker game! To know more, read the documentation! https://github.com/udu3324/Hacker-UI-v8.4");
System.out.println("Hacker UI v8.4: has successfully loaded.");
System.out.println("=====================================================");
System.out.println("");
}
private void createUIComponents() {
// TODO: place custom component creation code here
}
public void setData(HackerGUI data) {
}
public void getData(HackerGUI data) {
}
public boolean isModified(HackerGUI data) {
return false;
}
}
Main.java
import javax.swing.*;
import java.net.URL;
import java.util.Arrays;
public class Main {
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, javax.swing.UnsupportedLookAndFeelException
{
System.out.println("Hello, World!"); //Hello, World!
}
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
System.out.println("Hacker UI v8.4: is loading..."); //print status of loading
URL iconURL = getClass().getResource("/images/Hacker UI.png"); //load icon resource
ImageIcon icon = new ImageIcon(iconURL); //set icon to icon
HackerGUI hackergui = new HackerGUI(); //make a hacker gui
hackergui.setIconImage(icon.getImage()); //get icon resource and set as
hackergui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //terminate when asked on close
hackergui.setResizable(false); //no resizing
hackergui.pack(); //wrap it into a pack and set jframe size depending on jframe component size
hackergui.setLocationRelativeTo(null); //set location to middle of screen
hackergui.setVisible(true); //set the frame visible
}
});
}
}
如果你不想在每次需要追加的时候都覆盖文本。您可以按如下方式初始化 FileEriter 来完成此操作：
FileWriter myWriter = new FileWriter("scores.txt", true);
这个构造函数有两个参数，一个是你正在写入的文件，第二个是一个布尔表达式，它决定你是追加到文件还是覆盖它。
如果您想了解更多信息，可以在这里查看：
https://www.geeksforgeeks.org/java-program-to-append-a-string-in-an-existing-file/
我正在努力写这个
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.")
到我的 scores.txt 文件中。
这就是我希望 scores.txt 文件中的输出看起来像：
在这里写保存然后跳行
在这里写保存然后跳过行（一遍又一遍地重复）
我的问题
每次我按下保存分数按钮时，它都会运行这段代码
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.")
这很好。但是每当我再次按下保存分数按钮时，原始行就会被覆盖，这是我不希望发生的。
我试过的
我已经尝试了 \r\n 和 BufferedWriter，但它与我想要的结果不符。
我的代码
HackerGUI.java
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
public class HackerGUI extends JFrame
{
//jframe components
private JPanel rootPanel;
private JButton hack;
private JLabel time;
private JButton reset;
private JLabel description;
private JLabel title;
private JLabel gif;
private JTextField textField1;
private JButton saveScoresButton;
private JButton settingsButton;
private JButton placeholder;
//timer stuff
private final Timer timer; //create timer
private final long duration = 10000; //duration of time
private long startTime = -1; //start of the time
private int delay = 300; //delay of when the time starts
//hacker levels
private int count = 0;
public HackerGUI()
{
add(rootPanel); //add intellij windows builder form
setTitle("Hacker UI v8.4"); //set the title of the frame
try {
File myObj = new File("scores.txt");
if (myObj.createNewFile()) {
System.out.println("File created: " + myObj.getName());
System.out.println("Absolute path: " + myObj.getAbsolutePath());
} else {
System.out.println("Scores file already exists.");
}
} catch (IOException a) {
System.out.println("An error occurred.");
a.printStackTrace();
}
try {
File myObj = new File("settings.txt");
if (myObj.createNewFile()) {
System.out.println("File created: " + myObj.getName());
System.out.println("Absolute path: " + myObj.getAbsolutePath());
} else {
System.out.println("Settings file already exists.");
}
} catch (IOException a) {
System.out.println("An error occurred.");
a.printStackTrace();
}
timer = new Timer(20, new ActionListener() { //timer module
@Override
public void actionPerformed(ActionEvent e) {
if (startTime < 0) { //if time reaches 0, stop time so it doesn't go to negative int
startTime = System.currentTimeMillis(); //use system time
}
long now = System.currentTimeMillis(); //use system time
long clockTime = now - startTime;
if (clockTime >= duration) { //whenever clock reaches 0, run command under:
clockTime = duration;
timer.stop(); //stop the timer from going to the negatives
hack.setEnabled(false); //disables hack button as timer went to 0
reset.setEnabled(true); //enable reset button to play again
}
SimpleDateFormat df = new SimpleDateFormat("mm:ss.SSS"); //format of time shown
time.setText(df.format(duration - clockTime)); //set time component to destination
}
});
timer.setInitialDelay(delay); //set the delay
hack.addActionListener(new ActionListener() { //play action listener, triggers when button is pressed
@Override
public void actionPerformed(ActionEvent e) {
count++; //count in positives and add
hack.setText("Hacker Level: " + count); //change int and label
if (!timer.isRunning()) { //when button pressed, start timer
startTime = -1; //int to when start
timer.start(); //start
}
}
});
reset.addActionListener(new ActionListener() { //reset action listener, triggers when button is pressed
@Override
public void actionPerformed(ActionEvent e) {
hack.setEnabled(true); //enable hack button to start a new game
reset.setEnabled(false); //disable reset button as it has been used
//old command line save score
String name = textField1.getText(); //get name string
System.out.println(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds."); //print other info
System.out.println(""); //print spacer
//old command line save score
count = count + -count; //count in positive integers
hack.setText("Hacker Level: " + -count); //reset level score
time.setText("00:10.000"); //reset time label
}
});
saveScoresButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
FileWriter myWriter = new FileWriter("scores.txt");
String name = textField1.getText(); //get name string
myWriter.write(name + " has scored " + count + " hacker levels in " + duration +" milli-seconds with a delay of " + delay + " milli-seconds.");
myWriter.close();
System.out.println("Successfully wrote to the score file.");
} catch (IOException b) {
System.out.println("An error occurred.");
b.printStackTrace();
}
}
});
settingsButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO: put stuff here
}
});
//please don't delete! as this shows credits and help info
JOptionPane.showMessageDialog(rootPanel,
"Hacker UI v8.4 is created by _._#3324, thank you for downloading! What is Hacker UI v8.4? It is a clicker game! To know more, read the documentation! https://github.com/udu3324/Hacker-UI-v8.4");
System.out.println("Hacker UI v8.4: has successfully loaded.");
System.out.println("=====================================================");
System.out.println("");
}
private void createUIComponents() {
// TODO: place custom component creation code here
}
public void setData(HackerGUI data) {
}
public void getData(HackerGUI data) {
}
public boolean isModified(HackerGUI data) {
return false;
}
}
Main.java
import javax.swing.*;
import java.net.URL;
import java.util.Arrays;
public class Main {
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, javax.swing.UnsupportedLookAndFeelException
{
System.out.println("Hello, World!"); //Hello, World!
}
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
System.out.println("Hacker UI v8.4: is loading..."); //print status of loading
URL iconURL = getClass().getResource("/images/Hacker UI.png"); //load icon resource
ImageIcon icon = new ImageIcon(iconURL); //set icon to icon
HackerGUI hackergui = new HackerGUI(); //make a hacker gui
hackergui.setIconImage(icon.getImage()); //get icon resource and set as
hackergui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //terminate when asked on close
hackergui.setResizable(false); //no resizing
hackergui.pack(); //wrap it into a pack and set jframe size depending on jframe component size
hackergui.setLocationRelativeTo(null); //set location to middle of screen
hackergui.setVisible(true); //set the frame visible
}
});
}
}
如果你不想在每次需要追加的时候都覆盖文本。您可以按如下方式初始化 FileEriter 来完成此操作：
FileWriter myWriter = new FileWriter("scores.txt", true);
这个构造函数有两个参数，一个是你正在写入的文件，第二个是一个布尔表达式，它决定你是追加到文件还是覆盖它。
如果您想了解更多信息，可以在这里查看： https://www.geeksforgeeks.org/java-program-to-append-a-string-in-an-existing-file/