Java 在运行时在jtextArea中添加随机单词,而不使用键盘
正如标题所说,我想在运行时在jtextArea中添加单词,我只写了以下内容:Java 在运行时在jtextArea中添加随机单词,而不使用键盘,java,random,jtextarea,Java,Random,Jtextarea,正如标题所说,我想在运行时在jtextArea中添加单词,我只写了以下内容: import java.awt.*; import javax.swing.*; public class Test extends JFrame { private static final long serialVersionUID = 1L; private JTextArea tarea; public Test() { tarea = new JTextArea(
import java.awt.*;
import javax.swing.*;
public class Test extends JFrame {
private static final long serialVersionUID = 1L;
private JTextArea tarea;
public Test() {
tarea = new JTextArea(10, 10);
}
private void init() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
insertRandomLetterInsideJtextArea();
JScrollPane scroll = new JScrollPane(tarea);
getContentPane().add(scroll, BorderLayout.CENTER);
pack();
setLocationByPlatform(true);
setVisible(true);
}
private void insertRandomLetterInsideJtextArea() {
while (true) {
tarea.setText("foo\n");
}
}
public static void main(String... args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Test().init();
}
});
}
}
但它不起作用。while(true)
不允许显示任何内容。
有人可以解释一下原因吗?它不允许显示任何内容,因为应该初始化所有内容的线程只是在while循环中永远循环,所以它不能进行任何进一步的初始化 您需要在
insertRandomLetterInsideJtextArea
中启动一个线程,如下所示:
private void insertRandomLetterInsideJtextArea() {
new Thread() {
Random r = new Random();
public void run() {
while (true) {
try {
sleep(1000); // to not kill your app wait a little bit before adding next letter.
char c = (char) (r.nextInt(26) + 'a');
tarea.setText(tarea.getText() + c);
} catch (Exception e) {}
}
}
}.start();
}
它不允许显示任何内容,因为应该初始化everthing的线程只是在while循环中永远循环,所以它不能进行任何进一步的初始化 您需要在
insertRandomLetterInsideJtextArea
中启动一个线程,如下所示:
private void insertRandomLetterInsideJtextArea() {
new Thread() {
Random r = new Random();
public void run() {
while (true) {
try {
sleep(1000); // to not kill your app wait a little bit before adding next letter.
char c = (char) (r.nextInt(26) + 'a');
tarea.setText(tarea.getText() + c);
} catch (Exception e) {}
}
}
}.start();
}
你应该使用定时器来实现这一点。 试试这个:
package test;
import java.awt.BorderLayout;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class Test extends JFrame {
private static final long serialVersionUID = 1L;
private JTextArea tarea;
public Test() {
tarea = new JTextArea(10, 10);
}
private void init() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scroll = new JScrollPane(tarea);
getContentPane().add(scroll, BorderLayout.CENTER);
pack();
setLocationByPlatform(true);
setVisible(true);
insertRandomLetterInsideJtextArea();
}
private void insertRandomLetterInsideJtextArea() {
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
String content = "";
@Override
public void run() {
content += "foo\n"; // here generate your random String
tarea.setText(content);
}
}, 100, 1000); // firt is time before start, second is duration before repeat task, both in ms
}
public static void main(String... args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Test().init();
}
});
}
}
你应该使用定时器来实现这一点。 试试这个:
package test;
import java.awt.BorderLayout;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class Test extends JFrame {
private static final long serialVersionUID = 1L;
private JTextArea tarea;
public Test() {
tarea = new JTextArea(10, 10);
}
private void init() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scroll = new JScrollPane(tarea);
getContentPane().add(scroll, BorderLayout.CENTER);
pack();
setLocationByPlatform(true);
setVisible(true);
insertRandomLetterInsideJtextArea();
}
private void insertRandomLetterInsideJtextArea() {
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
String content = "";
@Override
public void run() {
content += "foo\n"; // here generate your random String
tarea.setText(content);
}
}, 100, 1000); // firt is time before start, second is duration before repeat task, both in ms
}
public static void main(String... args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Test().init();
}
});
}
}