我在下面发布了两段代码。两个代码单独工作都很好。现在,当我运行 Easy 文件并单击“开始”按钮时,我希望实现 AddNumber 类。我的意思是说,除了在控制台上运行 AddNumber 之外,有什么方法可以让 AddNumber 在单击“开始”按钮后在我在第一个类中创建的 JTextArea 中运行吗?我想也许是通过 Action 监听器?(就像我们在按钮的情况下所做的那样)但我不确定。有没有其他方法可以让我的 JTextArea 充当其他 .java 文件的控制台?
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Easy extends JFrame{
JTextArea text=new JTextArea();
JPanel panel=new JPanel(new GridLayout(2,2));
JButton button1 =new JButton("Start");
public Easy(){
panel.add(text);
panel.add(button1);
add(panel,BorderLayout.CENTER);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
//add code to call the other class and make the JTextArea act as a console
}
});
}
public static void main(String arg[]){
Easy frame=new Easy();
frame.setSize(300,100);
frame.setVisible(true);
}
}
第二课:
import java.util.Scanner;
class AddNumber
{
public static void main(String args[])
{
int x, y, z;
System.out.println("Enter two numbers to be added ");
Scanner in = new Scanner(System.in);
x = in.nextInt();
y = in.nextInt();
z = x + y;
System.out.println("Sum of entered numbers = "+z);
}
}
我看过一些关于 PrintStream 的帖子..但我认为这不适用于这里。 请帮帮我。谢谢:)
更新:我找到了这个链接:http://www.codeproject.com/Articles/328417/Java-Console-apps-made-easy#HowtousethisJavaConsole1它的工作原理是它显示“输入要添加的两个数字”...但是用户可以在哪里提供他的输入?
编辑:我只需要在类的 main 方法中引用控制台...并且它可以工作...好吧,并不完全如我所愿...但部分...输入仍然必须来自 IDE 的终端..
最佳答案
如果您在 Google 上搜索:“stdout JTextArea”,您将看到几个链接来解决您的问题。
- http://www.coderanch.com/t/458147/GUI/java/Redirect-output-stderr-stdout-JTextArea
- Redirecting System.out to JTextPane
- http://www.jcreator.com/forums/index.php?showtopic=773
在最后一个链接中,buddybob 扩展了 java.io.OutputStream
以将标准输出打印到他的 JTextArea。我在下面列出了他的解决方案。
TextAreaOutputStream.java
/*
*
* @(#) TextAreaOutputStream.java
*
*/
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.JTextArea;
/**
* An output stream that writes its output to a javax.swing.JTextArea
* control.
*
* @author Ranganath Kini
* @see javax.swing.JTextArea
*/
public class TextAreaOutputStream extends OutputStream {
private JTextArea textControl;
/**
* Creates a new instance of TextAreaOutputStream which writes
* to the specified instance of javax.swing.JTextArea control.
*
* @param control A reference to the javax.swing.JTextArea
* control to which the output must be redirected
* to.
*/
public TextAreaOutputStream( JTextArea control ) {
textControl = control;
}
/**
* Writes the specified byte as a character to the
* javax.swing.JTextArea.
*
* @param b The byte to be written as character to the
* JTextArea.
*/
public void write( int b ) throws IOException {
// append the data as characters to the JTextArea control
textControl.append( String.valueOf( ( char )b ) );
}
}
The
TextAreaOutputStream
extends thejava.io.OutputStream
class and overrides itswrite(int)
method overload, this class uses a reference to ajavax.swing.JTextArea
control instance and then appends output to it whenever its write( int b ) method is called.To use the
TextAreaOutputStream
class, [yo]u should use:
用法
// Create an instance of javax.swing.JTextArea control
JTextArea txtConsole = new JTextArea();
// Now create a new TextAreaOutputStream to write to our JTextArea control and wrap a
// PrintStream around it to support the println/printf methods.
PrintStream out = new PrintStream( new TextAreaOutputStream( txtConsole ) );
// redirect standard output stream to the TextAreaOutputStream
System.setOut( out );
// redirect standard error stream to the TextAreaOutputStream
System.setErr( out );
// now test the mechanism
System.out.println( "Hello World" );
关于java - JTextArea 作为控制台,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48638502/