JTextArea 作为控制台
我在下面发布了两段代码.两个代码单独工作正常.现在,当我运行文件 Easy 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"按钮后在第一堂课中创建的 JTextArea 中运行?我想也许是通过动作监听器?(我们在按钮的情况下做的方式)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.*;导入 javax.swing.*;导入 java.awt.event.*;公共类 Easy 扩展 JFrame{JTextArea 文本=新 JTextArea();JPanel 面板=新 JPanel(新 GridLayout(2,2));JButton button1 =new JButton("开始");公共容易(){panel.add(文本);panel.add(button1);添加(面板,BorderLayout.CENTER);button1.addActionListener(new ActionListener() {公共无效actionPerformed(ActionEvent ae){//添加代码以调用其他类并使 JTextArea 充当控制台}});}公共静态无效主要(字符串arg []){简易框架=新简易();frame.setSize(300,100);frame.setVisible(true);}}
第二课:
导入 java.util.Scanner;类 AddNumber{公共静态无效主(字符串参数 []){整数 x, y, z;System.out.println("输入两个要相加的数字");扫描仪输入 = 新扫描仪(System.in);x = in.nextInt();y = in.nextInt();z = x + y;System.out.println("输入数字的总和 = "+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两个要添加的数字"......但在哪里可以用户提供他的输入?
我只需要在我的班级的主要方法中引用控制台......它工作......好吧,不完全像我希望的那样......但部分......输入还是要从IDE的终端去..
解决方案如果你在 Google 上搜索:stdout JTextArea",你会找到几个链接来解决你的问题.
- http://www.coderanch.com/t/458147/GUI/java/Redirect-output-stderr-stdout-JTextArea
- 将 System.out 重定向到 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.我在下面附上了他的解决方案.
TextAreaOutputStream.java
<代码>/*** @(#) TextAreaOutputStream.java**/导入 java.io.IOException;导入 java.io.OutputStream;导入 javax.swing.JTextArea;/*** 将其输出写入 javax.swing.JTextArea 的输出流* 控制.** @作者兰加纳特·基尼* @see javax.swing.JTextArea*/公共类 TextAreaOutputStream 扩展 OutputStream {私有 JTextArea 文本控件;/*** 创建一个 TextAreaOutputStream 的新实例,它写入* 到 javax.swing.JTextArea 控件的指定实例.** @param control 对 javax.swing.JTextArea 的引用* 必须将输出重定向到的控件* 到.*/公共TextAreaOutputStream(JTextArea控件){文本控制 = 控制;}/*** 将指定字节作为字符写入* javax.swing.JTextArea.** @param b 要作为字符写入的字节* JTextArea.*/公共无效写入(int b)抛出 IOException {//将数据作为字符附加到 JTextArea 控件textControl.append(String.valueOf((char)b));}}
<块引用>
TextAreaOutputStream
扩展了 java.io.OutputStream
类并覆盖其 write(int)
方法重载,此类使用引用 javax.swing.JTextArea
控件实例,然后每当调用它的 write( int b ) 方法时,将输出附加到它.
要使用 TextAreaOutputStream
类,[yo]你应该使用:
用法
//创建 javax.swing.JTextArea 控件的实例JTextArea txtConsole = new JTextArea();//现在创建一个新的 TextAreaOutputStream 来写入我们的 JTextArea 控件并包装一个//围绕它的 PrintStream 以支持 println/printf 方法.PrintStream out = new PrintStream(new TextAreaOutputStream(txtConsole));//将标准输出流重定向到 TextAreaOutputStreamSystem.setOut(out);//将标准错误流重定向到 TextAreaOutputStreamSystem.setErr(out);//现在测试机制System.out.println("Hello World");
I have posted two pieces of code below. Both codes work fine individually. Now, when I run the file Easy, and click on the "Start" button, I want the class AddNumber to be implemented. I mean to say that, instead of the AddNumber running on the console, is there any way I could make AddNumber run in the JTextArea i have created in the first class upon clicking the "Start" button? I thought maybe by action listener?(the way we do in case of buttons) But I'm not sure. Is there any other way to make my JTextArea act as a console for the other .java files?
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);
}
}
The second class:
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);
}
}
I have seen a few posts talking about PrintStream..but i don't think that applies here. Please help me out. Thanks :)
UPDATE: well i found this link: http://www.codeproject.com/Articles/328417/Java-Console-apps-made-easy#HowtousethisJavaConsole1 and it works in the sense that it shows "Enter two numbers to be added "...but where can the user provide his input?
EDIT: I just had to make a reference of the console in the main method of my class...and it works... well, not exactly as i would've wished to..but partly..the input still has to go from the terminal of the IDE..
解决方案If you do a Google search for: "stdout JTextArea", you will a couple of links to solve your problem.
- 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
In the last link, buddybob extends java.io.OutputStream
to print standard output to his JTextArea. I included his solution below.
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:
Usage
// 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" );
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