This article uses various approaches for selecting the commands inserted in the opened command window through the Java code. The command window is opened by using ‘cmd’. Here, the methods of doing the same are specified using Java code. The Command window is first opened using the Java program. It is opened as a child process. If the java program is run in an existing cmd window, another one is opened as a new process. Further, different types of commands are inserted and executed in that opened command window 通过Java代码。
这些程序可能在在线编程环境中无法运行。如何使用javac和java命令运行这些程序的详细信息在本文中的输出部分中详细说明。
步骤 1 − 使用 Java 代码打开 CMD 窗口。
Step 2 − Select the command to be executed. The selected command is used as a text String.
第三步 - 通过Java程序在打开的CMD窗口中执行所选命令。
第四步 − 查看结果。
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对于这些程序，命令的选择是通过两种不同的方法来完成的。
By Using Commands that change the property of the cmd window.
By Using Executable Commands
Let’s see the program along with its output one by one.
First, the java code is given to start the new CMD window.
函数是一组语句一起执行任务。在MATLAB中，函数定义在单独的文件。文件函数的文件名应该是相同的。 函数操作在自己的工作空间，它也被称为本地工作区，独立的工作区，在 MATLAB 命令提示符访问，这就是所谓的基础工作区的变量。函数可以接受多个输入参数和可能返回多个输出参数 。 MATLAB是MathWorks公司开发的一种编程语言。它最初是一个矩阵的编程语言，使线性代数编程很简单。它可以运行在交互式会话和作为批处理作业。有需要的朋友可以下载看看
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public class cmdprog1 {
public static void main(String[] args) {
System.out.println("Opening cmd window");
try{
// cmd is a command that opens the command window
//CMD /C is used to run commands and then terminate the existing window while CMD /K will run the command and then it returns you to the given prompt. Runtime.getRuntime().exec(new String[] {"cmd", "/K", "Start"});
// the following line can also be used.....
//Runtime.getRuntime().exec(new String[] {"cmd", "/C", "Start"});
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
C:\java\javaprgstu>javac cmdprog1.java C:\java\javaprgstu>java cmdprog1 Opening cmd window C:\java\javaprgstu>
在这种方法中，使用了两个不同的示例。
示例1：在打开CMD窗口时更改标题。
示例2：在打开CMD窗口时更改背景和前景颜色。
public class cmdprog22 {
public static void main(String[] args) {
String command_to_playwith =" title 'The New Title of the New Command Window' ";
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
//Starting the new child process
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println();
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
C:\java\javaprgstu>javac cmdprog22.java C:\java\javaprgstu>java cmdprog22 Opening cmd window The child process is Alive: true
public class cmdprog55 {
public static void main(String[] args) {
//the following command will change the color of the cmd window. First the number for bg color and then the number for fg color is added.
// 4 means red color and 0 means black color
String command_to_playwith =" COLOR 40";
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
// starting the child process ....
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println();
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
C:\java\javaprgstu>javac cmdprog55.java C:\java\javaprgstu>java cmdprog55 Opening cmd window The child process is Alive: true
新的cmd窗口作为子进程打开。插入的命令结果只能在新的cmd窗口中看到。在这种方法中，使用了三个不同的示例。
示例1：在打开的CMD窗口中显示消息。
Example 2 Show the contents of a txt file.
示例3：以宽格式显示文件夹内容。
public class cmdprog44 {
public static void main(String[] args) {
// The following command will display the message specified.
String command_to_playwith =" ECHO 'Hi! Lets check the cmd commands ....'";
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
// starting the child process....
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println();
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
// starting the child process ....
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println();
}
catch (Exception e){
System.out.println("Error: " + e);
}
C:\java\javaprgstu>javac cmdprog44.java C:\java\javaprgstu>java cmdprog44 Opening cmd window The child process is Alive: true
public class cmdprog33 {
public static void main(String[] args) {
//The following command is the command that is needed to see the contents of the given text file
String command_to_playwith =" TYPE testfile.txt";
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
//Starting the new child process
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println(" Now showing the content of testfile.txt ....\n");
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
C:\java\javaprgstu>javac cmdprog33.java C:\java\javaprgstu>java cmdprog33 Opening cmd window The child process is Alive: true Now showing the content of testfile.txt ...
public class cmdprog66 {
public static void main(String[] args) {
// The following command will display the specified directory in wide format
String command_to_playwith =" dir .\applettest /W";
System.out.println("Opening cmd window");
try {
String command = "cmd /c" + " start" + command_to_playwith;
//Starting the new child process
Process childprocess11 = Runtime.getRuntime().exec(command);
System.out.println("The child process is Alive: " + childprocess11.isAlive());
System.out.println(" Now showing the directory in wide format ....\n");
}
catch (Exception e){
System.out.println("Error: " + e);
}
}
}
C:\java\javaprgstu>javac cmdprog66.java C:\java\javaprgstu>java cmdprog66 Opening cmd window The child process is Alive: true Now showing the directory in wide format ...
In this article, we explored different commands to be inserted into the cmd window after opening it through the java program. The selection of commands is done based on the different categories. The first set of commands changes the properties of the command window while opening it and the second set of commands is used to show results in the opened command window after it is displayed. In both cases, the new cmd window is opened as a child process.
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