我想运行之前编译的代码.我编译无论如何编译并不重要,但运行代码是问题.
我的code.java
public class code{
public static void main(String[] args) {
System.out.println("Hello,World");
}
}
然后我编译了这段代码并生成了code.class(在D：//目录中).现在我想运行这个编译文件.我的代码是：
import java.io.IOException;
import java.io.InputStream;
public class compiler {
public static void main(String[] args) {
final String dosCommand = "cmd /c java code";
final String location = "D:\\";
try {
final Process process = Runtime.getRuntime().exec(
dosCommand + " " + location);
final InputStream in = process.getInputStream();
int ch;
while((ch = in.read()) != -1) {
System.out.print((char)ch);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
解决方法
当前你的cmd命令是错误的.
cmd /c java code D:/ /*this is not correct cmd command*/
它应该是
cmd /c java -cp D:/ code
当您在另一个文件夹中运行.class文件但不在当前文件夹中时,请使用-cp指定类路径
实际上没有错误nope.但是你没有捕获它们.捕获错误你可以使用getErrorStream()
示例代码
public class compiler {
public static void main(String[] args) {
final String dosCommand = "cmd /c java -cp ";
final String classname = "code";
final String location = "D:\\";
try {
final Process process = Runtime.getRuntime().exec(dosCommand + location + " " + classname);
final InputStream in = process.getInputStream();
final InputStream in2 = process.getErrorStream();
int ch,ch2;
while ((ch = in.read()) != -1) {
System.out.print((char) ch);
}
while ((ch2 = in2.read()) != -1) {
System.out.print((char) ch2); // read error here
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
