public Class<?> findClass(String s) {
   try {
     byte[] bytes = loadClassData(s);
     return defineClass(s, bytes, 0, bytes.length);
   } catch (IOException ioe) {
     try {
       return super.loadClass(s);
     } catch (ClassNotFoundException ignore) {
     }
     ioe.printStackTrace(System.out);
     return null;
   }
 }
示例#2
0
    // Writes the program to a source file, compiles it, and runs it.
    private void compileAndRun(String fileName, String code) {
      // Exceptions here can pick and choose what font to use, as needed.
      // Exceptions thrown by the program, that cause the Playground to be unstable, should be in
      // blue.

      println("Deleting old temp files...", progErr);
      new File(fileName + ".java").delete();
      new File(fileName + ".class").delete();

      println("Creating source file...", progErr);
      file = new File(fileName + ".java");

      println("Writing code to source file...", progErr);
      try {
        new FileWriter(file).append(code).close();
      } catch (IOException i) {
        println("Had an IO Exception when trying to write the code. Stack trace:", error);
        i.printStackTrace();
        return; // Exit on error
      }

      println("Compiling code...", progErr);
      // This should only ever be called if the JDK isn't installed. How you'd get here, I don't
      // know.
      if (compiler == null) {
        println("Fatal Error: JDK not installed. Go to java.sun.com and install.", error);
        return;
      }

      // Tries to compile. Success code is 0, so if something goes wrong, do stuff.
      int result =
          compiler.run(
              null,
              null,
              null,
              file
                  .getAbsolutePath()); // Possibly add a new outputstream to parse through the
                                       // compiler errors
      if (result != 0) {
        displayLog();
        println("Failed to compile.", error);
        return; // Return on error
      }

      println("Code compiled with 0 errors.", progErr);

      println("Attempting to run code...", progErr);
      run(fileName);
    }
示例#3
0
    // Creates a new thread, runs the program in that thread, and reports any errors as needed.
    private void run(String clazz) {
      try {
        // Makes sure the JVM resets if it's already running.
        if (JVMrunning) kill();

        // Some String constants for java path and OS-specific separators.
        String separator = System.getProperty("file.separator");
        String path = System.getProperty("java.home") + separator + "bin" + separator + "java";

        // Tries to run compiled code.
        ProcessBuilder builder = new ProcessBuilder(path, clazz);

        // Should be good now! Everything past this is on you. Don't mess it up.
        println(
            "Build succeeded on " + java.util.Calendar.getInstance().getTime().toString(), progErr);
        println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~", progErr);

        JVM = builder.start();

        // Note that as of right now, there is no support for input. Only output.
        Reader errorReader = new InputStreamReader(JVM.getErrorStream());
        Reader outReader = new InputStreamReader(JVM.getInputStream());
        // Writer inReader = new OutputStreamWriter(JVM.getOutputStream());

        redirectErr = redirectIOStream(errorReader, err);
        redirectOut = redirectIOStream(outReader, out);
        // redirectIn = redirectIOStream(null, inReader);

      } catch (IOException e) {
        // JVM = builder.start() can throw this.
        println("IOException when running the JVM.", progErr);
        e.printStackTrace();
        displayLog();
        return;
      }
    }