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;
}
}
// 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);
}
// 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;
}
}
