how to run/compile java code from JTextArea at Runtime? ----urgent!!! college project

Answer 1

Take a look at the Java 6 Compiler API

Answer 2

If you want to actually compile code from within java, it's doable but not trivial.

It's much better to use a scripting framework like Groovy--that would work great. Groovy is very java-compatible, it will almost always run java code directly (there are a few strange exceptions)

BeanShell is another scripting framework.

These both do just what you want without the effort of trying to figure out how to compile a class then load it into your existing runtime. (Actually, the problem I've seen isn't the initial compile, it's flushing your class so you can replace it with a new one after an edit).

Answer 3

what i have done till now:-

•       //JTextArea = CustomCodeImageText
        String Code=CustomCodeImageText.getText();
  
  
    Code=Code.replaceAll("\n","");
    Code=Code.replaceAll("\t","");
  
  
   File TempOpeartionFile=new File("CustomMethodClass.java");
  
  
     try{   
        FileWriter outFile = new FileWriter(TempOpeartionFile);
  
  
    PrintWriter out = new PrintWriter(outFile);
  
  
    out.println("import java.awt.*;"); 
    out.println("import javax.swing.*;");
    out.println("import javax.imageio.*;");
    out.println("import java.awt.image.*;");
    out.println("import java.awt.image.ColorModel;");
    out.println("class CustomMethodClass {");
    out.println(Code);
    out.println("}");
    out.close();
  }catch(IOException e){}
  
  
    String[] command =  new String[4];
    command[0] = "cmd";
  
  
    command[1] = "/C";
  
  
    command[2] = "javac ";
  
  
    command[3] = "CustomMethodClass.java";
  
  
    Process process = Runtime.getRuntime().exec(command);
  
  
    custom=new CustomMethodClass();
    BufferedImage manipulated=custom.customOperation(currentImage);
  
  
  

but,i m getting manipulated image only once i.e on clicking apply button first time.

but after doing some modifications in code inside JTextArea i m getting the same old manipulated Image rather than the newer one.