bin/roaster     (Unix/Linux/OSX)
bin/roaster.bat (Windows)

$ roaster -h

Usage: roaster [OPTION]... FILES ...
The fastest way to build applications, share your software, and enjoy doing it.

-c, --config [CONFIG_FILE]
	 specify the path to the Eclipse code format profile (usually found at '$PROJECT/.settings/org.eclipse.jdt.core.prefs')

-r, --recursive
	 format files in found sub-directories recursively

FILES...
	 specify one or more space-separated files or directories to format

-h, --help
	 display this help and exit

Roaster.parse(JavaClassSource.class, "public class HelloWorld {}");

final JavaClassSource javaClass = Roaster.create(JavaClassSource.class);
javaClass.setPackage("com.company.example").setName("Person");

javaClass.addInterface(Serializable.class);
javaClass.addField()
  .setName("serialVersionUID")
  .setType("long")
  .setLiteralInitializer("1L")
  .setPrivate()
  .setStatic(true)
  .setFinal(true);

javaClass.addProperty(Integer.class, "id").setMutable(false);
javaClass.addProperty(String.class, "firstName");
javaClass.addProperty("String", "lastName");

javaClass.addMethod()
  .setConstructor(true)
  .setPublic()
  .setBody("this.id = id;")
  .addParameter(Integer.class, "id");

package com.company.example;

import java.io.Serializable;

public class Person implements Serializable {

   private static final long serialVersionUID = 1L;
   private final Integer id;
   private String firstName;
   private String lastName;

   public Integer getId() {
      return id;
   }

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String lastName) {
      this.lastName = lastName;
   }

   public Person(Integer id) {
      this.id = id;
   }
}

JavaClassSource javaClass =
  Roaster.parse(JavaClassSource.class, "public class SomeClass {}");
javaClass.addMethod()
  .setPublic()
  .setStatic(true)
  .setName("main")
  .setReturnTypeVoid()
  .setBody("System.out.println(\"Hello World\");")
  .addParameter("java.lang.String[]", "args");
System.out.println(javaClass);

JavaClassSource javaClass =
  Roaster.parse(JavaClassSource.class, "public class SomeClass {}");
JavaDocSource javaDoc = javaClass.getJavaDoc();

javaDoc.setFullText("Full class documentation");
// or
javaDoc.setText("Class documentation text");
javaDoc.addTagValue("@author","George Gastaldi");

System.out.println(javaClass);

String javaCode = "public class MyClass{ private String field;}";
String formattedCode = Roaster.format(javaCode);
System.out.println(formattedCode);

String javaCode = "public class MyClass{ private String field;} public class AnotherClass {}";

JavaUnit unit = Roaster.parseUnit(javaCode);

JavaClassSource myClass = unit.getGoverningType();
JavaClassSource anotherClass = (JavaClassSource) unit.getTopLevelTypes().get(1);

List<Problem> problem = Roaster.validateSnippet("public class HelloWorld {}");
// problem.size() == 0

List<Problem> problem = Roaster.validateSnippet("public class MyClass {");
// problem.size() == 1 containing a new Problem("Syntax error, insert \"}\" to complete ClassBody", 21, 21, 1)