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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.initializedfields.qual;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.InheritedAnnotation;
import org.checkerframework.framework.qual.PostconditionAnnotation;
import org.checkerframework.framework.qual.QualifierArgument;

/**
 * A method postcondition annotation indicates which fields the method definitely initializes.
 *
 * @checker_framework.manual #initialized-fields-checker Initialized Fields Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@PostconditionAnnotation(qualifier = InitializedFields.class)
@InheritedAnnotation
@Repeatable(EnsuresInitializedFields.List.class)
public @interface EnsuresInitializedFields {
  /**
   * The object whose fields this method initializes.
   *
   * @return object whose fields are initialized
   */
  public String[] value() default {"this"};

  /**
   * Fields that this method initializes.
   *
   * @return fields that this method initializes
   */
  @QualifierArgument("value")
  public String[] fields();

  /**
   * A wrapper annotation that makes the {@link EnsuresInitializedFields} annotation repeatable.
   *
   * Programmers generally do not need to write this. It is created by Java when a programmer
   * writes more than one {@link EnsuresInitializedFields} annotation at the same location.
   */
  @Documented
  @Retention(RetentionPolicy.RUNTIME)
  @Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
  @PostconditionAnnotation(qualifier = InitializedFields.class)
  @InheritedAnnotation
  public static @interface List {
    /**
     * Return the repeatable annotations.
     *
     * @return the repeatable annotations
     */
    EnsuresInitializedFields[] value();
  }
}