https://openjdk.java.net/ 
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package java.awt.dnd;

import java.lang.annotation.Native;


This class contains constant values representing
the type of action(s) to be performed by a Drag and Drop operation.

Since:1.2
/**
 * This class contains constant values representing
 * the type of action(s) to be performed by a Drag and Drop operation.
 * @since 1.2
 */
public final class DnDConstants {

    private DnDConstants() {} // define null private constructor.

    
An int representing no action. 
/**
     * An {@code int} representing no action.
     */
    @Native public static final int ACTION_NONE         = 0x0;

    
An int representing a "copy" action. 
/**
     * An {@code int} representing a "copy" action.
     */
    @Native public static final int ACTION_COPY         = 0x1;

    
An int representing a "move" action. 
/**
     * An {@code int} representing a "move" action.
     */
    @Native public static final int ACTION_MOVE         = 0x2;

    
An int representing a "copy" or "move" action. 
/**
     * An {@code int} representing a "copy" or
     * "move" action.
     */
    @Native public static final int ACTION_COPY_OR_MOVE = ACTION_COPY | ACTION_MOVE;

    
An int representing a "link" action. The link verb is found in many, if not all native DnD platforms, and the actual interpretation of LINK semantics is both platform and application dependent. Broadly speaking, the semantic is "do not copy, or move the operand, but create a reference to it". Defining the meaning of "reference" is where ambiguity is introduced. The verb is provided for completeness, but its use is not recommended for DnD operations between logically distinct applications where misinterpretation of the operations semantics could lead to confusing results for the user. 
/**
     * An {@code int} representing a "link" action.
     *
     * The link verb is found in many, if not all native DnD platforms, and the
     * actual interpretation of LINK semantics is both platform
     * and application dependent. Broadly speaking, the
     * semantic is "do not copy, or move the operand, but create a reference
     * to it". Defining the meaning of "reference" is where ambiguity is
     * introduced.
     *
     * The verb is provided for completeness, but its use is not recommended
     * for DnD operations between logically distinct applications where
     * misinterpretation of the operations semantics could lead to confusing
     * results for the user.
     */

    @Native public static final int ACTION_LINK         = 0x40000000;

    
An int representing a "reference" action (synonym for ACTION_LINK). 
/**
     * An {@code int} representing a "reference"
     * action (synonym for ACTION_LINK).
     */
    @Native public static final int ACTION_REFERENCE    = ACTION_LINK;

}