java - How to use enum with grouping and subgrouping hierarchy/nesting

Java - How to use enum with grouping and subgrouping hierarchy/nesting

In Java, you can use enums with grouping and subgrouping hierarchy by nesting enum classes within each other. Here's an example to demonstrate how to achieve this:

public enum Group { GROUP1( SubGroup1.VALUE1, SubGroup1.VALUE2 ), GROUP2( SubGroup2.VALUE3, SubGroup2.VALUE4 ); private final SubGroup[] subGroups; Group(SubGroup... subGroups) { this.subGroups = subGroups; } public SubGroup[] getSubGroups() { return subGroups; } public enum SubGroup { VALUE1, VALUE2 } public enum SubGroup2 { VALUE3, VALUE4 } }

In this example:

  • Group is the top-level enum representing groups.
  • Each group can contain one or more subgroups.
  • Each subgroup is an enum nested within its corresponding group.
  • Each subgroup can contain individual values.

You can access the enums in the hierarchy as follows:

// Access group values Group group1 = Group.GROUP1; Group group2 = Group.GROUP2; // Access subgroup values Group.SubGroup[] subGroups1 = group1.getSubGroups(); Group.SubGroup2[] subGroups2 = group2.getSubGroups();

This allows you to organize your enums into a hierarchical structure with grouping and subgrouping. Adjust the enum names and values according to your specific requirements.

Examples

  1. "Java enum grouping and subgrouping example"

    • Description: This query seeks examples demonstrating how to structure enums with hierarchical grouping and subgrouping in Java, aiding developers in organizing complex data models efficiently.
    • Code:
      public enum Group { SUBGROUP_ONE(EnumSet.of(Subgroup.A, Subgroup.B)), SUBGROUP_TWO(EnumSet.of(Subgroup.C, Subgroup.D)); private final EnumSet<Subgroup> subgroups; Group(EnumSet<Subgroup> subgroups) { this.subgroups = subgroups; } public EnumSet<Subgroup> getSubgroups() { return subgroups; } } public enum Subgroup { A, B, C, D; }

  2. "Java enum hierarchy with nesting example"

    • Description: This query aims to find Java code snippets illustrating the implementation of enums with nested hierarchies, showcasing how to represent complex relationships between enum constants.
    • Code:
      public enum Hierarchy { PARENT( EnumSet.of( new Node("Child1", EnumSet.of(new Node("SubChild1"), new Node("SubChild2"))), new Node("Child2", EnumSet.of(new Node("SubChild3"), new Node("SubChild4"))) ) ); private final Set<Node> nodes; Hierarchy(Set<Node> nodes) { this.nodes = nodes; } public Set<Node> getNodes() { return nodes; } } class Node { private final String name; private final Set<Node> children; Node(String name, Set<Node> children) { this.name = name; this.children = children; } // Getters and setters }

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