Does Java support structs

Question

Does Java have an analog of a C   struct   struct Member     string FirstName     string LastName      int BirthYear        I need to use my own data type

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Along with Java 14  it starts supporting Record  You may want to check that https   docs oracle com en java javase 14 docs api java base java lang Record html public record Person  String name  String address      Person person   new Person  quot Esteban quot    quot Stormhaven  Tamriel quot     And there are Sealed Classes after Java 15  https   openjdk java net jeps 360 sealed interface Shape permits Circle  Rectangle      record Circle Point center  int radius  implements Shape        record Rectangle Point lowerLeft  Point upperRight  implements Shape

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Actually a struct in C   is a class  e g  you can define methods there  it can be extended  it works exactly like a class   the only difference is that the default access modfiers are set to public  for classes they are set to private by default    This is really the only difference in C    many people don t know that

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The equivalent in Java to a struct would be  class Member       public String FirstName       public String LastName        public int    BirthYear         and there s nothing wrong with that in the right circumstances  Much the same as in C   really in terms of when do you use struct verses when do you use a class with encapsulated data

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Java doesn t have an analog to C   s structs  but you can use classes with all public members

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Yes  Java doesn t have struct value type yet  But  in the upcoming version of Java  we are going to get inline class which is similar to struct in C  and will help us write allocation free code    inline class point      int x    int y

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With Project JUnion you can use structs in Java by annotating a class with  Struct annotation   Struct class Member     string FirstName     string LastName      int BirthYear       More info at the project s website  https   tehleo github io junion

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Java 14 has added support for Records  which are structured data types that are very easy to build  You can declare a Java record like this  public record AuditInfo      LocalDateTime createdOn      String createdBy      LocalDateTime updatedOn      String updatedBy        public record PostInfo      Long id      String title      AuditInfo auditInfo       And  the Java compiler will generate the following Java class associated to the AuditInfo Record  public final class PostInfo         extends java lang Record       private final java lang Long id      private final java lang String title      private final AuditInfo auditInfo        public PostInfo              java lang Long id              java lang String title              AuditInfo auditInfo               compiled code                public java lang String toString        compiled code            public final int hashCode        compiled code            public final boolean equals java lang Object o       compiled code            public java lang Long id        compiled code            public java lang String title        compiled code            public AuditInfo auditInfo        compiled code          public final class AuditInfo         extends java lang Record       private final java time LocalDateTime createdOn      private final java lang String createdBy      private final java time LocalDateTime updatedOn      private final java lang String updatedBy        public AuditInfo              java time LocalDateTime createdOn              java lang String createdBy              java time LocalDateTime updatedOn              java lang String updatedBy               compiled code                public java lang String toString        compiled code            public final int hashCode        compiled code            public final boolean equals java lang Object o       compiled code            public java time LocalDateTime createdOn        compiled code            public java lang String createdBy        compiled code            public java time LocalDateTime updatedOn        compiled code            public java lang String updatedBy        compiled code         Notice that the constructor  accessor methods  as well as equals  hashCode  and toString are created for you  so it s very convenient to use Java Records  A Java Record can be created like any other Java object  PostInfo postInfo   new PostInfo      1L       quot High-Performance Java Persistence quot       new AuditInfo          LocalDateTime of 2016  11  2  12  0  0            quot Vlad Mihalcea quot           LocalDateTime now             quot Vlad Mihalcea quot

User · Answer

Structs  really  pure aren t supported in Java  E g   C  supports struct definitions that represent values and can be allocated anytime   In Java  the unique way to get an approximation of C   structs  struct Token       TokenType type      Stringp stringValue      double mathValue        Instantiation        Token t   new Token      without using a  static buffer or list  is doing something like  var type      TokenType      var stringValue      String      var mathValue      double        So  simply allocate variables or statically define them into a class

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Yes  a class is what you need  An class defines an own type

User · Answer

Java definitively has no structs    But what you describe here looks like a JavaBean kind of class

[java] Does Java support structs?

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