How to convert Integer to int

Question

I am working on a web application in which data will be transfer between client  amp  server side    I already know that JavaScript int    Java int  Because  Java int cannot be null  right   Now this is the problem I am facing   I changed my Java int variables into Integer    public void aouEmployee Employee employee  throws SQLException  ClassNotFoundException      Integer tempID   employee getId       String tname   employee getName       Integer tage   employee getAge       String tdept   employee getDept       PreparedStatement pstmt     Class forName  com mysql jdbc Driver       String url   jdbc mysql   localhost 3306 general      java sql Connection con   DriverManager getConnection url  root    1234       System out println  URL      url      System out println  Connection      con      pstmt    PreparedStatement  con prepareStatement  REPLACE INTO PERSON SET ID    NAME    AGE    DEPT         pstmt setInt 1  tempID      pstmt setString 2  tname      pstmt setInt 3  tage      pstmt setString 4  tdept      pstmt executeUpdate         My problem is here   pstmt setInt 1  tempID    pstmt setInt 3  tage     I cant use the Integer variables here  I tried with intgerObject intValue    But it makes things more complex  Do we have any other conversion methods or conversion techniques   Any fix would be better

User · Answer

Java converts Integer to int and back automatically  unless you are still with Java 1 4

User · Answer

Perhaps you have the compiler settings for your IDE set to Java 1 4 mode even if you are using a Java 5 JDK  Otherwise I agree with the other people who already mentioned autoboxing unboxing

User · Answer

Another simple way would be   Integer i   new Integer  10     if  i    null      int ip   Integer parseInt i toString

User · Answer

Since you say you re using Java 5  you can use setInt with an Integer due to autounboxing  pstmt setInt 1  tempID  should work just fine  In earlier versions of Java  you would have had to call  intValue   yourself   The opposite works as well    assigning an int to an Integer will automatically cause the int to be autoboxed using Integer valueOf int

User · Answer

As already written elsewhere      For Java 1 5 and later you don t need to do  almost  anything  it s done by the compiler    For Java 1 4 and before  use Integer intValue   to convert from Integer to int      BUT as you wrote  an Integer can be null  so it s wise to check that before trying to convert to int  or risk getting a NullPointerException      pstmt setInt 1   tempID    null   tempID   0        Java 1 5 or later   or    pstmt setInt 1   tempID    null   tempID intValue     0        any version  no autoboxing       using a default of zero  could also do nothing  show a warning or      I mostly prefer not using autoboxing  second sample line  so it s clear what I want to do

[java] How to convert Integer to int?

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