小编Dor*_*ris的帖子

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/schedule?useSSL=false&amp;autoReconnect=true </property>
        <property name="connection.username">root</property>
        <property name="connection.password">1234</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect"
>org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class"
>thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class"
>org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql"
>true</property>

     <property name="format_sql">true</property>

     <property name="hibernate.c3p0.acquire_increment">1</property>
    <property …

class Overflowtest {

  public static void main(String[] args) {

    byte maxValue= Byte.MAX_VALUE;
    System.out.println("maxValue of byte is "+maxValue);
    System.out.println("add 1 to maxValue of byte is "+maxValue+(byte)2);

  }
}

为什么我尝试时没有发生溢出maxValue+(byte)2？但如果我这样做(byte)(maxValue+2),溢出就发生了.