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main º¯Êý
C++
//×ÔÓɸ¡¶¯µÄº¯Êý
int main( int argc, char* argv[])
{
    printf( "Hello, world" );
}
Java
// ÿ¸öº¯Êý¶¼±ØÐëÊÇÒ»¸öÀàµÄÒ»²¿·Ö;µ±java <class>ÔËÐÐÊÇÒ»¸öÌض¨ÀàµÄÖ÷º¯Êý»á±»µ÷ÓÃ
// (Òò´ËÄã¿ÉÒÔÈÃÿ¸öÀ඼ÓÐÒ»¸ömainº¯Êý£¬ÕâÔÚдµ¥Ôª²âÊÔÊǺÜÓÐÓÃ)
class HelloWorld
{
    public static void main(String args[])
    {
        System.out.println( "Hello, World" );
    }
}
ÀàµÄÉùÃ÷
³ýÁË Java ²»ÒªÇóÓ÷ֺÅÍ⼸ºõÊÇÏàͬµÄ¡£
C++
    class Bar {};
   
Java
    class Bar {}
   
·½·¨ÉùÃ÷
   ¶¼ÏàͬµÄ, ³ýÁËÔÚJava,·½·¨±ØÐë×ÜÊÇij¸öÀàµÄÒ»²¿·Ö²¢ÇÒ¿ÉÄÜpublic/private/protected ×÷ΪÐÞÊÎ
¹¹Ô캯ÊýºÍÎö¹¹º¯Êý
¹¹Ô캯Êý¶¼ÊÇÏàͬµÄ (¼´ÀàµÄÃû×Ö), JavaûÓÐ׼ȷÒâÒåÉϵĵÄÎö¹¹º¯Êý
¾²Ì¬³ÉÔ±º¯ÊýºÍ±äÁ¿
·½·¨ÉùÃ÷ÊÇÏàͬµÄ, µ« Java Ìṩ¾²Ì¬³õʼ»¯¿éÀ´À´³õʼ»¯¾²Ì¬±äÁ¿ (²»ÐèÒªÔÚÔ´ÎļþÖÐÉùÃ÷):
class Foo
{
    static private int x;
    // ¾²Ì¬³õʼ»¯¿é
    { x = 5; }
}
¶ÔÏóµÄÉùÃ÷
C++
    // ÔÚÕ»ÖÐ
    myClass x;
 
    //»òÕßÔÚ¶ÑÖÐ
    myClass *x = new myClass;
   
Java
   // ×ÜÊÇÔÚ¶Ô¶ÑÖÐÉùÃ÷
    myClass x = new myClass();
   
¼Ì   ³Ð
C++
    class Foo : public Bar
    { ... };
   
Java
    class Foo extends Bar
    { ... }
   
·ÃÎʼ¶±ð (abstraction barriers)
C++
   public:
        void foo();
        void bar();
   
Java
    public void foo();
    public void bar();
   
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C++
  


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