Java发生之前和线程安全

假设我有一个包装HashMap的类,如下所示:

public final class MyClass{

     private final Map map;

     //Called by Thread1
     public MyClass( int size ){
         this.map = new HashMap( size );
     }

     //Only ever called by Thread2
     public final String put( String key, String val ){
        return map.put( key, value );
     }

     //Only ever called by Thread2
     public final String get( String key ){
        return map.get( key );
     }

     //Only ever called by Thread2
     public final void printMap(  ){
       //Format and print the contents of the map
     }

}

该类通过"Thread1"初始化.但是,put,get,printMap和其他操作只能由"Thread2"调用.

我是否正确理解这个类是线程安全的:

由于对map的引用被声明为final,所有其他线程都会看到map的初始状态(之前发生).

由于put/get/printMap/etc仅由Thread2调用,因此不需要互斥.

谢谢