下面Java代码的运行结果是()。classPenguin{ privateStringname=null;//名字 privateinthealth=0;//健康值 privateStringsex=null;//性别 publicvoidPenguin(){ health=10;sex="雄"; System.out.println("执行构造方法。"); } publicvoidprint(){ System.out.println("企鹅的名字是"+name+",健康值是"+health+",性别是"+sex+"。"); } publicstaticvoidmain(String[]args){ Penguinpgn=newPenguin(); pgn.print(); } }