1.int和Integer、long和Long各种相等不相等 https://www.cnblogs.com/guodongdidi/p/6953217.html 2.String a="abc",b="ab"+"c",c=new String("ab")+"c"; ==吗 https://blog.csdn.net/qq_34490018/article/details/82110578 3.这三个方法的关系,同时执行 public void f1(){ synchronized (th...