java 传值

好文章：https://zwmf.iteye.com/blog/1738574

public   class   Test
{   public int   i,j;
    public   void   test_m(Test   a)
    {     Test   b   =  new   Test();
          b.i   =   1;
          b.j   =   2;
          a   =   b;
    }
    public   void   test_m1(Test   a   )
    {     a.i   =   1;
        a.j   =   2;
    }
    public   static   void   main(String   argv[])
    {     Test   t=   new   Test();
          t.i   =   5;
          t.j   =   6;
          System.out.println( "t.i   =   "+   t.i   +   "   t.j=   "   +   t.j); //5,6
          t.test_m(t);
          System.out.println( "t.i   =   "+   t.i   +   "   t.j=   "   +   t.j); //5,6,a和t都指向了一个对象，而在test_m中s又指向了另一个对象，所以对象t不变！！！  

          t.test_m1(t);  

          System.out.println( "t.i   =   "+   t.i   +   "   t.j=   "   +   t.j); //1,2
    }
}

　　

其它：https://www.cnblogs.com/dolphin0520/p/3592498.html

https://www.cnblogs.com/chen-kh/p/6696303.html