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1.*ÒÔÏ´úÂëÔËÐеĽá¹ûÊÇʲô£¿
class Number{
 int i;
}
public class Assignment{
 public static void main(String[] args) {
  Number n1 = new Number();
  Number n2 = new Number();
  n1.i = 9;
  n2.i = 47;
  System.out.println ("n1.i="+n1.i+",n2.i="+n2.i);
  n1 = n2;
  n1.i = 50;
  System.out.println ("n1.i="+n1.i+",n2.i="+n2.i);  
 }
}
2.ÏÈ¿´ÏÂÁдúÂ룺
Integer n1 = new Integer(20);
Integer n2 = new Integer(20);
ÇëÎÊÈç¹ûÔËÐÐÕâÐдúÂ룺System.out.println(n1==n2);´òÓ¡³öÀ´µÄ½á¹ûÊÇtrue»¹ÊÇfalse?Ϊʲô£¿
3.ÇëÎÊÒÔϳÌÐòÔËÐеĽá¹ûÊÇʲô£¿
public class Display{
 public static void main(String[] args) {
  int x = 2, y = 3, z = 4;
  String str = "x,y,z";
  System.out.println (str + x + y + z);
  System.out.println (x + y + z + str);
 }
}
4.Çë¿´ÏÂÃæÒ»¶Î¹ØÓÚ¹¹Ô캯ÊýµÄ³ÌÐò£º
class Rock{
 public Rock() {
  System.out.println ("Creating Rock");
 }
}
public class SimpleConstructor{
 public static void main(String[] args) {
  for(int i=0; i<10; i++) {
   new Rock();
  }
 }
}
ÇëÎʽá¹ûÊÇʲô£¿
5.ÇëÎÊÏÂÁгÌÐòµÄÔËÐнá¹ûÊÇʲô£¿
class Letter{
 char c;
}
public class Pass {
 static void f(Letter y) {
  y.c = 'z';
 }
 public static void main(String[] args) {
  Letter x = new Letter();
  x.c = 'a';
  System.out.println ("֮ǰx.c:"+x.c);
  f(x);
  System.out.println ("Ö®ºóx.c:" + x.c);
 }
}
6.*ÇëÎÊÒÔÏ´úÂëµÄÔËÐнá¹ûÊÇʲô£¿
   ½«new Rock(i)Ìæ»»³Énew Rock( )£¬´Ëʱ³ÌÐò±àÒëÄܹ»Í¨¹ýÂð£¿ÎªÊ²Ã´£¿
   ÈçºÎÐÞ¸ÄÄܹ»ÈñàÒëͨ¹ý£¿
class Rock{
 public Rock(int i) {
  System.out.println ("Creating Rock " + i);
 }
}
public class SimpleConstructor{
 public