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//Ô´´úÂ룺
class A {
         public String show(D obj){
                return ("A and D");
         }
         public String show(A obj){
                return ("A and A");
         }
         public String show(C obj){
               return ("A and C");
         }
}
class B extends A{
         public String show(B obj){
                return ("B and B");
         }
         public String show(A obj){
                return ("B and A");
         }
         public String show(C obj){
                return ("B and C");
  }
}
class C extends B{}
class D extends B{}
class Test{     
   public static void main(String[] args){
      A a1 = new A();
      A a2 = new B();
      B b = new B();
      C c = new C();
      D d = new D();
      System.out.println(a1.show(b));  &nb


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ͨ¹ýjava.awt.RobotµÄcreateScreenCapture½ØÆÁ¡£
    public static void captureScreen(String fileName) throws Exception {
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Rectangle screenRectangle = new Rectangle(screenSize);
& ......

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2¡¢C/C++»Øµ÷Java½Ó¿Ú
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String str1="hello";//´´½¨Ò»¸ö¶ÔÏóhello£¬²»»á±ä£»
System.out.println(str1);
str1+=" world!";//Á½¸ö×Ö·û´®¶ÔÏóÕ³Õ³£¬ÏµÍ³Æäʵ´´½¨ÁËÒ»¸öеĶÔÏ󣬰ÑStr1µÄÖ¸Ïò¸ÄÁË£¬Ö¸ÏòеĶÔÏó£»hello¾Í          & ......
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