易截截图软件、单文件、免安装、纯绿色、仅160KB

Java与C++的多态

没有必要用一堆绕口的形容词来描述什么叫多态,只举出几个关键点。
    设:gun为父类,shootgun和pistol为gun的子类。
    Java:
    class gun {
        void shoot() {
            System.out.println("gun shoot");
        }
    }
    class shootgun extends gun {
        void shoot() {
            System.out.println("shootgun shoot");
       }
    }
    class pistol extends gun {
       void shoot() {
            System.out.println("pistol shoot");
        }
    }
    C++:
    class gun
    {
        void shoot()
        {
            cout << "gun shoot" << endl;
        }
    };
    class shootgun : gun
    {
        void shoot()
        {
            cout << "shootgun shoot" << endl;
        }
    };
    class pistol : gun
    {
        void shoot()
        {
            cout << "pistol shoot" << endl;
      &n


相关文档:

[转]Does Java pass by reference or pass by value?

http://www.javaworld.com/javaworld/javaqa/2000-05/03-qa-0526-pass.html
Does Java pass by reference or pass by value?
Why can't you swap in Java?
By Tony
Sintes, JavaWorld.com, 05/26/00

Print
Email
Feedback
Resources
Discuss
(76)
Digg
Reddit
SlashDot
Stumble
......

java 错误代码提示

 //=============================输出奇数
public class OddTest {
public static boolean isOdd(int i){
return i % 2 != 0; //比较 i % 2 == 0;注: -1%2 = -1
}
public static void main(String[] args) {
for(int i = -10; i <= 10; i++) {
System.out.println(isOdd(i));
}
}
}
// ......

oracle 返回一个java对象,和返回多个java对象的方法

返回多个对象:
    PROCEDURE AUTO_SEL_INVOICE_DETAIL(
  P_RESULT_LIST OUT SYS_REFCURSOR) AS
    BEGIN
    OPEN P_RESULT_LIST FOR
   SELECT DISTINCT CC.CHARGE_COLLECTION_ID CHARGE_COLLECTION_ID, CC.COLLECT_DATE COLLECT_DATE, C ......

Java SWT 窗口居中对齐

public static void CentreWnd(Shell shell){
int width = shell.getMonitor().getClientArea().width;
int height = shell.getMonitor().getClientArea().height;
int x = shell.getSize().x;
int y = shell.getSize().y;
if (x > width) {
shell.getSize().x = width;
}
if (y > height) ......

用Java代码查看系统默认字符集编码

public class EchoDefaultSystemEncoding
{
    public static void main(String[] args)
    {
           String encoding = System.getProperty("file.encoding");
           System ......
© 2009 ej38.com All Rights Reserved. 关于E健网联系我们 | 站点地图 | 赣ICP备09004571号