java动态调用类
package tf;
public class TestPack {
public static void main(String [] args)
{
try
{
IAnimal cAnimal = new bird();
cAnimal.shout();
IAnimal animal =(IAnimal)java.lang.Class.forName("tf.bird").newInstance();
animal.shout();
}
catch (Exception e) {
// TODO: handle exception
}
}
}
//tf.bird 加上包名
//bird.java
package tf;
public class bird implements IAnimal{
public void shout()
{
System.out.println("c c jiji ");
}
}
//IAnimal.java
package tf;
public interface IAnimal {
public void shout();
}
c c jiji
c c jiji
相关文档：
java四舍五入
package Test;
import java.math.BigDecimal; //引入这个包
public class Test {
public static void main(String[] args) {
double i = 3.856;
// 舍掉小数取整
System.out.println("舍掉小数取整:Math.floor(3.856)=" + (int) Math.floor(i));
......
Inner classes, also called Nested Classes, are nothing but classes that are defined within other classes. The nesting is a relationship between classes, not objects.
Inner classes have clearly two benefits, name control & access control. In Java, this benefit is not as important because Java pa ......
在 Java 程序中使用多线程要比在 C 或 C++ 中容易得多，这是因为 Java 编程语言提供了语言级的支持。本文通过简单的编程示例来说明 Java 程序中的多线程是多么直观。读完本文以后，用户应该能够编写简单的多线程程序。
为什么会排队等待?
下面的这个简单的 Java 程序完成四项不相关的任务。这样� ......
import java.awt.*;
import java.awt.event.*;
public class TestFrame {
Frame fm = new Frame();
public void init(){
fm.setSize(300,300);
Button btn = new Button("ok");
fm.add(btn);
btn.addActionListener(ne ......
