程序开头加条:
import java.util.Vector;
import java.util.Vector;
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C:\j2sdk1.4.0\lib\comm.jar;
C:\j2sdk1.4.0\lib\dt.jar;
C:\j2sdk1.4.0\lib\tool.jar;
C:\j2sdk1.4.0\lib\htmlconverter.jar;
C:\j2sdk1.4.0\bin;
C:\j2sdk1.4.0\lib\acme.jar;
C:\j2sdk1.4.0\lib\cpsdk.jar;
C:\j2sdk1.4.0\lib\MinML.jar
上面就是我的全部类路径了。可是我没有发现什么异常呀!郁闷!
到現在還沒弄明白是什么原因。
import java.util.*;
//import java.util.Vector;class Mouse {
private int mouseNumber;
Mouse(int i) {
mouseNumber = i;
}
// Magic method:
public String toString() {
return "This is Mouse #" + mouseNumber;
}
void print(String msg) {
if(msg != null) System.out.println(msg);
System.out.println(
"Mouse number " + mouseNumber);
}
}class MouseTrap {
static void caughtYa(Object m) {
Mouse mouse = (Mouse)m; // Cast from Object
mouse.print("Caught one!");
}
}public class WorksAnyway {
public static void main(String[] args) {
Vector mice = new Vector();
for(int i = 0; i < 3; i++)
mice.addElement(new Mouse(i));
for(int i = 0; i < mice.size(); i++) {
// No cast necessary, automatic call
// to Object.toString():
System.out.println(
"Free mouse: " + mice.elementAt(i));
MouseTrap.caughtYa(mice.elementAt(i));
}
}
} ///:~
Free mouse: This is Mouse #0
Caught one!
Mouse number 0
Free mouse: This is Mouse #1
Caught one!
Mouse number 1
Free mouse: This is Mouse #2
Caught one!
Mouse number 2我估计是你的JDK有问题了,或者是classpath问题.
这段代码没有问题.