java中Vector有什么用
Vector的用法
马克-to-win:Vector和ArrayList很类似,前面讲了二者的区别,就在于同步的问题上,Vector的使用是非常简单的:先创建一个,再用addElement()置入对象,以后用elementAt()取得那些对象
例:3.1.1
import java.io.*;
import java.util.*;
public class TestMark_to_win {
public static void main(String args[]) {
Vector v = new Vector();
for (int i = 0; i < 4; i++) {
v.addElement(new Integer(i));
}
Iterator it = v.iterator();
while (it.hasNext()) {
System.out.println("" + it.next());
}
if (v.contains(new Integer(2))) {
System.out.println("it has 2");
}
Enumeration e = v.elements();
while (e.hasMoreElements()) {
System.out.println(e.nextElement());
}
v.removeElementAt(2);
v.addElement("kkk");
v.addElement(new Double(1.1));
/*the following statement is a must, because e has ever gone to the end
of the queue.*/
e = v.elements();
while (e.hasMoreElements()) {
System.out.println(e.nextElement());
}
}
}
result is:
0
1
2
3
it has 2
0
1
2
3
0
1
3
kkk
1.1