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法律学Java 中 Vector 的尺寸和容量之间的区别是什么？
向量的尺寸表示向量中的组件数。向量的容量表示向量可以容纳的最大元素数。
示例
import java.util.*;
public class VectorDemo {
public static void main(String args[]) {
Vector v = new Vector(3, 2);
System.out.println("Initial size: " + v.size());
System.out.println("Initial capacity: " + v.capacity());
v.addElement(new Integer(1));
v.addElement(new Integer(2));
v.addElement(new Integer(3));
v.addElement(new Integer(4));
System.out.println("Capacity after four additions: " + v.capacity());
v.addElement(new Double(5.45));
System.out.println("Current capacity: " + v.capacity());
v.addElement(new Double(6.08));
v.addElement(new Integer(7));
System.out.println("Current capacity: " + v.capacity());
v.addElement(new Float(9.4));
v.addElement(new Integer(10));
System.out.println("Current capacity: " + v.capacity());
v.addElement(new Integer(11));
v.addElement(new Integer(12));
System.out.println("First element: " + (Integer)v.firstElement());
System.out.println("Last element: " + (Integer)v.lastElement());
if(v.contains(new Integer(3)))
System.out.println("Vector contains 3.");
Enumeration vEnum = v.elements();
System.out.println("
Elements in vector:");
while(vEnum.hasMoreElements())
System.out.print(vEnum.nextElement() + " ");
System.out.println();
}
}输出
Initial size: 0 Initial capacity: 3 Capacity after four additions: 5 Current capacity: 5 Current capacity: 7 Current capacity: 9 First element: 1 Last element: 12 Vector contains 3. Elements in vector: 1 2 3 4 5.45 6.08 7 9.4 10 11 12
更新于： 30-Jul-2019
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