myvector.java

清华大学第二版

import java.util.*;

public class MyVector extends Vector{
	public MyVector(){
		super(1, 1); // 指定 capacity 和 capacityIncrement 取值
	}
	public void addInt(int i){
		addElement(new Integer(i)); 
	}
	public void addFloat(float f){
		addElement(new Float(f));
	}
	public void addString(String s){
		addElement(s);
	}
	public void addCharArray(char a[]){
		addElement(a);
	}

	public void printVector(){
		Object o;
		int length = size();  // 同capacity相比较

		System.out.println("Number of vector elements is "+length+" and they are:");
		for (int i = 0; i < length; i++){
			o = elementAt(i);
			if (o instanceof char[]){
				System.out.println(o); //不好
			//	System.out.println(String.copyValueOf((char[]) o));
			}
			else
				System.out.println(o.toString());
		}
	}
	public static void main (String args[]){
		MyVector v = new MyVector();
		int digit = 5;
		float real = 3.14f;
		char letters[] = {'a', 'b', 'c', 'd'};
		String s = new String ("Hi there!");
	
		v.addInt(digit);
		v.addFloat(real);
		v.addString(s);
		v.addCharArray(letters);

		v.printVector();
	}
}