arraylistdemo.java

来自「Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想」· Java 代码 · 共 31 行

package chapter8;

import java.util.*;

class ArrayListDemo
{
    public static void main(String args[])
    {
        ArrayList al = new ArrayList();
        System.out.println("Initial size of al: " + al.size());
        al.add("C");
        al.add("A");
        al.add("E");
        al.add("B");
        al.add("D");
        al.add("F");
        al.add(1, "A2");
        System.out.println("Size after additions: " + al.size());
        System.out.println("Contents of al: " + al);
        al.remove("F");
        al.remove(2);
        System.out.println("Size after deletions: " + al.size());
        System.out.println("Contents of al: " + al);
        // 由Array得到数组
        Object ia[] = al.toArray();
        String strSum = “”;
        for(int i=0; i<al.length; i++)
            strSum = strSum + (String)al[i];
        System.out.println("strSum is: " + strSum);
    }
}