Day11 顺序表（一）

1、对象：对象就是类的一个实例，有状态和行为。比如一只狗子是一个对象，狗子的状态有颜色、品种、名字，行为有吃饭、睡觉等。构造了一个具体的对象，我们就可以用其下的方法了；

2、类：就是一个模板，类用来描述一类对象的状态和行为。也可以说类是集合，对象就是集合中的元素， int i 中， int 就是集合， i 就是类型；

3、方法：方法就是行为，一个类可以有很多种方法；

4、包：包可以用来对类和接口进行分类；

5、修饰常量用 final ，final 只能用来修饰类或者方法，对访问控制类型用的有 private 、 protected 、 public 、 default ；

public class SequentialList {

    /**
     * The maximal length of the list. It is a constant.
     */
    public static final int MAX_LENGTH = 10;

    /**
     * The actual length not exceeding MAX_LENGTH.
     */
    int length;

    /**
     * The data stored in an array.
     */
    int[] data;

    /**
     * Construct an empty sequential list.
     */
    public SequentialList() {
        length = 0;
        data = new int[MAX_LENGTH];
    }

    /**
     * Construct a sequential list using an array.
     * 
     * @param paraArray
     */
    public SequentialList(int[] paraArray) {
        data = new int[MAX_LENGTH];
        length = paraArray.length;

        // Copy data.
        for (int i = 0; i < paraArray.length; i++) {
            data[i] = paraArray[i];
        } // Of for i
    }// Of for the second constructor

    /**
     * Overrides the method claimed in Object, the superclas of any class.
     */
    public String toString() {
        String resultString = "";

        if (length == 0) {
            return "empty";
        }

        for (int i = 0; i < length - 1; i++) {
            resultString += data[i] + ", ";
        } // Of for i

        //the last member of resultString
        resultString += data[length - 1];

        return resultString;
    }// Of for toString

    public void reset() {
        length = 0;
    }// Of reset

    /**
     * The entrance of the program.
     * 
     * @param args
     */
    public static void main(String args[]) {
        int[] tempArray = { 1, 4, 6, 9 };
        SequentialList tempFirstList = new SequentialList(tempArray);
        System.out.println("Initialized, the list is: " + tempFirstList.toString());
        System.out.println("Again, the list is: " + tempFirstList);

        tempFirstList.reset();
        System.out.println("After reset, the list is: " + tempFirstList);
    }// Of main
}// Of class SequentialList