定义整数数组操作类

package com.kaishengit;

/**
 * @author Wgs
 * @version 1.0
 * @create：2018/05/02 定义整数数组操作类
 */
public class Array {
    // 控制数组脚标
    private int foot = 0;
    // 保存的数据
    private int data[];

    // 由外部传入大小
    public Array(int len) {
        if (len > 0) {
            this.data = new int[len];
        } else {
            // 维持一个大小
            this.data = new int[1];
        }
    }

    public boolean add(int num) {
        // 有位置
        if (this.foot < this.data.length) {
            // 保存数据
            this.data[this.foot++] = num;
            return true;
        }
        return false;
    }

    // 取得全部数据
    public int[] getData() {
        return this.data;
    }

    // 数组增长
    public void increment(int num) {
        int[] newArr = new int[this.data.length + num];
        System.arraycopy(this.data, 0, newArr, 0, this.data.length);
        // 改变引用
        this.data = newArr;
    }
}

class TestDemo {
    public static void main(String[] args) {
        Array array = new Array(5);
        System.out.println(array.add(8)+",");
        System.out.println(array.add(12)+",");
        System.out.println(array.add(2)+",");
        System.out.println(array.add(5)+",");
        System.out.println(array.add(3)+",");
        System.out.println(array.add(9)+",");
        array.increment(3);
        System.out.println(array.add(9)+",");
        System.out.println(array.add(0)+",");
        System.out.println(array.add(7)+",");
        System.out.println(array.add(5)+",");

        int result[] = array.getData();
        for (int r : result){
            System.out.println(r);
        }
    }
}