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package array;
/**
* 1) 数组的插入、删除、按照下标随机访问操作;
* 2)数组中的数据是int类型的;
*
* Author: Zheng
* modify: xing, Gsealy
*/
public class Array {
//定义整型数据data保存数据
public int data[];
//定义数组长度
private int n;
//定义中实际个数
private int count;
//构造方法,定义数组大小
public Array(int capacity){
this.data = new int[capacity];
this.n = capacity;
this.count=0;//一开始一个数都没有存所以为0
}
//根据索引,找到数据中的元素并返回
public int find(int index){
if (index<0 || index>=count) return -1;
return data[index];
}
//插入元素:头部插入,尾部插入
public boolean insert(int index, int value){
//数组中无元素
//if (index == count && count == 0) {
// data[index] = value;
// ++count;
// return true;
//}
// 数组空间已满
if (count == n) {
System.out.println("没有可插入的位置");
return false;
}
// 如果count还没满,那么就可以插入数据到数组中
// 位置不合法
if (index < 0||index > count ) {
System.out.println("位置不合法");
return false;
}
// 位置合法
for( int i = count; i > index; --i){
data[i] = data[i - 1];
}
data[index] = value;
++count;
return true;
}
//根据索引,删除数组中元素
public boolean delete(int index){
if (index<0 || index >=count) return false;
//从删除位置开始,将后面的元素向前移动一位
for (int i=index+1; i<count; ++i){
data[i-1] = data[i];
}
//删除数组末尾元素 这段代码不需要也可以
/*int[] arr = new int[count-1];
for (int i=0; i<count-1;i++){
arr[i] = data[i];
}
this.data = arr;*/
--count;
return true;
}
public void printAll() {
for (int i = 0; i < count; ++i) {
System.out.print(data[i] + " ");
}
System.out.println();
}
public static void main(String[] args) {
Array array = new Array(5);
array.printAll();
array.insert(0, 3);
array.insert(0, 4);
array.insert(1, 5);
array.insert(3, 9);
array.insert(3, 10);
//array.insert(3, 11);
array.printAll();
}
}
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