package Array;
import java.util.Arrays;
public class MyArray {
int[] elements;
public MyArray() {
elements = new int[0];
}
public int getSize(){
return elements.length;
}
//在原数组末尾添加元素,并返回该元素
public int append(int data){
int[] newArray = new int[elements.length+1];
for (int i = 0; i < elements.length; i++){
newArray[i] = elements[i];
}
newArray[elements.length] = data;
elements = newArray;
return data;
}
//打印数组
public void printArray(){
System.out.println(Arrays.toString(elements));
}
//删除某一索引元素
public void pop(int index){
if (index < 0 || index > elements.length-1){
throw new RuntimeException("索引超出范围");
}
else{
int[] newArray = new int[elements.length-1];
for (int i = 0; i < newArray.length; i++){
if (i < index){
newArray[i] = elements[i];
}
else{
newArray[i] = elements[i+1];
}
}
elements = newArray;
}
}
//去指定索引的元素
public int getElement(int index){
return elements[index];
}
//在某一位置插入元素
public void insertElement(int index, int data){
if (index < 0 || index > elements.length-1){
throw new RuntimeException("索引超出范围");
}
else{
int[] newArray = new int[elements.length+1];
for (int i = 0; i < newArray.length; i++){
if (i < index){
newArray[i] = elements[i];
}
else if (i == index){
newArray[i] = data;
}
else{
newArray[i] = elements[i-1];
}
}
elements = newArray;
}
}
//替换数组中某个位置的元素
public void replaceElement(int index, int data){
if (index < 0 || index > elements.length-1){
throw new RuntimeException("索引超出范围");
}
else{
int[] newArray = new int[elements.length];
for (int i = 0; i < elements.length; i++){
if (i != index){
newArray[i] = elements[i];
}
else{
newArray[i] = data;
}
}
elements = newArray;
}
}
public static void main(String[] args) {
//测试
MyArray a = new MyArray();
a.append(222);
a.append(123);
a.append(124);
a.append(126);
a.append(12);
a.append(3);
a.append(1);
a.replaceElement(2,0);
a.insertElement(5,100);
a.pop(1);
System.out.println(a.getElement(5));
a.printArray();
}
}
implementación Java de algunas operaciones simples de matriz
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Origin blog.csdn.net/weixin_44632459/article/details/105220726
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