Java初学实现动态插入数组

package hello;

import java.util.Scanner;

public class DoubleArray2 {
    public static void main(String []args){
        int[] num = {10,12,23,45,90};

        Scanner sc = new Scanner(System.in);
        while(true) {
            System.out.print("请输入你需要插入的数：");
            int in = sc.nextInt();
            if(in<=num[0]){
                int []num1 = new int[num.length+1];
                for(int j=0;j=1;q--){
                    num[q] = num[q-1];
                }
                num[0] = in;
            }
            else if(in>=num[num.length-1]){
                int []num1 = new int[num.length+1];
                for(int j=0;jin){
                    int []num1 = new int[num.length+1];
                    for(int j=0;ji+1;q--){
                        num[q] = num[q-1];
                    }
                    num[i+1] = in;
                }
            }
            }
            System.out.print("当前数组为：");
            for(int i=0;i