Java如何实现通过键盘输入一个数组

System.out.println(“请输入几个数并用逗号隔开：”);
Scanner sc = new Scanner(System.in);
String str = sc.next().toString();//定义一个字符str用于在输入数后面
String[] arr = str.split(",");//字符串数组，存放逗号","
int[] b = new int[arr.length];//int 数组，长度为字符串数组的长度，用于控制数组长度
for(int j = 0; j<b.length;j++) {
b[j] = Integer.parseInt(arr[j]);//录入数据到数组中
System.out.println(b[j]+" ");//打印出来
}

System.out.println(“请输入三个数：”);
Scanner in = new Scanner(System.in);
int[] b=new int[3];
for(int i=0;i<b.length;i++){
b[i]=in.nextInt();
}

package com.基础;
import java.util.Scanner;
public class 二分查找 {
	public static int rank(int key,int[] a)
	{	//数组必须是有序的
		int lo = 0;
		int hi = a.length-1;
		while(lo<=hi)
		{	//被查找的建要么不存在，要么必然存在于a[lo..hi]之中
			int mid = lo + (hi - lo)/2;
			if (key<a[mid])
				hi = mid -1;
			else if (key>a[mid])
				lo = mid +1;
			else    
				return mid;
		}
		return -1;
	}
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		System.out.println("请输入一行数组:");//从键盘接收数据，
		String str = in.next().toString();//输入当成字符串，数之间用“，”隔开
		String[] arr = str.split(",");//以“，”把字符串分成数组
		int[] b = new int[arr.length];//创建一个arr数组长度的数组
		for(int j = 0;j<b.length;j++)
		{
			b[j] = Integer.parseInt(arr[j]); //把arr数组数赋值到b数组中
		}
		System.out.println("请输入要查询的数：");
		int key = in.nextInt();
		int position = rank(key,b);
		if(position == -1) {
			System.out.println("查找的是"+key+",序列中没有该数！");
		}else {
			System.out.println("查找的是"+key+"找到的位置为："+position);
		}
	}
}