How to enter an array from the keyboard in java

Knowledge supplement:

Scanner class’s next() and nextLine() methods Get the input string.

toString() The method is used to return the Number object value represented by a string.

The first method: (does not limit the length of the input array)

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();
  String[] arr  = str.split(",");
  int[] b = new int[arr.length];
  for(int j = 0; j<b.length;j++) {
   b[j] = Integer.parseInt(arr[j]);
   System.out.println(b[j]+" ");
  }

In this way we can input through the keyboard, the results are as follows:

Second method: (limit the number of inputs)

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();
}

Explain the next() and nextLine() methods in the Scanner class The difference:

The difference between next() and nextLine() is very clear. The next() method starts scanning when it encounters the first valid character (not a space or a newline character). When the delimiter or terminator (space or newline character) is reached, the scan ends and the scanned content is obtained. That is to say, the next() method is used to obtain a single string without spaces and newline characters.

Recommended tutorial: Getting started with java development

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