0、导入Scanner包
import java.util.Scanner;
1、输入一个整数
Scanner input=new Scanner(System.in);
int a = input.nextInt();
2、输入一个字符
Scanner cin=new Scanner(System.in);
String s=cin.nextLine();
char ans=s.charAt(0);
System.out.println(ans);
3、输入一个字符串
Scanner input=new Scanner(System.in);
String str = input.next();
System.out.println(str);
4、输入一行字符串
Scanner input=new Scanner(System.in);
String str = input.nextLine();
System.out.println(str);
5、输入一个数字n,然后输入一行n个数字
Scanner input=new Scanner(System.in);
int n = input.nextInt();
int arr[] = new int[n];
for(int i=0; i<n; i++){
arr[i] = input.nextInt();
}
System.out.println(Arrays.toString(arr));
6、输入一个整数n,然后输入n行
Scanner input = new Scanner(System.in);
String str = input.nextLine();
int n = Integer.parseInt(str);
for(int i=0; i<n; i++){
str = input.nextLine();
System.out.println(str);
}
7、输入任意行(空行截止)
Scanner scanner = new Scanner(System.in);
String nextLine = scanner.nextLine();
while (nextLine != null && !nextLine.equals("")) {
String[] str = nextLine.split(" ");
int[] nums = new int[str.length];
for(int i=0; i<str.length; i++){
nums[i] = Integer.parseInt(str[i]);
}
nextLine = scanner.nextLine();
}