Java method about the console reading numbers or strings

In Java , int a = System.in.read(); this sentence reads a character, and then returns the ASCII of the corresponding character.

For example, if the console input 123 only reads one character 1, and the corresponding ASCII is 49, then output 49, input abc, read a, and the corresponding ASCII is 97, then output 97;

Scanner sc = new Scanner(System.in)

int n = sc.nextInt(); read a number from the console.

String c = sc.next();//Read string from console

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