1.使用Scanner
使用时需要引入包import java.util.Scanner;首先定义Scanner对象
Scanner sc = new Scanner(System.in);
如果要输入整数，则 int n = sc.nextInt();
String类型的，则String temp = sc.next();
比如：
import java.util.Scanner;
public class Test {
@SuppressWarnings("resource")
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println(scanner.next());
}
}
2.使用BufferedReader
用前需要引入 import java.io.Reader;
BufferedReader br = new BufferedReader( new InputStreamReader(System.in) );
String input = br.readLine();
比如：
import java.io.*;
public class Test {
public static void main(String[] args) {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(
System.in));
System.out.println(br.readLine());
} catch (IOException e) {
}
}
}