IO流_三种方式实现键盘录入

package cn.itcast_04;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/*
 * System.in 标准输入流。是从键盘获取数据的
 * 
 * 键盘录入数据:
 *     A:main方法人args接受参数
 *       java HelloWorld hello world java
 *     B:Scanner(JDK5以后的)
 *       Scanner sc = new Scanner(System.in);
 *       String line = sc.nextLine();
 *       int i = sc.nextInt();
 *     C:通过字符缓冲流包装标准输入流实现
 *       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 */
public class SystemInDemo {
  public static void main(String[] args) throws IOException {
    // 封装数据源
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    // 获取数据
    System.out.print("请输入一个字符串:");
    String line = br.readLine();
    System.out.println("您输入的字符串是:" + line);
    System.out.print("请输入一个整数:");
    line = br.readLine();
    int i = Integer.parseInt(line);
    System.out.println("你输入的整数是:" + i);

    // 释放资源
    br.close();
  }
}