java输入数据的两种方法

1 基本方法
 import java.io.*;
public class input1
{
public static void main(String[] args) throws IOException
{
InputStreamReader reader = new InputStreamReader(System.in);
BufferedReader buf = new BufferedReader(reader);
/* 或者
BufferedReader buf;
buf = new BufferedReader(new InputStreamReader(System.in));
*/
String str;
System.out.print("请输入字符串：");
str = buf.readLine();
System.out.println("你输入的字符串是："+str);
}
}
2 利用Scanner类
import java.util.*;
public class input2
{
public static void main(String[] args)
{
int i1;
double d2;
String s1, s2;
Scanner scanner = new Scanner(System.in);

System.out.print("请输入第一个数：");
i1 = scanner.nextInt();
System.out.print("请输入第二个数：");
d2 = scanner.nextDouble();
System.out.println(i1 + "*" + d2 + "=" + (i1 * d2));

System.out.print("请输入第三个数：");
s1 = scanner.next();
System.out.print("请输入第四个数：");
s2 = scanner.next();
System.out.println("输入的是" + s1 + "和" + s2);
}
}