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1）用bufferedReader，导入io包
import java.io.*;
public class A
{
public static void main(String[] args) throws IOException
{
BufferedReader buf;//定义BufferedReader 的对象buf
String str;
...............
buf = new BufferedReader(new InputStreamReader(System.in));//创建buf对象
str = buf.readLine();//用readLine方法读取字符
...............
}
2）用Scanner，导包uti
import java.uti.*; public class A { public static void main(String[] args) { Scanner buf=new Scanner (System.in); int i;double j; System.out.println("请输入一个值："); i=buf.nextInt(); System.out.println("请输入一个值："); j=buf.nextDouble(); ................ }
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原文：http://www.cnblogs.com/lcpholdon/p/3978953.html