import java.util.Scanner;
public class Test
{

public static void main(String arg[])
{
Scanner input = new Scanner(System.in);
System.out.print("输入整数:");
int i = input.nextInt();
System.out.println("i=" + i);

System.out.print("输入字符串:");
String s = input.next();
System.out.println("s=" + s);

System.out.print("输入浮点数:");
float f = input.nextFloat();
System.out.println("f=" + f);

System.out.print("输入单个字符:");
char b = input.nextChar();／／这样写为什么是错误的．请教大嘴大哥．．
System.out.println("b=" + b);
}
}

那怎么输入单个字符??