char 该什么用？表示我刚学.虚心请教
import java.util.Scanner;
public class threelianxi {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.print("请输入你的年龄：");
int old = input.nextInt();
System.out.print("请输入你的性别：");
char nan = input.next();
if (old>=5&&old<=7&& nan == "男"){
System.out.println("你可以搬桌子。");
}
else {
System.out.println("！");
}
}
}

[解决办法]
刚刚没有注意，改成下面的

Java code

package csdn.p36;import java.util.Scanner;/** * Created by IntelliJ IDEA. * User: gaoyong * Date: 2011-10-30 * Time: 17:36:27 * To change this template use File | Settings | File Templates. */public class Threelianxi {    public static void main(String[] args){        Scanner input = new Scanner(System.in);        System.out.print("请输入你的年龄：");        int old = input.nextInt();        System.out.print("请输入你的性别：");        String nan = input.next();        if (old>=5&&old<=7&& nan.equals("男")){            System.out.println("你可以搬桌子。");        }        else {            System.out.println("！");        }    }}