从键盘输入10个数，计算出正数和负数的个数。

代码如下：

import java.util.Scanner;
public class TestForWhile {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int count=0;
int sum=0;
int zero=0;
for(int i =1;i<=10;i++){
int num = scan.nextInt();
if(num>0){
//System.out.println(num);
count++;
}
else if(num==0){
zero++;
}
else{
//System.out.println(num);
sum++;
}
}
System.out.println("正数个数为:"+count+"个");
System.out.println("负数个数为:"+sum+"个");
System.out.println("0的个数为:"+zero+"个");

}

}