判断一个1~999的数字是否为偶数，并输出结果。大家帮我看看这个错哪了！

Question

public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String sum1 = reader.readLine();
int a = Integer.parseInt(sum1);
if(a0&a%2!=0){
System.out.println("一位偶数");
}
else {
System.out.println("一位奇数");
}
if(a=10&a%2==0){
System.out.println("两位偶数");
}
else {
System.out.println("两位奇数");
}
if(a=100&a%2==0){
System.out.println("三位偶数");
}
else {
System.out.println("三位奇数");
}

}

}

Answer 1

if(a<10&&a%2==0){
System.out.println("一位偶数");
}
else if (a<10 && a % 2 == 1) {
System.out.println("一位奇数");
}
else if(a<100&&a%2==0){
System.out.println("两位偶数");
}
else if(a<100&&a%2==1){
System.out.println("两位奇数");
}
else if(a<1000&&a%2==0){
System.out.println("三位偶数");
}
else if(a<1000&&a%2==1){
System.out.println("三位奇数");
}