帮我看一下为什么three前面为什么不能加int可以吗
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
int three = one+two;
System.out.println("three = one +two ==>"+three);
int three += one;
System.out.println("three += one ==>"+three);
int three *= one;
System.out.println("three = *= one ==>"+three);
int three /= one;
System.out.println("three /= one ==>"+three);
int three %=one;
System.out.println("three %=one ==>"+three);
