错哪了?????
无需使用int和double再定义
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
three = one+two;
System.out.println("three=one+two==>"+three);
three += one;
System.out.println("three+=one==>"+three);
three -= one;
System.out.println("three-=one==>"+three);
three *= one;
System.out.println("three*=one==>"+three);
}
}为什么不需要INT,有的时候缺需要