ArrayList list = new ArrayList();怎么报错了 。
package review;
public class Demo3 {
public static void main(String[] args){
ArrayList list = new ArrayList();
int sum=0;
for(int i=0;i<10;i++){
list.add(i);
}
for(int i=0;i<list.size();i++){
int a = (Integer)list.get(i);
sum+=a;
System.out.println(sum);
}
}
}
怎么会报错：ArrayList cannot be resolved to a type
[解决办法]
package review;
import java.util.ArrayList;
public class Test02 {
public static void main(String[] args) {
ArrayList list = new ArrayList();
int sum = 0;
for (int i = 0; i < 10; i++) {
list.add(i);
}
for (int i = 0; i < list.size(); i++) {
int a = (Integer) list.get(i);
sum += a;
System.out.println(sum);
}
}
}
import java.util.ArrayList;
