import java.util.*;
public class ArrayListTest {
public static void main(String[] args) {
List<Integer> list1 = new ArrayList<>();
ArrayList<Integer> list2 = new ArrayList<>();
}
}
You can call your class ArrayList but it is a very bad idea. Better to rename it. Second, you have two variables with the same name, which is forbidden. A correct code looks like:
import java.util.*;
public class ArrayListTest {
public static void main(String[] args) {
List<Integer> list1 = new ArrayList<>();
ArrayList<Integer> list2 = new ArrayList<>();
}
}
import java.util.*;
public class MyArrayList {
public static void main(String[] args) {
List<Integer> List = new ArrayList<>();
ArrayList<Integer> List = new ArrayList<>();
}
}
Rename class name to something else.
ArrayList is a class that came with java.util package Since you imported java.util.* , the program can't select this class or the class from util package.
import java.util.*;
public class MyArrayList {
public static void main(String[] args) {
List<Integer> List = new ArrayList<>();
ArrayList<Integer> List = new ArrayList<>();
}
}
You are using the same name, so in the computers storage they would overwrite each other (in theory), if the compiler wouldn't intervene. Just add an indicator to your two variables, like '1' and '2'!
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您可以调用类
arrayList，但这是一个非常糟糕的主意。最好重命名。其次，您有两个具有相同名称的变量，这是禁止的。正确的代码看起来像：You can call your class
ArrayListbut it is a very bad idea. Better to rename it. Second, you have two variables with the same name, which is forbidden. A correct code looks like:将课堂名称重命名为其他。
arrayList是带有java.util软件包的类由于您导入了
java.util。*，因此程序无法从util软件包中选择此类或类。Rename class name to something else.
ArrayListis a class that came withjava.utilpackageSince you imported
java.util.*, the program can't select this class or the class fromutilpackage.您使用的是相同的名称，因此在计算机存储中，如果编译器不干预，它们将相互覆盖（理论上）。只需在您的两个变量中添加一个指示器，例如“ 1”和“ 2”！
You are using the same name, so in the computers storage they would overwrite each other (in theory), if the compiler wouldn't intervene. Just add an indicator to your two variables, like '1' and '2'!