java - 在java中的对象数组内启动整数时出现 "Type mismatch: cannot convert from int to Object"错误

Question

public class objArrayPractice {
    public static void main(String[] args) {
        Object ar []= new Object [4];
        ar[0]= 12;
    }
}

当我写 ar[0]= 12;我收到错误:“类型不匹配:无法从 int 转换为 Object”

Answer 1

要将 12 转换为对象，您至少需要 Java 1.5，这称为自动装箱

Autoboxing and unboxing was introduced in Java 1.5 to automatically convert primitive type into boxed primitive( Object or Wrapper class)

因此请确保两台机器上的 Java 版本 >= 1.5