Java Variance Test

Variance.java

package org.ktz.example.blog;

import java.util.ArrayList;
import java.util.List;

public class Variance {
    public static void main(String[] args) {
        String str = "";
        Object obj = str;

        List<String> listStr = new ArrayList<>();
//        List<Object> objects = listStr;   // compile error
    }
}