如何使用与变量名匹配的字符串访问变量并为其赋值

var_name = "my_variable"
value = 10

# 访问变量
print(globals()[var_name])  # 输出: 10

# 赋值给变量
globals()[var_name] = 20
print(my_variable)  # 输出: 20

var varName = "myVariable";
var value = 10;

// 访问变量
console.log(window[varName]);  // 输出: 10

// 赋值给变量
window[varName] = 20;
console.log(myVariable);  // 输出: 20

import java.lang.reflect.Field;

public class Main {
    public static void main(String[] args) throws Exception {
        String varName = "myVariable";
        int value = 10;

        // 访问变量
        Field field = Main.class.getDeclaredField(varName);
        System.out.println(field.get(null));  // 输出: 10

        // 赋值给变量
        field.set(null, 20);
        System.out.println(myVariable);  // 输出: 20
    }

    private static int myVariable;
}