在Java中更新参数值

public class UpdateParameterExample {
    public static void main(String[] args) {
        int num = 10;
        System.out.println("Before update: " + num);
        updateValue(num);
        System.out.println("After update: " + num);
    }

    public static void updateValue(int value) {
        value = 20;
    }
}

Before update: 10
After update: 10

public class UpdateParameterExample {
    public static void main(String[] args) {
        Person person = new Person("Alice");
        System.out.println("Before update: " + person.getName());
        updateName(person);
        System.out.println("After update: " + person.getName());
    }

    public static void updateName(Person person) {
        person.setName("Bob");
    }
}

class Person {
    private String name;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Before update: Alice
After update: Bob