用eclipse定义一个z4_1Person 类的子类Student，并创建子类对象，然后显示其信息

好的，您可以参考下面的代码实现：

// 定义 Person 类
class z4_1Person {
    String name;
    int age;

    public z4_1Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public void display() {
        System.out.println("Name: " + name + " , Age: " + age);
    }
}

// 定义 Student 类，继承自 Person 类
class Student extends z4_1Person {
    int grade;

    public Student(String name, int age, int grade) {
        super(name, age);
        this.grade = grade;
    }

    public void display() {
        super.display();
        System.out.println("Grade: " + grade);
    }
}

// 创建 Student 子类对象并显示其信息
public class Main {
    public static void main(String[] args) {
        Student student = new Student("Tom", 18, 90);
        student.display();
    }
}

输出结果为：

Name: Tom , Age: 18
Grade: 90