使用Eclipse中的字段生成的构造器中的super关键字的用途是什么？

public class ParentClass {
    private int num;
    
    public ParentClass(int num) {
        this.num = num;
    }
}

public class ChildClass extends ParentClass {
    private int childNum;
    
    public ChildClass(int num, int childNum) {
        super(num); // 调用父类的构造器
        this.childNum = childNum;
    }
}

public class ParentClass {
    private int num;
    
    public ParentClass(int num) {
        this.num = num;
        // 父类的初始化逻辑
    }
}

public class ChildClass extends ParentClass {
    private int childNum;
    
    public ChildClass(int num, int childNum) {
        super(num); // 调用父类的构造器，执行父类的初始化逻辑
        this.childNum = childNum;
        // 子类的特有初始化逻辑
    }
}