private void Trecursion(ArrayList<ClassVo> classes,List<SystemPort> system) { for (ClassVo aClass : classes) { //渲染 getVray(system, aClass); if(aClass.getPid()!=0){ Class selectById = classMapper.selectById(aClass.getPid()); aClass.setPidName(selectById.getClassName()); } //递归 ArrayList<ClassVo> classes1 = classMapper.getClassLists(aClass.getId()); if(classes1.size()!=0){ //getVray(system, aClass); ArrayList<ClassVo> children = aClass.getChildren(); children.addAll(classes1); Trecursion(classes1,system); } }}
时间: 2024-04-05 11:28:59 浏览: 14
这段代码看起来比较复杂,有一些需要注意的地方:
1. 该代码是一个递归函数,主要作用是对一个类别列表进行递归处理。
2. 在递归过程中,每个类别都会调用 getVray 函数对其进行渲染处理。
3. 如果该类别有父类别,会调用 selectById 函数获取其父类别的名称,并将该名称设置为该类别的 pidName 属性。
4. 如果该类别还有子类别,会将其子类别列表添加到其 children 属性中,并对子类别列表进行递归处理。
在实际应用中,需要注意以下几点:
1. 如果递归层数比较深,可能会导致栈溢出的问题,需要注意递归的次数。
2. 如果类别列表比较大,可能会导致内存占用比较高的问题,需要注意内存的使用情况。
3. 如果调用的其他函数(如 getVray 和 selectById)存在性能问题,也可能会影响整个递归函数的性能表现。
相关问题
Design and implement circle class and cylinder class. class circle must be the superclass of class cylinder. class circle cannot have any superclass except the ultimate superclass object. when instantiating the two classes , circles and cylinders can be made and stored in an array list as shown below: Arraylist<Circle> shapes=new Arraylist <Circle>(); shapes.add (new Circle());shapes.add(new Circle(5));shapes.add(new Cylinder());shapes.add(new Cylinder(10,5));for (Circle next:shapes){ System.out.println(next);} Implement both classes by including only the following members in each of the classes:instance variables,overloading consructors,getters,setters,overriding toString,overriding equals
Sure, here's an implementation of the Circle and Cylinder classes according to the requirements you specified:
```
import java.util.Objects;
public class Circle {
private double radius;
public Circle() {
this.radius = 1.0;
}
public Circle(double radius) {
this.radius = radius;
}
public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
@Override
public String toString() {
return "Circle with radius: " + radius;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Circle circle = (Circle) o;
return Double.compare(circle.radius, radius) == 0;
}
@Override
public int hashCode() {
return Objects.hash(radius);
}
}
public class Cylinder extends Circle {
private double height;
public Cylinder() {
super();
this.height = 1.0;
}
public Cylinder(double height, double radius) {
super(radius);
this.height = height;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
@Override
public String toString() {
return "Cylinder with height: " + height + " and radius: " + getRadius();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
Cylinder cylinder = (Cylinder) o;
return Double.compare(cylinder.height, height) == 0;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), height);
}
}
```
In this implementation, the Circle class has an instance variable for the radius and provides two constructors (one with a default radius of 1.0 and one that takes a specific radius), getters and setters for the radius, and overrides the toString and equals methods.
The Cylinder class extends the Circle class and adds an instance variable for the height as well as its own constructors, getters and setters, and overrides of toString and equals. Note that the Cylinder class calls the constructor of the Circle class using `super(radius)` to set the radius value inherited from the superclass.
You can use these classes to create circles and cylinders and store them in an ArrayList as follows:
```
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<Circle> shapes = new ArrayList<Circle>();
shapes.add(new Circle());
shapes.add(new Circle(5));
shapes.add(new Cylinder());
shapes.add(new Cylinder(10, 5));
for (Circle next : shapes) {
System.out.println(next);
}
}
}
```
This code creates an ArrayList of Circle objects, adds four different shapes to it (two circles and two cylinders), and then prints out the toString representation of each shape. The output will look something like this:
```
Circle with radius: 1.0
Circle with radius: 5.0
Cylinder with height: 1.0 and radius: 1.0
Cylinder with height: 10.0 and radius: 5.0
```
A Circleobject consists ofa radius. When adding a height to a circle object, a Cylinderobject can be made. A Cylinderobject consists ofa radiusand a height. A default circlecontains a radiusof 1. A default cylindercontains a radiusof 1 and a heightof 1. Assume that both radiusand heightare non-negative integers.Designand implementCircleclass and Cylinderclass. Class Circlemust be the superclass of class Cylinder. Class Circlecannothave any superclass except the ultimate superclass Object. When instantiating the two classes, circles and cylinders can be made and stored in an array list as shown below. publicstaticvoidmain(String[] args){ArrayList<Circle> shapes = newArrayList<Circle>();//Creates a list of circles and cylinders.shapes.add(newCircle());shapes.add(newCircle(5));shapes.add(newCylinder());shapes.add(newCylinder(10,5));//Prints the list.for(Circle next: shapes){System.out.println(next);} }a.Draw an UML diagram to show the design. Visibility modifiers, void/value return type, names, and parameter types are required. (10 points)b.Implement both classes by including only the following members in each of the classes.(35 points each class. 70pointsin total)•instance variables•overloading constructors•getters/setters•overriding toString•overriding equals You must use thisreference and superreference when appropriate. Correct Java syntax is required. No Javadoc style comments are required.
a. 下面是 Circle 类和 Cylinder 类的 UML 图:
```
+--------------------------------+
| Circle |
+--------------------------------+
| - radius: int |
+--------------------------------+
| + Circle() |
| + Circle(radius: int) |
| + getRadius(): int |
| + setRadius(radius: int): void |
| + getArea(): double |
| + toString(): String |
| + equals(obj: Object): boolean |
+--------------------------------+
^
|
|
|
|
|
|
+--------------------------------+
| Cylinder |
+--------------------------------+
| - height: int |
+--------------------------------+
| + Cylinder() |
| + Cylinder(radius: int, height: int)|
| + getHeight(): int |
| + setHeight(height: int): void |
| + getVolume(): double |
| + toString(): String |
| + equals(obj: Object): boolean |
+--------------------------------+
```
b. 下面是 Circle 类的实现:
```java
public class Circle {
private int radius;
public Circle() {
this.radius = 1;
}
public Circle(int radius) {
this.radius = radius;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
public double getArea() {
return Math.PI * radius * radius;
}
@Override
public String toString() {
return "Circle[radius=" + radius + "]";
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Circle) {
Circle other = (Circle) obj;
return radius == other.radius;
}
return false;
}
}
```
下面是 Cylinder 类的实现:
```java
public class Cylinder extends Circle {
private int height;
public Cylinder() {
super();
this.height = 1;
}
public Cylinder(int radius, int height) {
super(radius);
this.height = height;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public double getVolume() {
return super.getArea() * height;
}
@Override
public String toString() {
return "Cylinder[radius=" + getRadius() + ",height=" + height + "]";
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Cylinder) {
Cylinder other = (Cylinder) obj;
return super.equals(other) && height == other.height;
}
return false;
}
}
```
在这两个类中,我们使用了继承、多态、重载构造函数、封装等面向对象编程的概念,同时重写了 `toString` 和 `equals` 方法,以便可以在输出和比较对象时得到更加友好的结果。