java - 如何使用Java将数据从一个ArrayList添加到另一个ArrayList？

Question

所以我有一个ArrayList“NamedShape”，然后我有另一个ArrayList“Connection”，它由两个字段组成，都是“NamedShape”，我想将从ArrayList“NamedShape”检索到的数据添加到ArrayList“Connection”

这是我的 ArrayList“NamedShape”

ArrayList<NamedShape> shapes = new ArrayList<NamedShape>();


public class NamedShape {
    private String name;
    private Shape shape;
    public NamedShape( String name, Shape shape ){
        this.name = name;
        this.shape = shape;
    }
    public String getName(){
        return name; 
    }
    public Shape getShape(){ 
        return shape; 
    }
}

这是我的 ArrayList“连接”

ArrayList<Connection> con = new ArrayList<Connection>();

   public class Connection     {
    private NamedShape namedShape1;
    private NamedShape namedShape2;
    public Connection(NamedShape namedShape1,NamedShape namedShape2){
        this.namedShape1 = namedShape1;
        this.namedShape2 = namedShape2;
    }

    public NamedShape getNamedShape1(){
        return namedShape1;
    }
    public NamedShape getNamedShape2(){
        return namedShape2;
    }

    public void setNameShape1(){
        this.namedShape1 = namedShape1;
    }

    public void setNameShape2(){
        this.namedShape2 = namedShape2;
    }
   }

所以我想添加从 ArrayList“NamedShape”获取的数据并将其添加到 ArrayList“Connection”。这是我用来从 ArrayList“NamedSpace”检索数据的方法，但将数据添加到“Connection”时则不起作用。

for(int a=0;a<var;a++) 
{  
Shape s = shapes.get(a).getShape();
String n = shapes.get(a).getName();

// add data to ArrayList "Connection" 
//I've tried this but it does not work.

con.add( new Connection(new NamedShape(con.setNameShape1(n,s))));

}

你能帮我解决这个问题吗？

已编辑

所以我下面的代码应该允许用户绘制形状，并且当绘制形状时，用户输入保存在数组“NamedShape”中的形状的名称。然后，当“NamedShape”的大小大于 1 时，它会检查其他形状与该线的碰撞。通常应该只有 2 次碰撞，即与线的开头和线的结尾。如果存在与该行，它检查是否碰撞==1，它保存碰撞到NamedShape1下的ArrayList“Connection”的形状，如果碰撞==2，它保存它到相同的索引，但在“NamedShape2”下请做你最擅长的事!!救命!

if (currentAction == 3) {
                            boolean collision = false;
                            int collisions =0;
                            aShape = drawEllipse(drawStart.x, drawStart.y,
                             e.getX(), e.getY());
                            
                            
                             String text = (String) JOptionPane.showInputDialog(DrawingBoard, "Enter name of Attribute:");
                            if (text == null || text.isEmpty()) {
                                    text = (String) JOptionPane.showInputDialog(DrawingBoard, "You must enter a valid name!  Please try again:");
                                                                    
                            }
                            else{
                            
                            
                            shapes.add( new NamedShape( text,
                            aShape ) );    
                                                        
                          
                            //returns the coordinates of each rectangle
                            //System.out.println(aShape);
                         int var = shapes.size();
                         System.out.println("Array index"+var);
                         if(var>1){
                            
                            for(int i=0;i<var;i++){ 
                          
                            Shape s = shapes.get(i).getShape();

                           if (s instanceof Line2D) { 
                               
                               System.out.println("Index of line is: "+i);   
                               double x = (s.getBounds2D().getX());
                               double y = (s.getBounds2D().getY());
                               double w = (s.getBounds2D().getWidth());
                               double h = (s.getBounds2D().getHeight());
                               
                          for(int a=0;a<var;a++) {                              
                              Shape f = shapes.get(a).getShape();
                              String nana = shapes.get(a).getName();
                                                           
                                                            
                              if (f instanceof Ellipse2D){
                               double x1 = (f.getBounds2D().getX());
                               double y1 = (f.getBounds2D().getY());
                               double w1 = (f.getBounds2D().getWidth());
                               double h1 = (f.getBounds2D().getHeight());
                               
                               if(s.intersects(x1, y1, w1, h1)){
                                collision = true;
                                collisions ++;
                               if (collisions==1) {    
                                                                    
                              // I want to add data of f and nana from arraylist of NamedShape and adds it
                              //to arraylist connection.
                              // if collsions=1, it adds it to NamedShape1 else if collisions = 2 it add it to NamedShape2
                             
                              //not sure if this will work     
                              con.add( new Connection(new NamedShape(nana, f), new NamedShape(null,null)));
                                                                
                                }
                              
                                System.out.println("Line "+ i +" is linked to "+nana);
                                
                        } 
                               else{
                                collision = false;
                                System.out.println("LINE(E) " + i + "DO NOT COLLIDE WITH ELLIPSE OF INDEX= "+a);
                                
                            }
                                
                              }
                              
                          }                             
                            
                        }       
                      
                        }    
                         }
                            
                            shapeStroke.add(strokeColor);
                            drawStart = null;
                            drawEnd = null;
                            repaint();
                            }
                           
                        }

Answer 1

为什么要在连接对象中启动 NameShape1 对象之前设置它？

new NamedShape(con.setNameShape1(n,s)

您可以尝试初始化 NameShape 对象并将其传递给 Connection 的构造函数吗？

下面几行会更多。con.add( new Connection(new NamedShape("abc", shapObj), new NamedShape("xyz",shapObj)));

或者看看是否可以在 Connection 对象中初始化它，并且其中一个方法返回给定的对象。