关于java实例化的一些疑惑

Question

package three_part;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class ServerUI extends JFrame{ //界面类
 JTextArea mainArea;
 JTextArea sendArea;
 SvrCom server;
 public ServerUI(){
  super("服务器端");
  Container contain =getContentPane();
  contain.setLayout(new BorderLayout());
  mainArea = new JTextArea();
  JScrollPane mainAreaP= new JScrollPane(mainArea);
  JPanel panel =new JPanel(new BorderLayout());
  sendArea =new JTextArea(3,8);
  JButton sendBtn = new JButton("发送");
  sendBtn.addActionListener(new ActionListener(){

  public void actionPerformed(ActionEvent e) {
   server.sendMsg(sendArea.getText());
   mainArea.append("【服务器】"+sendArea.getText()+"\n");
            sendArea.setText("");
  }
  });
  JPanel tmpPanel=new JPanel();
  tmpPanel.add(sendBtn);
  panel.add(tmpPanel,BorderLayout.EAST);
  panel.add(sendArea,BorderLayout.CENTER);
  contain.add(mainAreaP,BorderLayout.CENTER);
  contain.add(panel,BorderLayout.SOUTH);
  setSize(500,300);
  setVisible(true);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
 
 public static void main(String[]agrs){  
  ServerUI ui= new ServerUI();
  SvrCom svrCom= new SvrCom(ui);
 }

public void setServer(SvrCom svrCom) {
   this.server = svrCom;  
}
}

package three_part;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SvrCom {    //通讯类
 Socket client;
 ServerSocket soc;
 BufferedReader in;
 PrintWriter out;
 ServerUI ui;
 public SvrCom(ServerUI ui) {
     this.ui=ui;
     ui.setServer(this);
    
      try {
   soc = new ServerSocket(8888);
    System.out.println("启动");
       client= soc.accept();
       System.out.println("连接成功");
       in=new BufferedReader(new InputStreamReader(client.getInputStream()));
       out=new PrintWriter(client.getOutputStream(),true);
       
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
public void run(){
 String msg="";
 while(true){
  try {
   msg=in.readLine();
  } catch (IOException e) {
   e.printStackTrace();
  }
  if(msg!=null&&msg.trim()!=""){
   System.out.println("> >"+msg);
   ui.mainArea.append(msg+"\n");
  }
 }
}
public void sendMsg(String msg){
 try{
 out.println("[【服务器】"+msg);
 }catch(Exception e){
  System.out.println(e);
 }
}
}



public void setServer(SvrCom svrCom) {    this.server = svrCom;   }这个是将server实例化吗？ 如果不是，加粗下划线得那一段是怎么实现？？

Answer 1

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

Answer 2

是的，通过这个方法，外界的调用者能把SvrCom的实例传进来，SvrCom类的构造方法里就把自己穿了过去。若解惑，望采纳