在Java程序中修改圖形？

Question

我寫了下面的java程序，但我似乎無法讓它做我想做的事情。我想在java中製作兩個盒子。在兩個盒子裏都應該有一個綠色的盒子，裏面包含一個人的名字，另一個盒子和一個情緒盒子，當情緒高興的時候它會變成紅色，否則它是灰色的。像這樣的事情，我需要讓我的Facebook_Graphics.java做

我寫了下面的類，但我我可以做什麼。

import java.awt.*; 


    import jpb.*; 

    public class Facebook_Graphics{ 
     private String name; 
     private String content; 
     DrawableFrame df; 
     private Graphics g; 

     public Facebook_Graphics(String nm){ 
      content = "undefined"; 
      name = nm;   

      // Create drawable frame   
      df = new DrawableFrame(name); 
      df.show(); 
      df.setSize(200, 150); 

      // Obtain graphics context 
      g = df.getGraphicsContext(); 

      // display name 
      g.drawString(name+"'s mood is undefined.", 20, 75); 

      // Repaint frame 
      df.repaint();   
     } 

     public void setContent(String newContent){ 
     content = newContent; 

      if(content.equals("happy")){ 
       g.setColor(Color.red);   
       g.fillRect(0, 0, 200, 150); 
       g.setColor(Color.black); 

       // display mood   
       g.drawString(name+"'s mood is:"+ "happy", 20, 75); 
      } 
      else{ 
       g.setColor(Color.white); 
       g.fillRect(0, 0, 200, 150); 
       g.setColor(Color.black); 
       g.drawString(name+"'s mood is:"+ content, 20, 75); 
      } 
      // Repaint frame 
      df.repaint(); 
     } 

     public String getContent(){ 
     return content; 
     } 
    } 


    public class FacebookPerson_Graphics{ 
     private String myName; 
     private String myMood; 
     private Facebook_Graphics myfacebook; 

     public FacebookPerson_Graphics(String name){ 
      myName = name; 
      myfacebook = new Facebook_Graphics(myName); 
     } 

     public String getName(){ 
      return myName; 
     } 

     public void setMood(String newMood){ 
     myMood = newMood; 
     myfacebook.setContent(myMood); 
     } 

     public String getMood(){ 
      return myMood; 
     } 
    } 




    import jpb.*; 
    @SuppressWarnings("deprecation") 
    public class testFacebook_Graphics{   
     public static void main (String[] args){ 
     // Prompt user to enter the number of facebookpresons 
     SimpleIO.prompt("Enter the number of facebookpresons to be created: "); 
     String userInput = SimpleIO.readLine(); 
     int numP = Integer.parseInt(userInput); 

     FacebookPerson_Graphics[] fbp = new FacebookPerson_Graphics[numP]; 

     //Ask the user to enter the name for each person, and create the persons 
     for(int i=0; i< numP; i++){ 
      SimpleIO.prompt("Enter the name for person "+ (i+1)+ ":"); 
      String name = SimpleIO.readLine(); 
      fbp[i] = new FacebookPerson_Graphics(name); 
     } 
     System.out.println("-------select a person and type the mood below--------"); 


     //Ask the user to set the mood for a person, and update the mood, enter "####" to exit 
     while(true){ 
      SimpleIO.prompt("Enter the name for a person (enter #### to exit):"); 
      String name = SimpleIO.readLine(); 
      if(name.equals("####")) 
       System.exit(0); 
      int personID = -1; 
      for(int i=0; i< numP; i++){ 
       if(fbp[i].getName().equals(name)){ 
        personID = i; 
        break; 
       } 
      } 
      if(personID!=-1){ // found the person 
       SimpleIO.prompt("Enter the mood for the person:"); 
       String mood = SimpleIO.readLine(); 
       fbp[personID].setMood(mood); 
      } 
      else 
       System.out.println("unrecognized name!"); 
     } // end while 

     } // end main 

    } 

Answer 1

您Facebook_Graphics類更改是這樣的：

public class Facebook_Graphics { 
    private String name; 
    private String content; 
    DrawableFrame df; 
    private Graphics g; 

    public Facebook_Graphics(String nm) { 
     content = "undefined"; 
     name = nm; 

     // Create drawable frame   
     df = new DrawableFrame(name); 
     df.show(); 
     df.setSize(200, 150); 

     // Obtain graphics context 
     g = df.getGraphicsContext(); 
     drawLayout(); 
     df.repaint(); 
    } 

    public void setContent(String newContent) { 
     content = newContent; 

     clearGraphics(); 
     drawLayout(); 

     // Repaint frame 
     df.repaint(); 
    } 
    private void clearGraphics() { 
     g.setColor(Color.WHITE); 
     g.fillRect(0, 0, 200, 150); 
    } 
    private void drawLayout() { 
     g.setColor(Color.BLACK); 
     g.drawString("Name", 20, 40); 
     g.drawString("Mood", 20, 90); 

     g.setColor(Color.GREEN); 
     g.fillRect(80, 20, 100, 30); 

     g.setColor(getMoodColor()); 
     g.fillRect(80, 70, 100, 30); 

     g.setColor(Color.BLACK); 
     g.drawString(name, 90, 40); 
     g.drawString(content, 90, 90); 
    } 

    private Color getMoodColor() { 
     return "happy".equals(content) ? Color.RED : Color.GRAY; 
    } 

    public String getContent() { 
     return content; 
    } 
}