带有java容器的空白窗口

Question

我正在编写一个应用程序，该程序应该有一个窗口，其中包含容器内的所有组。当你点击开始按钮时，它应该打开另一个窗口，列出case2中列出的容器：在GlobalTeenagerProject类中。问题是，当你点击这个，它会弹出一个新窗口，但窗口是完全空白的。有谁知道它有什么问题吗？源代码是：

import java.awt.*; 
import java.awt.event.*; 
import java.awt.geom.*; 

public class GlobalTeenagerProject extends Frame implements ActionListener, ItemListener{ 

    private static final long serialVersionUID = 1L; 
    int ACTSATOp; 
    TextField ApNumberField=new TextField(20), 
      ApScoreField=new TextField(20), 
      ACTField=new TextField(20), 
      SATField=new TextField(20), 
      leadershipNumberField=new TextField(20), 
      leadershipHoursField=new TextField(20), 
      leadershipLengthField =new TextField(20), 
      serviceHoursField = new TextField(20), 
      GPAField = new TextField(20); 
    Label ApNumberLabel = new Label ("Please enter the number of AP tests you have taken"); 
    Label APScoreLabel = new Label ("Please input your first AP test score with no decimal point"); 
    Label leadershipNumberLabel = new Label ("Please input the number of Leadership positions you have held"); 
    Label serviceHoursLabel = new Label ("Please enter the number of community service hours you have done since starting high school"); 
    Label leadershipLengthLabel = new Label ("How long did you serve in your 1st leadership position"); 
    Label GPALabel = new Label ("What is your GPA?"); 

    Button submitButton = new Button ("Submit"); 
    Button getStartedButton = new Button ("Get Started"); 
    Button seeStatsButton = new Button("Compare yourself"); 
    Button goButton = new Button("Go"); 

    CheckboxGroup ACTSATgroup; 
    Checkbox ACTBox = new Checkbox ("ACT",false,ACTSATgroup); 
    Checkbox SATBox = new Checkbox("SAT", false, ACTSATgroup); 
    Checkbox hiddenBox = new Checkbox("",true,ACTSATgroup); 
    Checkbox bothBox = new Checkbox("Both", false, ACTSATgroup); 

    double ACT, SAT, serviceHours, leadershipNumber, LNumberLength, APLength, GPAnumber; 
    double leadershipLengthArray[], APTestNumber[], ApScore[]; 

    Button button[] = {submitButton, getStartedButton, seeStatsButton, goButton}; 
    Panel ACTSATpanel = new Panel(); 
    Panel GPAPanel = new Panel(); 
    Panel APpanel = new Panel(); 
    Panel servicePanel = new Panel(); 
    Panel leadershipPanel = new Panel(); 
    Panel buttonPanel = new Panel(); 
    Panel mainPanel = new Panel(); 

    int j=0; 

    public GlobalTeenagerProject(int type) { 
    switch(type){ 
     case 1: 
     this.setLayout(new BorderLayout()); 

     buttonPanel.setLayout(new GridLayout(2,1,10,10)); 
     add(buttonPanel,BorderLayout.CENTER); 

     buttonPanel.add(button[1]); 
     button[1].addActionListener(this); 

     buttonPanel.add(button[2]); 
     button[2].addActionListener(this); 
     addWindowListener(
      new WindowAdapter(){ 
      public void windowClosing(WindowEvent e){ 
       System.exit(0); 
      } 
      } 
     ); 
     break; 

     case 2: 
     this.setLayout(new GridLayout(6,1,10,10)); 
     ACTSATpanel.setLayout(new GridLayout(2,3,10,10)); 
     APpanel.setLayout(new GridLayout(2,2,10,10)); 
     servicePanel.setLayout(new GridLayout(5,2,10,10)); 
     leadershipPanel.setLayout(new GridLayout(1,2,10,10)); 
     GPAPanel.setLayout(new FlowLayout()); 
     buttonPanel.setLayout (new GridLayout (2,1,10,10)); 

     GPAPanel.add(GPALabel); 
     GPAPanel.add(GPAField); 
     ACTSATpanel.add(ACTBox); 
     ACTSATpanel.add(SATBox); 
     APpanel.add(ApNumberLabel); 
     APpanel.add(ApNumberField); 
     APpanel.add(APScoreLabel); 
     APpanel.add(ApScoreField); 

     servicePanel.add(serviceHoursLabel); 
     servicePanel.add(serviceHoursField); 

     leadershipPanel.add(leadershipNumberLabel); 
     leadershipPanel.add(leadershipNumberField); 
     leadershipPanel.add(goButton); 

     goButton.addActionListener(this); 
     buttonPanel.add(submitButton); 
     submitButton.addActionListener(this); 
     addWindowListener(
      new WindowAdapter(){ 
      public void windowClosing(WindowEvent e){ 
       System.exit(0); 
      } 
      } 
     ); 
     break; 

     case 3: 
     // put in graphing component 
     break; 
    } 
    } 

    public static void main(String[]args){ 
    GlobalTeenagerProject k = new GlobalTeenagerProject(1); 
    k.setVisible(true); 
    k.setBounds(200, 200, 600, 600); 
    k.setTitle("CollegeConnections"); 
    } 

    public void actionPerformed(ActionEvent e) { 
    if(e.getSource()== button[1]){ 
     GlobalTeenagerProject i = new GlobalTeenagerProject(2); 
     i.setVisible(true); 
     i.setBounds(200,200, 600, 600); 
    } 
    else{ 
     if(e.getSource()==button[0]){ 
     remove(GPAPanel); 
     remove(ACTSATpanel); 
     remove(APpanel); 
     remove(servicePanel); 
     remove(leadershipPanel); 

     buttonPanel.remove(submitButton); 
     this.setLayout(new BorderLayout()); 
     buttonPanel.setLayout(new GridLayout(2,1,10,10)); 
     buttonPanel.add(getStartedButton); 
     buttonPanel.add(seeStatsButton); 
     add(buttonPanel,BorderLayout.CENTER); 
     } 
     else{ 
     if(e.getSource()=="Submit"){ 
      GlobalTeenagerProject j= new GlobalTeenagerProject(3); 
      j.setVisible(true); 
      j.setBounds(200, 200, 600, 800); 
     } 
     else{ 
      if(e.getSource()==button [3]){ 
      int leadershipNumber = 0; 
      leadershipPanel.setLayout(null); 
      } 
     } 
     } 
    } 
    } 

    public void itemStateChanged(ItemEvent f) { 
    if (ACTBox.getState()){ 
     ACTSATOp = 1; 
     ACTSATpanel.add(ACTField); 
    } 
    else{ 
     if(SATBox.getState()){ 
     ACTSATOp =2; 
     ACTSATpanel.add(SATField); 
     } 
     else{ 
     if(bothBox.getState()){ 
      ACTSATOp =3; 
      ACTSATpanel.add(ACTField); 
      ACTSATpanel.add(SATField); 
     } 
     } 
    } 
    } 
} 

Answer 1

我想你忘了把你所有的面板加到你的框架上。尝试将此添加到您的代码：

this.add(ACTSATpanel); 
    this.add(APpanel); 
    this.add(servicePanel); 
    this.add(leadershipPanel); 
    this.add(GPAPanel); 
    this.add(buttonPanel); 

Answer 2

您是否试图调整窗口大小？如果组件在显示后重新调整大小，则意味着您必须在程序结束时调用方法WHATEVER_FRAME.repaint()（创建窗口时）。