祝大家好日子！我正在创建一个quizzer，我的代码中有一些问题。如何在txtfile中显示JLabel中的问题？请检查我的代码..
这是我的代码：
package splashdemo;
import java.io.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class quiz extends JFrame implements ActionListener{
private int[] aNumbers=new int[100];
private String[] logicQ=new String[50];
private String[] logicA=new String[50];
private String[] logicB=new String[50];
private String[] logicC=new String[50];
private String[] logicD=new String[50];
private char[] logicAns=new char[50];
private char strAns;
private char cAns;
private int score=0;
public Scanner den= new Scanner(System.in);
public JLabel no= new JLabel();
public JLabel q= new JLabel();
public JLabel q1= new JLabel();
public JLabel q2= new JLabel();
public JLabel q3= new JLabel();
public JLabel q4= new JLabel();
//public JLabel a= new JLabel();
JTextField ans=new JTextField(12);
JButton button= new JButton("Continue");
public Container con= getContentPane();
public quiz(){
super("Quiz");
con.setVisible(true);
logicReader();
}
public static void main(String[] args){
}
public void logicReader(){
//con x=new con();
File oFile=new File("C:\\Users\\NEO\\Documents\\NetBeansProjects\\SplashDemo\\logic.txt");
FileInputStream fis=null;
BufferedInputStream bis=null;
DataInputStream dis=null;
score=0;
int iIndex=0;
String strTemp;
try{
fis=new FileInputStream(oFile);
bis=new BufferedInputStream(fis);
dis=new DataInputStream(bis);
while(dis.available()!=0){
logicQ[iIndex]=dis.readLine();
logicA[iIndex]=dis.readLine();
logicB[iIndex]=dis.readLine();
logicC[iIndex]=dis.readLine();
logicD[iIndex]=dis.readLine();
strTemp=dis.readLine();
logicAns[iIndex]=strTemp.charAt(0);
iIndex++;
}
boolean blnFound=false;
int iSlot=0;
for(int g=0; g<=99; g++)
aNumbers[g]=Generator(4);
int[] aUnique=new int[100];
for(int a=0; a<aNumbers.length; a++){
blnFound=false;
if(a==0){
aUnique[iSlot]=aNumbers[a];iSlot++;
} else {
for(int b=0; b<iSlot ;b++){
if(aNumbers[a]==aUnique[b]){
blnFound=true; break;
}
}
if(blnFound==false){
aUnique[iSlot]=aNumbers[a]; iSlot++;
}
}
}
JOptionPane.showMessageDialog(null,"\t\tYou have chosen to take the Quiz");
for(int a=0; a<=4; a++){
int iIdx=aUnique[a];
//System.out.print("\t\t"+(a+1) + ". " + logicQ[iIdx] + "\n" + logicA[iIdx] + "\n" + logicB[iIdx] + "\n" + logicC[iIdx] + "\n" + logicD[iIdx] + "\nAnswer:");
//strAns=den.nextLine();
no.setText(Integer.toString(a+1));
q.setText(logicQ[iIdx]);
con.add(q);
q1.setText(logicA[iIdx]);
con.add(q1);
q2.setText(logicB[iIdx]);
con.add(q2);
q3.setText(logicC[iIdx]);
con.add(q3);
q4.setText(logicD[iIdx]);
con.add(q4);
con.add(ans);
con.add(button);
button.addActionListener(this);
ans.addActionListener(this);
strAns=logicAns[iIdx];
con.setLayout(new FlowLayout());
con.setVisible(true);
//cAns=strAns.charAt(0);
/*if(logicAns[iIdx]==Character.toUpperCase(cAns)){
score++;
Display("Correct You are qualified to the next round!");
Display("Your Score is: "+score+"/15");
if(a==14){
Display("\t\t\tCongratulations!! You earn 100,000.00\n\t\t\tYou got a Perfect Score!!");
}
}else{
Display("Sorry! YOu have inputted a Wrong Answer!");
System.out.println("The correct answer is: "+logicAns[iIdx]);
break;
}*/
}
fis.close();
bis.close();
dis.close();
}catch(FileNotFoundException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
}
public void actionPerformed(ActionEvent c){
String name= ans.getText();
cAns= name.charAt(0);
q.removeAll();
q1.removeAll();
q2.removeAll();
q3.removeAll();
q4.removeAll();
//String greet="Hello, "+name;
//question.setText("Thank YOU");
//p.setText("Done");
if(strAns==Character.toUpperCase(cAns)){
score++;
q.setText("Your answer is correct!");
}else{
//Display("Sorry! YOu have inputted a Wrong Answer!");
//System.out.println("The correct answer is: "+logicAns[iIdx]);
//break;
}
//NewJFrame j= new NewJFrame();
//j.setVisible(true);
}
public static int Generator(int iNum){
int iRandomnum=(int) (iNum * Math.random())+1;
return iRandomnum;
}
public static void Display(String Mes){
System.out.println(Mes);
}
public static void Display(int Mes){
System.out.println(Mes);
}
}
先谢谢!!!!
答案 0 :(得分：1)
你正在调用错误的setVisible（true）方法。默认情况下，内容窗格容器始终可见，您需要使JFrame可见。
而不是
con.setVisible(true);
你想要
this.setVisible(true);
因为“this”指的是你从未设置过的JFrame。然后，内容窗格将自动显示。
此外，您应该了解JFrame的一些标准操作：
JFrame.setSize(width, height);
//sets the size of the window in pixels
JFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//turns on window closing via the "x"
这肯定会让你的测验窗口显示出来。看起来你已经正确添加了JLabel，所以这些也会出现。但你真的应该做评论推荐的内容并制作单独的类，因为这个类太大而且太复杂了。它试图处理JFrame，JPanels，JLabels，问题/答案，事件，甚至文件输入！难怪你感到困惑！
有关制作JFrame的更多信息，请访问
http://download.oracle.com/javase/tutorial/uiswing/components/frame.html