[英]Java variables !does initialize
Code that should initialize variables a,b,c and d, !does initializes 应该初始化变量a,b,c和d的代码!
public class BufferedReaderFromUserAnd
{
private static final String FILENAME = "F:/Android.txt";
public static void main(String args[]) throws IOException
{
BufferedWriter bw = null;
FileWriter fw = null;
try
{
fw = new FileWriter(FILENAME);
bw = new BufferedWriter(fw);
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Word1: ");
String Word1 = reader.readLine();
System.out.print("Word2: ");
String Word2 = reader.readLine();
System.out.print("Word3: ");
String Word3 = reader.readLine();
System.out.print("Word4: ");
String Word4 = reader.readLine();
System.out.print("Y: ");
String y = reader.readLine();
String a = reader.readLine();
String b = reader.readLine();
String c = reader.readLine();
String d = reader.readLine();
if(y.compareTo(a)==0)
{
b = "not" ;
c = "not" ;
d = "not" ;
}
if(y.compareTo(B)/>/>/>==0)
{
a = "not" ;
c = "not" ;
d = "not" ;
}
if(y.compareTo(c)==0)
{
b = "not" ;
a = "not" ;
d = "not" ;
}
if(y.compareTo(d)==0)
{
a = "not" ;
c = "not" ;
d = "not" ;
}
String n = reader.readLine();
bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word1 + " which is " + a + " the correct answer' />(a) " + Word1 + "<br/>");
bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word2 + " which is " + b + " the correct answer' />(a) " + Word2 + "<br/>");
bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word3 + " which is " + c + " the correct answer' />(a) " + Word3 + "<br/>");
bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word4 + " which is " + d + " the correct answer' />(a) " + Word4 + "<br/>");
}
catch (IOException e) {
e.printStackTrace();
}
finally
{
try {
if (bw != null)
bw.close();
if (fw != null)
fw.close();
}
catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
when a is entered at prompt the result is 在提示符下输入a时,结果为
input type='radio' name='rbnNumber' value='You selected (a) Android which is the correct answer' />(a) Android 输入type ='radio'name ='rbnNumber'value ='您选择了(a)正确答案的Android'/>(a)Android
input type='radio' name='rbnNumber' value='You selected (a) CS which is the correct answer' />(a) CS 输入类型=“无线电”名称=“ rbnNumber”值=“您选择了(a)正确答案的CS” />(a)CS
input type='radio' name='rbnNumber' value='You selected (a) OS which is the correct answer' />(a) OS 输入类型='无线电'名称='rbnNumber'值='您选择了(a)正确答案的操作系统'/>(a)操作系统
input type='radio' name='rbnNumber' value='You selected (a) Code which is the correct answer' />(a) Code 输入类型=“无线电”名称=“ rbnNumber”值=“您选择了(a)正确答案的代码” />(a)代码The variables should initialize dynamically and the result espected is 变量应动态初始化,预期结果为
input type='radio' name='rbnNumber' value='You selected (a) Android which is the correct answer' />(a) Android 输入type ='radio'name ='rbnNumber'value ='您选择了(a)正确答案的Android'/>(a)Android
input type='radio' name='rbnNumber' value='You selected (a) CS which is not the correct answer' />(a) CS 输入类型=“无线电”名称=“ rbnNumber”值=“您选择了(a)不是正确答案的CS'/>(a)CS
input type='radio' name='rbnNumber' value='You selected (a) OS which is not the correct answer' />(a) OS 输入类型=“无线电”名称=“ rbnNumber”值=“您选择的(a)操作系统不是正确的答案” />(a)操作系统
input type='radio' name='rbnNumber' value='You selected (a) Code which is not the correct answer' />(a) Code 输入类型=“无线电”名称=“ rbnNumber”值=“您选择了(a)答案不正确的代码” />(a)代码
I've refracted and simplified your code and fixed the problem for you. 我修改并简化了您的代码,并为您解决了该问题。 Basically, if you are just reading and writing lines, you should consider using Scanner/PrintStream instead of Reader/Writer, since they are more convenient. 基本上,如果您只是在读取和写入行,则应考虑使用Scanner / PrintStream而不是Reader / Writer,因为它们更加方便。 Also, when you find yourself repeating code, you should move it into a separate method and then call that method with different arguments. 另外,当发现自己在重复代码时,应将其移至单独的方法中,然后使用不同的参数调用该方法。
public class ReadOptionsFromUser {
private static final Scanner INPUT = new Scanner(System.in);
private static final String FILENAME = "F:/Android.txt";
public static void main(String[] args) throws FileNotFoundException {
try (PrintStream output = new PrintStream(FILENAME)) {
readFromUser(output);
}
}
public static void readFromUser(PrintStream output) {
String wordA = readLine("Word (a)");
String wordB = readLine("Word (b)");
String wordC = readLine("Word (c)");
String wordD = readLine("Word (d)");
String answer = readLine("Correct letter");
output.println(radio("a", wordA, answer));
output.println(radio("b", wordB, answer));
output.println(radio("c", wordC, answer));
output.println(radio("d", wordD, answer));
}
private static String readLine(String prompt) {
System.out.print(prompt + ": ");
return INPUT.nextLine();
}
private static String radio(String letter, String word, String answer) {
String option = "(" + letter + ") " + word;
String is = letter.equals(answer) ? "is" : "is not";
return "<input type='radio' name='rbnNumber' value='You selected "
+ option + " which " + is + " the correct answer' />"
+ option + "<br/>";
}
}
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