文件I/O - Java的

Question

我目前正在寫一個小程序，這需要在文本從一個簡單的文件，並將其寫入到另一個文件。輸入文件有點像「madlibs」類型的交易，需要放置令牌，如「」和「」。

文本：

> One of the most <adjective> characters in fiction is named "Tarzan of the <plural-noun>." Tarzan was raised by a/an <noun> and lives in the <adjective> jungle in the heart of darkest <place>.

代碼：

import java.io.*; 
import java.util.*; 

public class Story { 

public static void main(String[] args) throws FileNotFoundException { 

    Scanner sc = new Scanner(System.in); 
    System.out.print("Input file name? "); 
    String infileName = sc.next(); 
    Scanner input = new Scanner(new File(infileName)); 

    System.out.print("Output file name? "); 
    String outfileName = sc.next(); 
    PrintStream out = new PrintStream(new File(outfileName)); 

    while (input.hasNext()){ 

     String current = input.next(); 
     System.out.println(current); 
     int openIndex = current.indexOf("<"); 
     int closeIndex = current.indexOf(">"); 
     current = current.substring(openIndex + 1, closeIndex - openIndex); 
     System.out.println(current); 

     if (current.equals("adjective")){ 
      System.out.print("Please enter an adjective: "); 
      current = sc.next(); 
      out.print(current); 
      out.print(" "); 
     } else if (current.equals("plural-noun")){ 
      System.out.print("Please enter a plural noun: "); 
      current = sc.next(); 
      out.print(current); 
      out.print(" "); 
     } else if (current.equals("noun")){ 
      System.out.print("Please enter a noun: "); 
      current = sc.next(); 
      out.print(current); 
      out.print(" "); 
     } else if (current.equals("place")){ 
      System.out.print("Please enter a place: "); 
      current = sc.next(); 
      out.print(current); 
      out.print(" "); 
     } else { 
      out.print(current); 
      out.print(" "); 
     } 
    } 
} 
} 

這是我似乎具有問題：用戶輸入只有即，正在被打印到「OUT1。 txt「或其他，並且每個單詞之間有一些空格。

任何幫助表示讚賞，感謝球員和女孩！

Answer 1

這個問題是正常的話，即這不是「<變量>」：

int openIndex = current.indexOf("<"); // returns -1 
int closeIndex = current.indexOf(">"); // returns -1 too 
current = current.substring(openIndex + 1, closeIndex - openIndex); 
// at this place for a normal word current is empty 

你必須添加一些「如果」

String current = input.next(); 
int openIndex = current.indexOf("<"); 
if(openIndex > -1) 
{ 
    int closeIndex = current.indexOf(">"); 
    current = current.substring(openIndex + 1, closeIndex - openIndex); 
} 
System.out.println(current); 

另一個問題帶有令牌[ 。「]（在[]內），您的代碼只能使用<>和。中的字符。」迷路了。

String current  = input.next(); 
String cstStrBefore = ""; 
String cstStrAfter = ""; 
int openIndex = current.indexOf("<"); 
boolean var = (openIndex > -1); 
if(var) 
{ 
    int closeIndex = current.indexOf(">"); 
    cstStrBefore = current.substring(0, openIndex); 
    cstStrAfter = current.substring(closeIndex + 1); 
    current  = current.substring(openIndex + 1, closeIndex - openIndex); 
} 

這裏是整個Java 7的代碼我使用：

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.PrintStream; 
import java.util.Scanner; 

public class Story { 
    public static void main(String[] args) throws FileNotFoundException { 
     Scanner  sc = new Scanner(System.in); 
     Scanner  input = new Scanner(new File("Story.txt")); 
     PrintStream out = new PrintStream("Story-out.txt"); 
     while(input.hasNext()) { 
     String current  = input.next(); 
     String cstStrBefore = ""; 
     String cstStrAfter = ""; 
     int openIndex = current.indexOf("<"); 
     boolean var = (openIndex > -1); 
     if(var) { 
      int closeIndex = current.indexOf(">"); 
      cstStrBefore = current.substring(0, openIndex); 
      cstStrAfter = current.substring(closeIndex + 1); 
      current  = 
       current.substring(openIndex + 1, closeIndex - openIndex); 
     } 
     System.out.println(current); 
     switch(current) { 
     case "adjective" : System.out.print("Please enter an adjective: "); break; 
     case "plural-noun": System.out.print("Please enter a plural noun: "); break; 
     case "noun"  : System.out.print("Please enter a noun: "); break; 
     case "place"  : System.out.print("Please enter a place: "); break; 
     } 
     if(var) { 
      current = sc.next(); 
     } 
     out.print(cstStrBefore + current + cstStrAfter + ' '); 
     } 
     sc.close(); 
     input.close(); 
     out.close(); 
    } 
} 

我建議你使用NetBeans或Eclipse來開發。

Answer 2

它也是很好的做法，關閉所有打開的流，他們已經使用了。 （儘管JVM可能注意到了這一問題）

out.close（）; input.close（）; sc.close（）;

您光顧{}