2016-01-25 66 views
0

我想做一個程序,其中用戶可以輸入一個字符串,它將被轉換爲一個字符數組。該方案有三個功能:我無法確定在我的程序中的java.lang.ArrayIndexOutOfBoundsException的原因

  1. 的toString():返回char數組作爲字符串再次
  2. isFull():檢查該數組已滿
  3. 追加():允許用戶輸入另一個字符

我認爲我的代碼大部分都是正確的方式,但我似乎無法得到append()的工作。這裏是我的代碼:

import java.util.Arrays; 
import java.util.Scanner; 

public class CharSeq { 

private static Scanner sc = new Scanner(System.in); 
private static final int maxLength = 5; 
private static char[] cArray = new char[maxLength + 1]; 
private static String input; 
private static char append, yesNo; 
private static int cLength = 0; 

public static void main(String[] args) { 
    CharSeq cs = new CharSeq(); 

    System.out.println("Input sequence: "); 
    input = sc.next(); 
    cArray = input.toCharArray(); 
    cLength = cArray.length; 
    System.out.print(cs.toString()); 
    System.out.print(" (space left: " + (maxLength - cLength) + ")"); 
    cs.append(yesNo, append); 
    System.out.println(cs.toString()); 
} 

public String toString(){ 
    String s = ""; 
    for(int i = 0; i < cLength; i++){ 
     s = s + cArray[i]; 
    } 
    return s; 
} 

public boolean isFull(){ 
    if(cLength == maxLength){ 
     return true; 
    } 
    else{ 
     return false; 
    } 
} 

public void append(char a, char c){ 
    if(isFull()){ 
     System.out.println("\nCharSeq is full."); 
    } 
    else{ 
     System.out.println("\nDo you want to add sequence? [Y/N]"); 
     a = sc.next().charAt(0); 
     if(a == 'Y' || a == 'y'){ 
      System.out.println("Input sequence: (space left: " + (maxLength - cLength) + ")"); 
      c = sc.next().charAt(0); 
      cArray[++cLength] = c; 
     } 

    } 

} 

} 

這裏的堆棧跟蹤:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5 
at CharSeq.append(CharSeq.java:53) 
at CharSeq.main(CharSeq.java:22) 
+1

包括堆棧跟蹤,看看它異常報告。 – Alfabravo

+2

'cArray [++ cLength] = c;' – Satya

+1

堆棧跟蹤不僅顯示源中的確切位置,還顯示超出界限的索引值。對程序的簡短介紹通常足以查明原因。如果沒有,調試器就是你的朋友。 – Henry

回答

-1

指數從0開始,最大索引長度 - 1

相關問題