javaで配列要素を追加するには？

Question

私の問題は：

配列の制限は25です。私はそれをどのように追加しますか？私はArrayListのinteger.parseInt、append、およびStringbuilderを使うべきではない。それはまたfileReading部分を持っています。

ファイルの内容は以下のようにフォーマットされています。以下は

28 6 
9 5 
2000 2001 
0 
1 23 4 

が予想される出力です：

28 + 6 = 34 
9 + 5 = 14 
2000 + 2001 = 4001 
0 = 0 
1 + 23 + 4 = 28 

私は助け要素を追加する必要があります。これまでのところ、私のコードです。

以下の最新のコメントをもとに

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

public class Sum { 
    public static final int arbitraryNum = 25; // class constant for setting constant values 

    // main method 
    public static void main(String[] args) throws FileNotFoundException { 
    fileProcessing(); // call the file reading method 
    } 

    //reads from a given file and then passes it to the next method. 
    public static void fileProcessing() throws FileNotFoundException{ 
    File reading = new File("sum.txt"); // file call 
    Scanner lineByLine = new Scanner(reading); // reads lines by line to count the total lines 
    Scanner wordByWord = new Scanner(reading); 
    Scanner console = new Scanner(reading); // total number of tokens 
    Scanner tokensInLine = new Scanner(reading); //number 
    int totalLines = 0; 
    int a = 0; 
    int b = 0; 
    int tokenCount = 0; 
    String lines = ""; 
    String words = ""; 
    String tokens =""; 
    String[] token; 
    String[] lineStore = null; 

    while(lineByLine.hasNextLine()){ 
     totalLines++; 
     lines = lineByLine.nextLine(); 
    } 

    lineStore = new String[totalLines]; 
    while(tokensInLine.hasNextLine()){ 
     tokens = tokensInLine.nextLine(); 
     totalLines++; 
     lineStore[b++] = tokens; 
    } 

    while(console.hasNext()){ 
     tokens = console.next(); 
     tokenCount++; 
    } 
    token = new String[tokenCount]; 
    while(wordByWord.hasNext()){ 
     words = wordByWord.next(); 
     token[a++] = words; 
    } 
    leadingZeros(token, lineStore); 
    System.out.println("Total lines = " + totalLines); 
    System.out.println("Token count = " + tokenCount); 
    } 
    // adds leading zeros. 
    public static String leadingZeros(String[] tokens, String[] Line){ 
    String[] number = tokens; 
    String s = ""; 
    for(int i = 0; i < tokens.length; i++){ 
     s= "0000000000000000000000000"+number[i]; 
     String[] hello = {s.substring(s.length()-25)} ; 
     StringToIntConversion(tokens, (s.substring(s.length()-25)), Line); 
     // System.out.println(s.substring(s.length()-25)); 
    } 
    return s; 
    } 

    //converts the string to integer meaning, string ====> char ====> int 
    public static int[] StringToIntConversion(String[] tokens, String num, String[] line) { 
    int[] a = new int[arbitraryNum]; 
    int sum = 0; 
    for(int v = 0; v < arbitraryNum; v++){ 
     a[v] = Character.getNumericValue(num.charAt(v)) ; 
     sum += a[v]; 
     //System.out.print(sum); 
    } 
    System.out.println(Arrays.toString(a)); // to show array structure 
    // 
    //int[][] add = new int[line.length][tokens.length]; 
    //for(int r = 0; r < add.length; r++){ 
    // for(int p = 0; p < add[0].length; p++){ 
    // for(int v = 0; v < arbitraryNum; v++){ 
    //  add[r][p] = Character.getNumericValue(num.charAt(v)); 
    //  System.out.print(add[r][p] + sum); 
    // } 
    // System.out.println(); 
    // } 
    //} 
    //    

    addition(a, tokens, line); 
    return a; 
    } 

    // adds data from the previous method 
    public static void addition(int[] kilo, String[] token, String[] lineStore){ 
    int sum = 0; 
    for(int a = 0; a < arbitraryNum; a++){ 
     //how should i add 
     enter code here 
    } 
    System.out.println(); 
    } 
} 

Answer 1

、あなたのために働くだろうが - などを確認し、私はエラーの世話をしていないことに注意してください

public static void fileProcessing() throws FileNotFoundException { 
     String reading = "28 6\n9 5\n2000 2001\n0\n1 23 4"; 
     Scanner lineByLine = new Scanner(reading); // reads lines by line to 
                // count the total lines 
     String lines = ""; 

     while (lineByLine.hasNextLine()) { 
      lines = lineByLine.nextLine(); 
      String[] nums = lines.split(" "); 
      StringBuilder sb = new StringBuilder(); 
      BigInteger sum = new BigInteger("0"); 
      for(String num : nums){ 
       sb.append("+").append(num); 
       sum = sum.add(new BigInteger(num)); 
      } 
      System.out.println(sb.toString().substring(1)+"="+sum); 
     } 
    }