打印我的方法的另一種方法？

Question

我的程序有效。我只是想知道是否有一種方法讓我通過實際返回一個字符串來打印我的表格，而不僅僅是使用System.out.print。 換句話說，我想知道如果不是返回null，我可以返回打印出我的表的字符串。

/** 
    * Print the magic square in table form. 
    */ 
public String toString() { 

    for (int row = 0; row < (magicSquare.length); row++) { 
     // row gets #row 
     System.out.print("\t"); 
     for (int column = 0; column < (magicSquare[row].length); column++) { 
      //column gets #column 
      System.out.print(magicSquare[row][column] + "\t"); 

      // when all column has been completed make new line 
      if (column == size - 1) { 
       System.out.print("\n"); 
      } 

     } 
     System.out.print("\n"); 

    } 

    return null; 
} 

Answer 1

簡短的回答是，你可以。長的答案將涉及的東西，如StringBuilder更換System.out.print語句，例如...

public String toString() { 

    StringBuilder sb = new StringBuilder(64); 

    for (int row = 0; row < (magicSquare.length); row++) { 
     // row gets #row 
     sb.append("\t"); 
     for (int column = 0; column < (magicSquare[row].length); column++) { 
      //column gets #column 
      sb.append(magicSquare[row][column] + "\t"); 

      // when all column has been completed make new line 
      if (column == size - 1) { 
       sb.append("\n"); 
      } 

     } 
     sb.append("\n"); 

    } 

    return sb.toString(); 
}