對象變量可能尚未初始化

Question

我找不到在right.GetText產生（）的錯誤;靠近底部。錯誤是上面的標題。從我讀到的，成員變量必須用Java初始化，所以我經歷了所有這些都無濟於事。我想我已經在我的默認構造函數中正確地做了所有事情，但我可能是錯的，這是我的第一個Java程序。感謝您的幫助，我只是不想再花一個小時。

import java.io.*; 
import java.lang.*; 

//class Shapes 
//{ 
    class Triangle 
    { 
     private int rowNum; 
     private String text; 

     Triangle() { 
      rowNum=0; 
      text=""; 
     } 

     public void GetText() 
     { 
      int flag=0; 
      String trialText=""; 

      while(flag==0){ 
       BufferedReader reader= new BufferedReader(new InputStreamReader(System.in)); 

       System.out.println("\nPlease enter a word to display in the triangle(ie bob, tom, etc.)"); 

       try{ 
        trialText = reader.readLine(); 
        System.out.println("Your entered "+ trialText); //print the data entered by the user 
       } 
       catch (IOException ioe){ //statement to execute if an input/output exception occurs 
        System.out.println("An unexpected error occured."); 
        continue; 
       } 

       char[] newText=trialText.toCharArray(); 

       for(int i=0;i<trialText.length();i++){ 
        if(!Character.isLetter(newText[i])){ 
         System.out.println(newText[i]+"is not a letter, please enter a real word."); 
         flag=0; 
         break; 
        } 

       flag=1; 
       } 

      }//While(flag==0) 
      text=trialText; 
      text=text.toLowerCase();  //Converting all input text to Lower Case 
     } 

     public void ShowText() 
     { 
      System.out.println(text); 
     } 

     public void ShowRowNum() 
     { 
      System.out.println(rowNum); 
     } 
     /* 
     public boolean testText(String new_Text) 
     { 
      try{ 
       String trialText = new_Text; 
       System.out.println("You entered "+trialText); //print the data entered by the user 
      } 
      catch (IOException ioe){ //statement to execute if an input/output exception occurs 
       System.out.println("An unexpected error occured."); 
       return false; 
      } 
      return true; 

     } 
     */ 
     public boolean testRowNum(String new_Text) 
     { 
      try{ 
       Integer.parseInt(new_Text); 
       System.out.println("You entered "+ new_Text); //print the data entered by the user 
      } 
      catch (NumberFormatException nfe){ //statement to execute if an input/output exception occurs 
       System.out.println("You have entered a non-integer. "); 
       return false; 
      } 
      return true; 
     } 
     public void GetRows() 
     { 
      System.out.println("Please enter the number of rows the triangle will contain"); 

      BufferedReader newRow= new BufferedReader(new InputStreamReader(System.in)); 
      try{ 
       if(testRowNum(newRow.readLine().trim())==true) 
        rowNum=Integer.parseInt(newRow.readLine().trim()); 
      } 
      catch (IOException ioe) {//statement to execute if an input/output exception occurs 
      System.out.println("You have entered a non-integer. "); 
      } 
     } 

     public void DisplayTriangle() 
     { 
      int numSpaces=0; 
      String spaces=""; 
      String bricks=""; 

      for(int i=0; i<rowNum; i++){ 
       if(rowNum%2==0) 
        numSpaces=(rowNum/2); 
       else if(rowNum%2==1) 
        numSpaces=((rowNum/2)-1); 
       for(int j=numSpaces; j>0; j--){ 
        spaces=spaces+" "; 
       } 

       for(int k=0; k<rowNum; k++){ 
        bricks=bricks+"="; 
       } 

       System.out.println(spaces+bricks); 
      } 
     } 

     public static void main(String args[]) 
     { 
      Triangle right; 

      right.GetText(); 
      right.GetRows(); 
      right.ShowText(); 
      right.ShowRowNum(); 
      right.DisplayTriangle(); 
     } 
    } 
//} 

Answer 1

在烏拉圭回合主FN嘗試了這一點：

Triangle right = new Triangle(); 

你必須初始化Triangle

Answer 2

試試這個：

public static void main(String args[]) 
     { 
      Triangle right = new Triangle(); 

      right.GetText(); 
      right.GetRows(); 
      right.ShowText(); 
      right.ShowRowNum(); 
      right.DisplayTriangle(); 
     } 

嘗試調用right它收到任何東西，它只是宣佈。