Object variable might not have been initialized

Question

I cannot find the error that is being generated at right.GetText(); near the bottom. The error is the title above. From what i've read, member variables have to be initialized in Java, so I went throught and looked at all of those to no avail. I think i've done everything correctly in my default constructor, but I may be wrong, this my first java program. Thanks for the help, I just don't want to spend another hour on this.

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(); } } //}

Naftali · Accepted Answer · 2011-03-30 19:29:20Z

2

try this out in ur main fn:

Triangle right = new Triangle();

you have to initialize the Triangle

answered Mar 30, 2011 at 19:29

Naftali

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4 Comments

Naftali Over a year ago

lol ur question was not on C++ try my answer and then get back to me (and yes/no/sometimes -- depends on the situation)

ChadM Over a year ago

That's humiliating, I knew that

Naftali Over a year ago

lol. on stack you should pick one answer as accepted and more people would want to help on ur future questions ^_^

maaartinus Over a year ago

@ChadM Triangle right; right.getText(); in Java is just like Triangle* right; right->getText(); in C++ with the only difference that an uninitialized variable in Java gives compile time error.

MByD · Accepted Answer · 2011-03-30 19:30:53Z

Try this:

public static void main(String args[]) { Triangle right = new Triangle(); right.GetText(); right.GetRows(); right.ShowText(); right.ShowRowNum(); right.DisplayTriangle(); }

You tried to call right before it had anything in it, it was only declared.

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