Insert != null check issues

I am making something that turns a string into an Integer if it is an Integer, or keeps it as a String if it is a String. I have that bit working fine, it is just when I try and check to see what the String is (if it is a string) I get Eclipse saying I have to insert != null because I am converting a boolean into a string. The thing is, if I click on it, it just makes more errors.

Here is my code:

Code :

---

import java.io.*;
 
 
public class gplReader {
 
	//Class variables
	files f = new files();
 
	//General Variables
	boolean nextIsInt;
 
	public gplReader(){
 
	}
 
	public void startRead(String name) throws IOException{
		try{
			System.out.println("Reading File");
			String[] aryLines = f.readFileData("gpl/" + name);
 
			System.out.println("Reading Data");
			int i;
 
			for(i=0; i<aryLines.length; i++){
				System.out.println("Printing line" + " " + (i+1) + " ");
				System.out.println(aryLines[i]);
				System.out.println("Interpreting line" + " " + (i+1) + "");
				interpretGpl(aryLines[i]);
			}
		} finally {
			System.out.println("\nFinished Printing Lines\n");
		}
	}
 
	public void interpretGpl(String aryLines){
 
		String line = aryLines;
		String[] tempString = null;
		int[] tempInt = null;
		int i = 0;
		boolean isInt;
		boolean storeValue = false;
 
		try{
			Integer.parseInt(line);
			System.out.println("Line is Integer" + "\n");
			isInt = true;
			if(isInt != false){
				tempInt[i] = Integer.parseInt(line);
			}
 
		} catch (Exception ex){
			System.out.println("Line isn't an Integer" + "\n");
			isInt = false;
			if(isInt != true){
				tempString[i] = line;
			}
		}
 
		if(isInt != true){
			if(tempString[i] != null){
				----if(tempString[0] = "printf"){----
 
				}
			}
		}
 
	}
 
}

---

The line of code surrounded by ---- is the bit that is throwing up errors.

Hope you can help.

Hello JamEngulfer221!

Code java:

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if(tempString[0] = "printf")

---

The above statement is an assignment; you assign "printf" to tempString[0]. I think that instead of this assignment you want to compare them. Therefore you need to use the String's equals() method (instead of the == operator), since they are Strings.
Hope it helps.

No... No... There's no way I could have done that... Wow. I can't believe the absolute stupidity of what I did. I just can't believe it. Well, great. Thanks for the help though!

Don't feel that way, evereybody is making that kind of errors at times.
And something else I noticed.
You should initialize an array before you try to assign a value to an index of it otherwise a NullPointerException will be thrown.