A string and substring problem

[calnastic]

Hi, I wrote a piece of code, which reads from a file line by line. I was trying to determine content of each line by comparing substring to a keyword. However, the comparison at line 79 never returns true (the output command at line 80 was never executed), although the output at line 77 gives exactly the same keyword. I'm confused. Any advice is appreciated.

			while ( (inputLine = in.readLine()) != null ){
				substr = inputLine.trim();
				if(substr.length()> 9){
					System.out.println(substr.substring(1, 9));	  // line 77				

					if(substr.substring(1, 9)=="nodeName"){      // line 79
							System.out.println("node");	  // line 80				
					}
				}
				
			}

Output:

ar miser
nodeName
nodeName
nodeName
nodeName
nodeName
nodeName
nodeName
source:1
source:1
source:1
source:2
source:1
source:5
source:6

[Norm]

You need to use the equals() method when comparing Strings. The == operator is for primitives.

[kalyankasyapcse]

u need to override equals() method in ur class

So that those STRING objects can be compared via equals()

[Norm]

u need to override equals() method in ur class

Why? This is nonsense. There is no need for the OP to write an equals() method.

[calnastic]

Thanks guys. That makes sense.