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Java Java Basics Perfecting the Prototype String Equality

martin li
martin li
1,026 Points
Posted by martin li
martin li
1,026 Points

Question about the method calling

Yeah so I completed the assignment by using the 'not equal' operator and I feel like I have completed the assignment but didn't complete it by using the equalsIgnoreCase method and I want to know how I would complete the assignment doing that (see my attempt in the comments)

(Add another if statement that checks if the firstExample is equal ignoring case to thirdExample. If it, is print out "first and third are the same ignoring case".)

Equality.java 
// I have imported a java.io.Console for you, it is named console. 
String firstExample = "hello";
String secondExample = "hello"; 
String thirdExample = "HELLO";
if (firstExample == secondExample) {
  console.printf("first is equal to second");
}
if (firstExample != thirdExample) {
  console.printf("first and second are the same ignoring case");
}
/*
if (firstExample == thirdExample.equalsIgnoreCase("HELLO")){
  console.printf("first and third are the same ignoring case");
}*/

1 Answer

Rob Bridges
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Rob Bridges
Full Stack JavaScript Techdegree Graduate 35,467 Points
Rob Bridges
.a{fill-rule:evenodd;}techdegree seal-36
Rob Bridges
Full Stack JavaScript Techdegree Graduate 35,467 Points

Hey there Martin,

So there are two methods that Craig wanted us to call on these Strings.

The first one is equals() which is predefined in the String class and can be passed on any String object.

We use this one in the first test like so

if (firstExample.equals(secondExample)

This will check and see if they exactly equal.

If we wanted to get a little Picky, say we wanted the second Example to be "Hello" and we wanted to see how close it was to the first, we would pass

if(firstExample.equalsIgnoreCase(secondExample))

This will check and if each character is the same (capitalization not matterring) it will return true.

The equalsIgnoreCase() method is actually used pretty frequently on strings, especially when acceping input from the user. We don't want to force them type "Yes" when "yes" works just as well.

In fact you'll be using the equalsIgnoreCase() method later in this course.

Over all, I changed your code to 

String firstExample = "hello";
String secondExample = "hello"; 
String thirdExample = "HELLO";
if (firstExample.equals(secondExample)) {
  console.printf("first is equal to second");
}
if (firstExample.equalsIgnoreCase(secondExample)) {
  console.printf("first and second are the same ignoring case");
}

Thanks, let me know if this doesn't help.