Java Does Not Equal (!=) Not Working?

Here is my code snippet:

public void joinRoom(String room) throws MulticasterJoinException {
String statusCheck = this.transmit("room", "join", room + "," + this.groupMax + "," + this.uniqueID);


if (statusCheck != "success") {
throw new MulticasterJoinException(statusCheck, this.PAppletRef);
}
}

However for some reason, if (statusCheck != "success") is returning false, and thereby throwing the MulticasterJoinException.

java

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小开

Please use !statusCheck.equals("success") instead of !=.

Here are more details.

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You need to use the method equals() when comparing a string, otherwise you're just comparing the object references to each other, so in your case you want:

if (!statusCheck.equals("success")) {

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最佳答案

if (!"success".equals(statusCheck))

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== and != work on object identity. While the two Strings have the same value, they are actually two different objects.

use !"success".equals(statusCheck) instead.

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do the one of these.

   if(!statusCheck.equals("success"))
{
//do something
}


or


if(!"success".equals(statusCheck))
{
//do something
}

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Sure, you can use equals if you want to go along with the crowd, but if you really want to amaze your fellow programmers check for inequality like this:

if ("success" != statusCheck.intern())

intern method is part of standard Java String API.

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you can use equals() method to statisfy your demands. == in java programming language has a different meaning!