Java/Android: String comparison s1==s2 does not work
Question by Guest | Last update on 2022-04-18 | Created on 2013-09-16
I am trying to compare two strings with each other using the operator "==" in Java for Android. I have the following code:
String s1 = new String("abc");
String s2 = new String("abc");
if (s1 == s2) {
// the same?!
} else {
// not the same?!
}I do not know why, but this condition always returns "false" independent from whether s1 and s2 are equal or not.
What is my mistake here? In all other programming languages I know and I am familiar to, it is working exactly like that.
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In Java/Android, a string is an object. When using the operator "==", Java is checking whether the two objects are identical and not whether their content is identical. Because in your example, the objects "s1" and "s2" are not identical, the if-condition always returns "false".
In order to compare the content of two strings, you can use the method .equals(Object obj) for your comparison:
String s1 = new String("abc"); String s2 = new String("abc"); String s3 = s1; if (s1.equals(s2)) { } // true if (s1 == s2) { } // false if (s1 == s3) { } // trueAdditionally, in this example, I have declared the String s3 and set it to s1. In this case, actually, the objects s1 and s3 are identical so that the condition with "==" will be "true" here.
Last update on 2022-04-18 | Created on 2013-09-16