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Check if a String is empty ("") or null in Java
To check if a string is null or empty in Java, use the == operator.
Let’s say we have the following strings.
String myStr1 = "Jack Sparrow"; String myStr2 = "";
Let us check both the strings now whether they are null or empty. Result will be a boolean.
res = (myStr1 == null || myStr1.length() == 0); res = (myStr2 == null || myStr2.length() == 0);
Example
public class Demo {
public static void main(String[] args) {
String myStr1 = "Jack Sparrow";
String myStr2 = "";
boolean res;
res = (myStr1 == null || myStr1.length() == 0);
System.out.println("String 1 is null or empty? "+res);
res = (myStr2 == null || myStr2.length() == 0);
System.out.println("String 2 is null or empty? "+res);
}
}Output
String 1 is null or empty? False String 2 is null or empty? True
Updated on 25-Jun-2020 11:42:02
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