check string is empty in java code example
Example 1: check if string is null or empty java
if(str != null && !str.isEmpty()) { }
Example 2: java string is null or empty
public class Null {
public static boolean isNullOrEmpty(String str) {
if(str != null && !str.isEmpty())
return false;
return true;
}
}
Example 3: how to check null and empty string in java
if(str != null && !str.isEmpty())
Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Example 4: check if a string is empty java
if (myString == null || myString.equals(""))
throw new IllegalArgumentException("empty string");