Given a string str, the task is to check if this string is empty or not, in Java. Examples:
Input: str = "" Output: True Input: str = "GFG" Output: False
Approach 1:
- Get the String to be checked in str
- We can simply check if the string is empty or not using the isEmpty() method of String class Syntax:
if (str.isEmpty())
- Print true if the above condition is true. Else print false.
Below is the implementation of the above approach:
Java
// Java Program to check if // the String is empty in Java class GFG {
// Function to check if the String is empty
public static boolean isStringEmpty(String str)
{
// check if the string is empty or not
// using the isEmpty() method
// and return the result
if (str.isEmpty())
return true ;
else
return false ;
}
// Driver code
public static void main(String[] args)
{
String str1 = "GeeksforGeeks";
String str2 = "";
System.out.println("Is string \"" + str1
+ "\" empty? "
+ isStringEmpty(str1));
System.out.println("Is string \"" + str2
+ "\" empty? "
+ isStringEmpty(str2));
}
} |
Output:
Is string "GeeksforGeeks" empty? false Is string "" empty? true
Approach 2: Using length() method
If the length of the string is zero then the string is empty.
Java
// Java Program to check if // the String is empty in Java class GFG{
public static void main(String[] args)
{
String str1 = "GeeksforGeeks" ;
String str2 = "" ;
boolean res1= false ;
boolean res2= false ;
if (str1.length()== 0 ){
res1= true ;
}
if (str2.length()== 0 ){
res2= true ;
}
System.out.println( "Is string \"" + str1+ "\" empty? " + res1);
System.out.println( "Is string \"" + str2+ "\" empty? " + res2);
}
} |
Output
Is string "GeeksforGeeks" empty? false Is string "" empty? true